I have a catchment of 23000.km2. However, the climate engine is unable to dowload time series data for the 40 years in chirps.pls is this a limitation of the application? Pls how can I unravel this puzzle?
There is a limitation imposed by Google Earth Engine on the maximum number of data points. What you need to do is to download the data in smaller chunks - for example in sections of 5 or 10 years. All the best, Andreas
Thank you, Andreas. I stumbled across your channel and I made sure I subscribed. A wonderful job is an understatement, You have done an exceptional job. And your Excel templates are just mind-blowing. I really appreciate your effort. Can you make a video on how to get catchment run-off data and also how to calculate catchment level water balance? Thank you
Thanks and welcome Onipe! Yes, I'm planning new videos in the series on Water Balance of River Basins (th-cam.com/play/PLp1lK6n-xb5MPuDmzx3xJK8RKKdFtQbMD.html) which are all about trying to get a reliable water balance using free online data. Getting runoff is a challenge, and basically you need to have some real data from key locations, so that you can use that to extrapolate to un-gauged catchments. I have had some success in Vietnam using 2000-2020 average CHIRPS precipitation less MODIS evaporation to get the long-term average surplus water, which correlated very well with average measured runoff. If you use long term averages, then storage is less important - a kind of steady state. We can estimate lake/reservoir volumes using the water area and the rating curve - am planning a video on that as well. Finally all this comes together in a simple A4 spreadsheet where we stick in all the inputs and outputs to the water balance, including water demand for irrigation, urban water supply, environmental needs etc. Anyway - lots of little videos coming up, but it takes time... All the best, Andreas
Hi Onipe, I have not yet tried GRDC, just the FLDAS runoff. It gives a good overview, but is probably better for regional studies. All the best, Andreas
You are welcome Abdul Wahed! What I have noticed is that CHIRPS seems to be less accurate near the sea, but to do any kind of correction you also need good data to correct it to. As far as I understand the S in CHIRPS stands for station data, so it should already be corrected to some extent. Of course it depends on how many stations they use. All the best, Andreas
for those that will find it difficult to get their shapefiles accepted by the websites need not to worry, you could just use the Globe earth viewer window by the side and zoom to the area of your interest, and then use the rectangle tool to draw a rectangle over the proposed area, so the system could register your proposed study area
Hi Okon, The purpose of using a polygon as the "cookie cutter' is to get the exact precipitation over the catchment area. This data will be used later to compare with e.g. evapotranspiration data to work out a water balance. Drawing an approximate rectangle is not recommended. If you are having problems with your shape file it is because there are errors in it. Please have a look at minute 03:47 Step 2: Check Vector Geometry in the video on how to fix this problem. All the best, Andreas
Thank you for the wonderful instruction. May you suggest how to download the data for a large number of polygon. In my case, I need to extract data for all the district in Vietnam (about thousands districts). Thank you!
You are welcome Shikalichinh. With the ClimateEngine you can just download the data for one polygon at a time. If you need daily rainfall it is better if you use Google Earth Engine to extract the data. If you just want annual data, or the mean monthly data you could make a raster in ClimateEngine and then use QGIS to extract the data for each district. I did a project in Vietnam recently and the CHIRPS data was very good inland, but underestimated precipitation near the coast. Something to do with the cyclones. Near the coast GPM_3IMERGDF_06 is better. You can get it from Giovanni giovanni.gsfc.nasa.gov/giovanni/ as a raster. Always check the satellite data against ground data. Sometimes it can be problematic - especially near the coast or in the mountains. Good luck & all the best, Andreas
This is one of the best video I have seen recently.I thank you for sharing it.I tried loading shapefile from SWAT ArcGIS but it didn't yield positive result. Must I delineate catchment in qgis to get it right.
Hi Imuwahen, firstly thanks so much for your kind words! Any shape file is fine but you need to check the validity of your vector geometry. I'm sure that you can do it in ArcGIS. The problem is that programs like SWAT sometimes produce triangular holes in the polygon, often at the edges. They can be very small so you need to find them with your GIS program & then edit them out. What you need is a clean polygon without any holes, or programs like Climate Engine will get confused. Good luck & all the best, Andreas
Hi, Sir this video you made makes my life easy on accessing the Precipitation data I was looking for, thank you so much, I only have one question. the areal mean rainfall data we get for a catchment, is it calculated based on the arithmetic mean or Theissen polygon or any other methods such as coding? Mulugeta.
You are most welcome Mulugeta! The mean is calculated from all the pixels inside your catchment polygon. Each one is about 10x10 km in size, so basically it is a grid or raster of cells, and we take the average of them all. CHIRPS is quite good at measuring precipitation, but I have had problems in coastal areas and apparently there could also be issues in mountainous areas. It would be good if you compare the CHIRPS precipitation at some point locations where you have station data. The approach in the video is for areas, but you can also chose points. Good luck & all the best, Andreas
Hi Siaka, What analysis steps you do depends on what you are looking for in the data. Have a look at this video: th-cam.com/video/KdPht_4F-M0/w-d-xo.html All the best, Andreas
Hi Valery, I have put all the important links in the description below the video. e.g. link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p All the best, Andreas
thanks for the video. it is very helpful for me. can you share a video to get the daily streamflow data? i tried GRDC, but it doesn't have the river i'm looking for. so is there any way to have the streamflow data any of the river of the world?
GRDC is probably the best database of flows, so if they don't have it you need to look for the flows using local sources. An alternative is to use radar altimetry, but to convert that into flows you will need the rating curves. Have a look at: hydroweb.theia-land.fr/?lang=en& All the best, Andreas
Hi Gustavo, yes you can download the data as maps, which is a separate option from the time series. Chose Make Map - top left of the screen. All the best, Andreas
Andréas, thank you very much for your response. I have another question: I need to analyze a long period (30 years), could you tell me if I need to download a raster for each year and merge them later or could I download just one raster from this period? If it is the first option, how can I combine them in GIS? Thanks a lot for the help.
Hi Gustavo, If you want to get the average annual CHIRPS precipitation grid, you should download the total precipitation for each year and then calculate the average annual precipitation for all grids. You can do this in QGIS using the Raster Calculator. At this level of processing, it is probably quicker to use the Google Earth Engine. One thing you need to be careful about is if your project area contains any coastal or mountainous regions as sometimes CHIRPS is less accurate there. Always compare station data with CHIRPS, and also have a look at GPM precipitation - you can get the grid using Giovanni (giovanni.gsfc.nasa.gov/). All the best, Andreas
You are most welcome Biemba! Please always compare the CHIRPS data with ground stations. Over longer time periods (months/quaters/years) it should be comparable, though I have had problems in coastal areas & mountainous areas. Let me know how it goes & all the best, Andreas
Hi I did everything for Sava river basin which is located in western Balkans and the only thing I find confusing is pick the region thing. Suddenly i get 10 regions all with different values. What should I do?
The shape file you are using probably consists of 10 different polygons. Check it in your GIS and see which one is the correct one to use. To avoid confusion it is better to have a single polygon for your catchment. All the best, Andreas
Really great! I've worked with CHIRPS before, and it is very good for places where there's no precipitation records. I was wondering, is there any way to get sub hourly precipitation data as good as CHIRPS?? CHIRPS is great, but for small watersheds a day-time period is not appropriate, especially if you want to take into account floods, that in small watersheds, with a small time of concentration happen in less than a day. Or do you know about a software to disaggregate daily precipitation into hourly?
You are right, the daily data is only good for water balances & I usually average it to monthly time steps. By then it usually gets quite close to data from ground stations. I am also looking for an easy way to get sub-hour data that does not involve knowledge of advanced python/Jupyter Notebooks. At the moment the best one I know of is GPM IMERG Final Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V06 (GPM_3IMERGHH). You can have a look at the details at: disc.gsfc.nasa.gov/datasets/GPM_3IMERGHH_06/summary In giovanni.gsfc.nasa.gov/giovanni/ just search for IMERGHH. You can get Time Series - Area Averaged data, but the problem is the cookie cutter. They only let you select the major river basins or countries. You can draw a rectangular bounding box, but you cannot upload a catchment... That's why I don't use Giovanni, except for making grids for precipitation maps. I guess you could use it to get the accumulated precipitation grid that fell over a certain number of hours on a particular day. Let me know if you find an easy solution & all the best, Andreas
Hi, thank you very much for this video. I was able to download the CHIRPS data for my catchment areas. However during the process, in the Pick as Region option, the data displayed was “1” although I edited the attribute table. Would that affect my downloaded data? Like, will it give me the wrong data? Thank you very much
Hi Jhunas, You will always need to chose the region even if the polygon is a single region. When you load the polygon you will see the extent on the satellite image. That is a good control on if you have loaded the correct polygon. All the best, Andreas
Hi Aysuf, You need to upload the shape file into Google Earth Engine. See: th-cam.com/video/TPSN71KuOUM/w-d-xo.html However, please make sure that you check the vector geometry. th-cam.com/video/TPSN71KuOUM/w-d-xo.html If there are errors in the catchment shape file (like holes) it may not work. In the description below the video you can also find links to other resources. Good luck and all the best, Andreas
Hi Abdi Guta, select Remote Sensing under the variable type and have a look at the options. I think you can get Land Surface Temperature from Landsat 5/7/8/9 - 30m resolution since 1984, but there are also others. Have a look at th-cam.com/video/KdPht_4F-M0/w-d-xo.html for ideas on how to process it in Excel. All the best, Andreas
Hi, nice tutorial. Just wondering though, why did you have to go through the trouble of using google earth engine at all? since climate engine provides the option to directly specify a shapefile., so why would you pick the table asset path?
Hi @r2ishara, when I made this CHIRPS video I did not see the shape file option, so I assume that it was added later. At that time I also made a video about MODIS evapotranspiration using AppEEARS where you can upload a shape file of the catchment. I also made some videos on how to make the catchment shape file in QGIS. All this was part of getting the water balance for catchments. All the best, Andreas
Hi Arthur, Glad it is useful for your work. I have put all the important links in the description below the video. e.g. link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p All the best, Andreas
Sir, When I am trying to paste the path to an Earth Engine Table Asset. It is showing me "Asset loading failed: path invalid." As I Have been working on Bhadra Dam, the rest of the steps is done correctly. What do you think I should do?
Hi Kanishk, in GEE next to your uploaded asset there is a share icon. Make sure that everyone can read is selected. If that does not work, then you need to check your polygon in QGIS to make sure that it is valid ie no holes. Vector | Geometry Tools | Check Geometry Validity. All the best, Andreas
Hi Tebogo, That's an interesting question & useful if we want to compare the satellite data with ground measurements. I have tried to get CHIRPS precipitation in Climate Engine. It only allows 5 individual points and they need to be entered manually. After that it failed to process, as it said that was too much work for the Google Servers. I deleted each point & finally managed to get CHIRPS data for a single location. Getting temperature and evapotranspiration data (PET & ET) via AppEEARS worked very easily and you just need to upload a CSV file with the coordinates. In conclusion, it is possible but cumbersome to get the CHIRPS precipitation data via the Climate Engine, and you probably have to do one station at a time. Of course it is possible to get the whole lot via Google Earth Engine, but I'm trying to find tools which can be used easily by any scientist - not just the programmers. So, Im sorry - I don't see an easy way to do this for the moment. All the best, Andreas
do you know if i can download this data as a raster layer? i’ve found rasters but they are for accumulated years/months/days, i didn’t find an aggregate raster of daily rainfall
Hi, in Climate Engine on the top left select Make Map & then you can chose what values you would like and over what time period. This should make a raster map for you. All the best, Andreas
@@GeosearchInternational ok I will do that but I tried to download for the Ethiopia case and I couldnt find chirps -precipitation in the list chirps-4.8km-daily under global is ok for Ethiopia case?
Hi Muntasir, I just tried it and it works: bit.ly/3ci7I4p Please click on the download arrow on the top right of the screen to get the Excel file. All the best, Andreas
Hi Mercy, all links are in the description below the video. Link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p You need to select the download arrow - top right All the best, Andreas
@@GeosearchInternational thank you for the prompt response, I have tried several times to download as instructed but i am still failing. Is it possible to create a new link to the excel file please? TIA
Sorry to hear that. Must be a problem with Google. Please send me an e-mail - you can find it in the "About" section of the TH-cam channel. All the best, Andreas
@@GeosearchInternational Received with Thanks. Your video and Template has helped me a lot. I would like to know is there a method of how i can extract location coordinates for the precipitation data that I download through the Climate Engine App? I mean the excel file doesn't come with location coordinates. Thank you once again
Thank you!!! But I have a question... How can I know the resolution of this data? And if I need to download them in 0.25° and 0.05° resolution, what do I do and how can I do it? ... Thanks!
Hi Luz, In Climate Engine I think it only allows you to download at the native resolution of 1/20 of a degree (0.05°). In the video I was trying to get the most accurate time series, so that is the resolution I selected. If you want to make a map, you can also do that at the same resolution. If you want coarser resolutions, you can always resample the raster later on in QGIS. All the best, Andreas
Hi Tsega, you can make your catchment polygon shape files in any program you like. Just make sure to check that there are no errors in the polygon. I have been using ESRI products for over 20 years, but now work 100% in QGIS as it can do everything I need and is totally free. All the best, Andreas
Hi Yogesh, Try mine first: GEE Asset: code.earthengine.google.com/?asset=users/Geosearch/Afghanistan/AF_HMRB_SalmaDam_Catchment If it works, and your does not then you need to check the Check Vector Geometry - see minute 03:47 of the video. All the best, Andreas
Hi Rathna, Yes you can get data from a point location - for example to compare with a rain gauge - but remember that the pixel size is about 10x10 kilometres so it will be anyway an aerial average. For me the main strength of CHIRPS is to look at long term trends in the precipitation over a river basin, rather than to monitor how much rain falls on your house. All the best, Andreas
@@GeosearchInternational correct sir. Infact I would like to get grid data of a big catchment then would like to get some indices. There after on those grid estimated indices like to do trend analysis
Hi Rathna, In the video I'm just looking at the average precipitation over the whole catchment over time. Looking at the aerial distributions is also interesting, but you will need to deal with a lot more data which can be a challenge if your catchment is very large. A simple way is via giovanni.gsfc.nasa.gov/giovanni/ where you can get rasters of e.g. GPM monthly precipitation at 0.1 deg resolution for a whole country which you can then process easily in QGIS. Good luck and all the best, Andreas
@@GeosearchInternational do you have any tutorial/video on this? Getting time series data for multiple grid points at simultaneously? Other wise it becomes voluminous and leborious
Hi Rathna, Are you trying to get time series from different locations - e.g. "points" such as towns, or do you want to produce a map of your catchment showing e.g. the average precipitation in the month of May?
Thank you for your tutorial, it was beneficial. But how can we visualize these data in any GIS software based on their location? I did not see any X and Y fields in the data.
Hi Sulayman, in Climate Engine you should select "Make Map" in the top left corner. You can get the total CHIRPS precipitation for a time interval of your choice at 1/20 degree resolution (4 800m). All the best, Andreas
Thanks for the timely response, Sir. I've tried almost all the links but still not opening it says ' Site can't be reached'. Your channel has been really helpful to me. And this excel file will come as a life saver
It still works for me, but please download and use on your computer. Dont use Google Sheets. All the best, Andreas Link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p
How to create account in climate engine? I created one, but it says "user is not defined" and do not login. if you create a video about how to create an account for climate engine.
Hi Andreas, Please if you have any idea how can I detect the vessels in the basin using google earth imagery for different years. I know this question is not relevant for the presented video but I was wondering if you have any ideas. I would appreciate it if you could help. Many thanks. Best regards, Afrah
Hi Afrah, I assume you are interested in big ships, so a pixel size of 10 metres is OK. Just to look at them I would use the Sentinel-2 MSI: COPERNICUS/S2 To map the main shipping lanes I would use the Sentinel-1 C-band Synthetic Aperture Radar (SAR) instrument: COPERNICUS/S1_GRD All the best, Andreas
@@GeosearchInternational Hi Andreas, Thank you so much for your help. If I want to detect the vessels with dimensions (60m in length and 10m widely), do you think Sentinel1 would be useful, any suggestions!? Your time and reply are highly appreciated.
If it is 60m long, it should give a signal over at least 6 pixels, so you should see a blurred elongate shape. If it moves between satellite images it is probably a boat. Best thing is to try, and see what happens. Of course you also need to select cloud free images... All the best, Andreas
Sorry to hear that Abdo. It is probably an error with your catchment polygon. Have a look at the video again from 03:47 Step 2: Check Vector Geometry. Good luck & all the best, Andreas
Hi Cusco, yes it works everywhere on the planet - up to 50 deg north and south of the equator. There are also other precipitation data, but I like CHIRPS because of the long data record. All the best, Andreas
In the description below the video there are links to the data & the template, so you can try to follow the video with these if you like. All the best, Andreas Link to Salma dam catchment GEE Asset: code.earthengine.google.com/?asset=users/Geosearch/Afghanistan/AF_HMRB_SalmaDam_Catchment Link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p
thank you very much for uploading the important instructive video
You are most welcome Eng. Rasekhudin! All the best, Andreas
Pls can you add the previous video link here ?Thank you so much for this
As with all my videos, please look in the description below the video for details & links. All the best, Andreas
I have a catchment of 23000.km2.
However, the climate engine is unable to dowload time series data for the 40 years in chirps.pls is this a limitation of the application?
Pls how can I unravel this puzzle?
There is a limitation imposed by Google Earth Engine on the maximum number of data points. What you need to do is to download the data in smaller chunks - for example in sections of 5 or 10 years. All the best, Andreas
A very genuine instructor who has not withheld information and kept things simple, rather than, over complicating it.
Thank you Samir for your kind words! All the best, Andreas
Thankyou @ Andreas, for this informative video and CHIRPS template!!😊
You are most welcome Shimelils! All the best, Andreas
this is the best tutorial video on the subject! thank you so much
Thanks for your kind words Laura! All the best, Andreas
A very useful tutorial. Since I watched this video, I have been using climate engine to download most of the data I use for my analysis
Glad it helped Elias! Let me know if you have any issues with the Excel template. All the best, Andreas
Many Thanks for this wonderful video.
Most welcome Mohamed! All the best, Andreas
Thanks for sharing for this valuable effort. It is very useful for rainfall analysis and help us to understand basin characteristics.
It's my pleasure Douglas! All the best, Andreas
Thank you very much for the tutorial. You are my hero
Thanks for your kind words Christian! All the best, Andreas
Thank you very much for the video. It helped me for my research work in Argentina
You are welcome Frederico! All the best, Andreas
thank you very much for this tutorial, it helped me on my on going research
You are welcome! All the best, Andreas
Thank you, Andreas. I stumbled across your channel and I made sure I subscribed. A wonderful job is an understatement, You have done an exceptional job. And your Excel templates are just mind-blowing. I really appreciate your effort. Can you make a video on how to get catchment run-off data and also how to calculate catchment level water balance? Thank you
Thanks and welcome Onipe! Yes, I'm planning new videos in the series on Water Balance of River Basins (th-cam.com/play/PLp1lK6n-xb5MPuDmzx3xJK8RKKdFtQbMD.html) which are all about trying to get a reliable water balance using free online data.
Getting runoff is a challenge, and basically you need to have some real data from key locations, so that you can use that to extrapolate to un-gauged catchments. I have had some success in Vietnam using 2000-2020 average CHIRPS precipitation less MODIS evaporation to get the long-term average surplus water, which correlated very well with average measured runoff. If you use long term averages, then storage is less important - a kind of steady state.
We can estimate lake/reservoir volumes using the water area and the rating curve - am planning a video on that as well. Finally all this comes together in a simple A4 spreadsheet where we stick in all the inputs and outputs to the water balance, including water demand for irrigation, urban water supply, environmental needs etc. Anyway - lots of little videos coming up, but it takes time... All the best, Andreas
@@GeosearchInternational thank you very much we will appreciate. I use GRDC for my run-off maybe you should check it out
Hi Onipe, I have not yet tried GRDC, just the FLDAS runoff. It gives a good overview, but is probably better for regional studies. All the best, Andreas
You're a God send. Thank you
You are most welcome Wayne! All the best, Andreas
Thank you for the video and the links. Well explained.
You are welcome Mainza! All the best, Andreas
thank you very much. Excellent instructive video, it will help me a lot.
You are welcome Ruby! All the best, Andreas
Millions of thanks, that was quite helpful! 🙂
Most welcome Tansel! All the best, Andreas
Thanks a lot for teaching
It's my pleasure Vilon! All the best, Andreas
@@GeosearchInternational Thanks again, Andreas. I keep following you and expect to see more video clips!
I'm working on a few, but have been very busy with other work. All the best, Andreas
Thank you Andreas for the insightful video. It would be much appreciable if you could upload a video on how to do bias correction of CHIRPS data.
You are welcome Abdul Wahed! What I have noticed is that CHIRPS seems to be less accurate near the sea, but to do any kind of correction you also need good data to correct it to. As far as I understand the S in CHIRPS stands for station data, so it should already be corrected to some extent. Of course it depends on how many stations they use. All the best, Andreas
Very helpful video. Many thanks.
You are welcome Alphonce, All the best, Andreas
Excellent video, it will help me a lot. Thank you very much.
You are welcome Prof. Reurysson! All the best, Andreas
Great job for hydrologists, appreciate
It's my pleasure Eng. Samir! All the best, Andreas
Very much useful video.... Thanks a lot... It will help me a lot...
You are most welcome Pradeep! All the best, Andreas
Amazing.. thank you for sharing this tool!
You are welcome Maby! All the best, Andreas
Informative, thank you
Thanks for watching Tanui! All the best, Andreas
thanks sir for uploading very useful video
You are welcome Eng. Hamadullah! All the best, Andreas
for those that will find it difficult to get their shapefiles accepted by the websites need not to worry, you could just use the Globe earth viewer window by the side and zoom to the area of your interest, and then use the rectangle tool to draw a rectangle over the proposed area, so the system could register your proposed study area
Hi Okon,
The purpose of using a polygon as the "cookie cutter' is to get the exact precipitation over the catchment area. This data will be used later to compare with e.g. evapotranspiration data to work out a water balance. Drawing an approximate rectangle is not recommended. If you are having problems with your shape file it is because there are errors in it. Please have a look at minute 03:47 Step 2: Check Vector Geometry in the video on how to fix this problem. All the best, Andreas
Thank you for the wonderful instruction. May you suggest how to download the data for a large number of polygon. In my case, I need to extract data for all the district in Vietnam (about thousands districts). Thank you!
You are welcome Shikalichinh. With the ClimateEngine you can just download the data for one polygon at a time. If you need daily rainfall it is better if you use Google Earth Engine to extract the data. If you just want annual data, or the mean monthly data you could make a raster in ClimateEngine and then use QGIS to extract the data for each district.
I did a project in Vietnam recently and the CHIRPS data was very good inland, but underestimated precipitation near the coast. Something to do with the cyclones. Near the coast GPM_3IMERGDF_06 is better. You can get it from Giovanni giovanni.gsfc.nasa.gov/giovanni/ as a raster. Always check the satellite data against ground data. Sometimes it can be problematic - especially near the coast or in the mountains.
Good luck & all the best, Andreas
Good job Mr
Thanks Muhammad, All the best, Andreas
Thank you so much. Very good video :)
You are welcome Maria! All the best, Andreas
Thank you for this video
You are welcome Bukhosi! All the best, Andreas
Great work done
Thanks! All the best, Andreas
This is one of the best video I have seen recently.I thank you for sharing it.I tried loading shapefile from SWAT ArcGIS but it didn't yield positive result. Must I delineate catchment in qgis to get it right.
Hi Imuwahen, firstly thanks so much for your kind words! Any shape file is fine but you need to check the validity of your vector geometry. I'm sure that you can do it in ArcGIS. The problem is that programs like SWAT sometimes produce triangular holes in the polygon, often at the edges. They can be very small so you need to find them with your GIS program & then edit them out. What you need is a clean polygon without any holes, or programs like Climate Engine will get confused. Good luck & all the best, Andreas
This is a great one. Thank you very much
You're very welcome David! All the best, Andreas
Hi, Sir this video you made makes my life easy on accessing the Precipitation data I was looking for, thank you so much, I only have one question. the areal mean rainfall data we get for a catchment, is it calculated based on the arithmetic mean or Theissen polygon or any other methods such as coding? Mulugeta.
You are most welcome Mulugeta! The mean is calculated from all the pixels inside your catchment polygon. Each one is about 10x10 km in size, so basically it is a grid or raster of cells, and we take the average of them all. CHIRPS is quite good at measuring precipitation, but I have had problems in coastal areas and apparently there could also be issues in mountainous areas. It would be good if you compare the CHIRPS precipitation at some point locations where you have station data. The approach in the video is for areas, but you can also chose points. Good luck & all the best, Andreas
Thanks for your intervention.
Need to help, i want to know how to analyze and what are the different steps to analyze the chirps data.
Hi Siaka, What analysis steps you do depends on what you are looking for in the data. Have a look at this video: th-cam.com/video/KdPht_4F-M0/w-d-xo.html All the best, Andreas
Thank you so much. Please how to get your CHIRPS Excel template you used to process the data?
Hi Valery, I have put all the important links in the description below the video. e.g. link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p All the best, Andreas
@@GeosearchInternational Thank you so much
@@valerykouassi-k5e Welcome! All the best, Andreas
Thank you sir
You are welcome! All the best, Andreas
thank you for the good video, help me for sure
You are welcome! All the best, Andreas
thanks for the video. it is very helpful for me. can you share a video to get the daily streamflow data? i tried GRDC, but it doesn't have the river i'm looking for. so is there any way to have the streamflow data any of the river of the world?
GRDC is probably the best database of flows, so if they don't have it you need to look for the flows using local sources. An alternative is to use radar altimetry, but to convert that into flows you will need the rating curves. Have a look at: hydroweb.theia-land.fr/?lang=en&
All the best, Andreas
@@GeosearchInternational thanks a lot.
Welcome! All the best, Andreas
man... você é muito bom! que video sensacional! parabéns! Ajudou muito! um beijo no seu coração!!!!
Fico feliz que tenha gostado do vídeo do CHIRPS. Obrigado pelas suas palavras gentis!!! All the best, Andreas
good morning! I need the raster image of the period of my study area. Can I download this file on this platform? Help me please. Thanks
Hi Gustavo, yes you can download the data as maps, which is a separate option from the time series. Chose Make Map - top left of the screen. All the best, Andreas
Andréas, thank you very much for your response. I have another question: I need to analyze a long period (30 years), could you tell me if I need to download a raster for each year and merge them later or could I download just one raster from this period? If it is the first option, how can I combine them in GIS? Thanks a lot for the help.
Hi Gustavo, If you want to get the average annual CHIRPS precipitation grid, you should download the total precipitation for each year and then calculate the average annual precipitation for all grids. You can do this in QGIS using the Raster Calculator. At this level of processing, it is probably quicker to use the Google Earth Engine. One thing you need to be careful about is if your project area contains any coastal or mountainous regions as sometimes CHIRPS is less accurate there. Always compare station data with CHIRPS, and also have a look at GPM precipitation - you can get the grid using Giovanni (giovanni.gsfc.nasa.gov/). All the best, Andreas
Thanks very much for the video, where can I find the chirps excel template file that you used for analysis... anyone to help please..?
Hello, managed to download it, I will be using it for my research, thanks very much 🙏🙏🙏🙏
You are most welcome Biemba! Please always compare the CHIRPS data with ground stations. Over longer time periods (months/quaters/years) it should be comparable, though I have had problems in coastal areas & mountainous areas. Let me know how it goes & all the best, Andreas
Hi I did everything for Sava river basin which is located in western Balkans and the only thing I find confusing is pick the region thing. Suddenly i get 10 regions all with different values. What should I do?
The shape file you are using probably consists of 10 different polygons. Check it in your GIS and see which one is the correct one to use. To avoid confusion it is better to have a single polygon for your catchment. All the best, Andreas
@@GeosearchInternational thank you very much it worked.
That’s good news! All the best, Andreas
Really great! I've worked with CHIRPS before, and it is very good for places where there's no precipitation records. I was wondering, is there any way to get sub hourly precipitation data as good as CHIRPS?? CHIRPS is great, but for small watersheds a day-time period is not appropriate, especially if you want to take into account floods, that in small watersheds, with a small time of concentration happen in less than a day. Or do you know about a software to disaggregate daily precipitation into hourly?
You are right, the daily data is only good for water balances & I usually average it to monthly time steps. By then it usually gets quite close to data from ground stations. I am also looking for an easy way to get sub-hour data that does not involve knowledge of advanced python/Jupyter Notebooks. At the moment the best one I know of is GPM IMERG Final Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V06 (GPM_3IMERGHH). You can have a look at the details at: disc.gsfc.nasa.gov/datasets/GPM_3IMERGHH_06/summary
In giovanni.gsfc.nasa.gov/giovanni/ just search for IMERGHH. You can get Time Series - Area Averaged data, but the problem is the cookie cutter. They only let you select the major river basins or countries. You can draw a rectangular bounding box, but you cannot upload a catchment... That's why I don't use Giovanni, except for making grids for precipitation maps. I guess you could use it to get the accumulated precipitation grid that fell over a certain number of hours on a particular day. Let me know if you find an easy solution & all the best, Andreas
@@GeosearchInternational yeah heard of IMERG. Tried to download but it takes really a long long time. How do you download the data???
I am also looking for an easy way. Perhaps it is necessary to use STORM... storm.pps.eosdis.nasa.gov All the best, Andreas
Hi, thank you very much for this video. I was able to download the CHIRPS data for my catchment areas. However during the process, in the Pick as Region option, the data displayed was “1” although I edited the attribute table. Would that affect my downloaded data? Like, will it give me the wrong data? Thank you very much
Hi Jhunas, You will always need to chose the region even if the polygon is a single region. When you load the polygon you will see the extent on the satellite image. That is a good control on if you have loaded the correct polygon. All the best, Andreas
@@GeosearchInternationalThank you very much for this. I learned so much from your videos.
Thanks for your kind words! All the best, Andreas
Very nice video
Thanks Eng. Hosain! All the best, Andreas
Dear Andreas, thanks for the Excellent video.
I would like to know how you make "salman" 10:15 .
I watched whole the video but didn't find .
thanks
Hi Aysuf, You need to upload the shape file into Google Earth Engine. See: th-cam.com/video/TPSN71KuOUM/w-d-xo.html
However, please make sure that you check the vector geometry. th-cam.com/video/TPSN71KuOUM/w-d-xo.html If there are errors in the catchment shape file (like holes) it may not work.
In the description below the video you can also find links to other resources.
Good luck and all the best, Andreas
Very interesting tutorial but How temperature data is downloaded from climate engine?
Hi Abdi Guta, select Remote Sensing under the variable type and have a look at the options. I think you can get Land Surface Temperature from Landsat 5/7/8/9 - 30m resolution since 1984, but there are also others. Have a look at th-cam.com/video/KdPht_4F-M0/w-d-xo.html for ideas on how to process it in Excel. All the best, Andreas
Hi, nice tutorial. Just wondering though, why did you have to go through the trouble of using google earth engine at all? since climate engine provides the option to directly specify a shapefile., so why would you pick the table asset path?
Hi @r2ishara, when I made this CHIRPS video I did not see the shape file option, so I assume that it was added later. At that time I also made a video about MODIS evapotranspiration using AppEEARS where you can upload a shape file of the catchment. I also made some videos on how to make the catchment shape file in QGIS. All this was part of getting the water balance for catchments. All the best, Andreas
Thanks a lot
Most welcome Eng. Zazay! All the best, Andreas
Thank you so much, Your video has been very helpful to my work. Please, how can I get the CHIRPS template?
Hi Arthur, Glad it is useful for your work. I have put all the important links in the description below the video. e.g. link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p
All the best, Andreas
@@GeosearchInternational Thank you so much.
Welcome! All the best, Andreas
Sir,
When I am trying to paste the path to an Earth Engine Table Asset. It is showing me "Asset loading failed: path invalid."
As I Have been working on Bhadra Dam, the rest of the steps is done correctly. What do you think I should do?
Hi Kanishk, in GEE next to your uploaded asset there is a share icon. Make sure that everyone can read is selected. If that does not work, then you need to check your polygon in QGIS to make sure that it is valid ie no holes. Vector | Geometry Tools | Check Geometry Validity. All the best, Andreas
Can you assist with a tutorial of how to get x,y pixel values for stations time series not a polygon but multiple points for daily rainfall
Hi Tebogo, That's an interesting question & useful if we want to compare the satellite data with ground measurements.
I have tried to get CHIRPS precipitation in Climate Engine. It only allows 5 individual points and they need to be entered manually. After that it failed to process, as it said that was too much work for the Google Servers. I deleted each point & finally managed to get CHIRPS data for a single location. Getting temperature and evapotranspiration data (PET & ET) via AppEEARS worked very easily and you just need to upload a CSV file with the coordinates.
In conclusion, it is possible but cumbersome to get the CHIRPS precipitation data via the Climate Engine, and you probably have to do one station at a time. Of course it is possible to get the whole lot via Google Earth Engine, but I'm trying to find tools which can be used easily by any scientist - not just the programmers. So, Im sorry - I don't see an easy way to do this for the moment. All the best, Andreas
do you know if i can download this data as a raster layer?
i’ve found rasters but they are for accumulated years/months/days, i didn’t find an aggregate raster of daily rainfall
Hi, in Climate Engine on the top left select Make Map & then you can chose what values you would like and over what time period. This should make a raster map for you. All the best, Andreas
thank you very much it is helpful but how I could have a grid based data?
Hi Ertiban, Instead of selecting Make Graph on the top left, select make Map. All the best, Andreas
@@GeosearchInternational ok I will do that but I tried to download for the Ethiopia case and I couldnt find chirps -precipitation in the list chirps-4.8km-daily under global is ok for Ethiopia case?
@@ertibanwondifraw7540 CHIRPS covers 50°S-50°N, so Ethiopia is covered under the global data. All the best, Andreas
Hi Andreas, great tutorial. The link to download the template excel is not working. Can you please check?
Hi Muntasir, I just tried it and it works: bit.ly/3ci7I4p
Please click on the download arrow on the top right of the screen to get the Excel file. All the best, Andreas
Thank you for this video, I am unable to download the CHIRPS daily template . Can you share the link once again?TIA
Hi Mercy, all links are in the description below the video. Link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p You need to select the download arrow - top right All the best, Andreas
@@GeosearchInternational thank you for the prompt response, I have tried several times to download as instructed but i am still failing. Is it possible to create a new link to the excel file please? TIA
Sorry to hear that. Must be a problem with Google. Please send me an e-mail - you can find it in the "About" section of the TH-cam channel. All the best, Andreas
Hi Mercy, I sent you the file already. For other tools, please try to find the download arrow on the top right of your screen. All the best, Andreas
@@GeosearchInternational Received with Thanks. Your video and Template has helped me a lot.
I would like to know is there a method of how i can extract location coordinates for the precipitation data that I download through the Climate Engine App? I mean the excel file doesn't come with location coordinates. Thank you once again
Thank you!!! But I have a question... How can I know the resolution of this data? And if I need to download them in 0.25° and 0.05° resolution, what do I do and how can I do it? ... Thanks!
Hi Luz, In Climate Engine I think it only allows you to download at the native resolution of 1/20 of a degree (0.05°). In the video I was trying to get the most accurate time series, so that is the resolution I selected. If you want to make a map, you can also do that at the same resolution. If you want coarser resolutions, you can always resample the raster later on in QGIS. All the best, Andreas
@@GeosearchInternational Thank you so much!
Welcome! All the best, Andreas
Hoz do you do to dowlload CHIRPS template with excel file?
You will find the link in the description below the video. All the best, Andreas
does it has to be QGIS only? can't i use arcgis?
Hi Tsega, you can make your catchment polygon shape files in any program you like. Just make sure to check that there are no errors in the polygon. I have been using ESRI products for over 20 years, but now work 100% in QGIS as it can do everything I need and is totally free. All the best, Andreas
@@GeosearchInternational Thank You so much. that was really helpful
Welcome! All the best, Andreas
I uploaded the shapes files on GEE,now while uploading in Climate engine,path invalid is showing.help me upload correctly.
Hi Yogesh, Sounds like it cannot find the path. Have you shared the shape file in GEE to the public? All the best, Andreas
@@GeosearchInternational yes sir ,I checked on “Anyone can read” then copied the path and paste in climate engine under custom polygon…
Hi Yogesh, Try mine first: GEE Asset: code.earthengine.google.com/?asset=users/Geosearch/Afghanistan/AF_HMRB_SalmaDam_Catchment
If it works, and your does not then you need to check the Check Vector Geometry - see minute 03:47 of the video. All the best, Andreas
Yesssss
It worked …..
Thanks a lot.
Love from India.
Good to hear Yogesh! All the best from Spain, Andreas
Sir, instead of a catchment area, is it possible to extract the point rainfall data
Hi Rathna, Yes you can get data from a point location - for example to compare with a rain gauge - but remember that the pixel size is about 10x10 kilometres so it will be anyway an aerial average. For me the main strength of CHIRPS is to look at long term trends in the precipitation over a river basin, rather than to monitor how much rain falls on your house. All the best, Andreas
@@GeosearchInternational correct sir. Infact I would like to get grid data of a big catchment then would like to get some indices. There after on those grid estimated indices like to do trend analysis
Hi Rathna, In the video I'm just looking at the average precipitation over the whole catchment over time. Looking at the aerial distributions is also interesting, but you will need to deal with a lot more data which can be a challenge if your catchment is very large. A simple way is via giovanni.gsfc.nasa.gov/giovanni/ where you can get rasters of e.g. GPM monthly precipitation at 0.1 deg resolution for a whole country which you can then process easily in QGIS. Good luck and all the best, Andreas
@@GeosearchInternational do you have any tutorial/video on this? Getting time series data for multiple grid points at simultaneously? Other wise it becomes voluminous and leborious
Hi Rathna, Are you trying to get time series from different locations - e.g. "points" such as towns, or do you want to produce a map of your catchment showing e.g. the average precipitation in the month of May?
Thank you for your tutorial, it was beneficial. But how can we visualize these data in any GIS software based on their location? I did not see any X and Y fields in the data.
Hi Sulayman, in Climate Engine you should select "Make Map" in the top left corner. You can get the total CHIRPS precipitation for a time interval of your choice at 1/20 degree resolution (4 800m). All the best, Andreas
@@GeosearchInternational
Thanks for your cooperation, I appreciate it. waiting for more useful videos...
Welcome Sulaiman! All the best, Andreas
Hi, link to the excel file not working Sir
Hi Aminu, did you use this one: bit.ly/3ci7I4p
Click the download button - top right of the screen.
All the best, Andreas
Thanks for the timely response, Sir. I've tried almost all the links but still not opening it says ' Site can't be reached'. Your channel has been really helpful to me. And this excel file will come as a life saver
Sorry to hear that. Please send me an e-mail. You can find my address in the About section. All the best, Andreas
It's working now, thank you very much. You're the best.
Good news! All the best, Andreas
Thanks for the video. A nice one. How can I get the excel template used in this tutorial? Thank you.
Hi Jude, you are welcome.
Here is the link to the template: bit.ly/3ci7I4p
All the best, Andreas
@@GeosearchInternational Your response is appreciated. More power to your elbows!
Thanks Jude! Greetings from Spain, Andreas
Thanks for the video! Could you pls reupload the excel file? Its not availble
It still works for me, but please download and use on your computer. Dont use Google Sheets. All the best, Andreas
Link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p
@@GeosearchInternational Thansk a lot it worked!
Great news! all the best, Andreas
How to create account in climate engine? I created one, but it says "user is not defined" and do not login. if you create a video about how to create an account for climate engine.
Please have a look at th-cam.com/video/Vjs1QKx7XlE/w-d-xo.html
All the best, Andreas
Hi Andreas,
Please if you have any idea how can I detect the vessels in the basin using google earth imagery for different years. I know this question is not relevant for the presented video but I was wondering if you have any ideas. I would appreciate it if you could help.
Many thanks.
Best regards,
Afrah
Hi Afrah, sorry I don't understand your question. By vessel do you mean a ship? All the best, Andreas
@@GeosearchInternational Hi Andreas, many thanks for your reply. Yes I mean ships!
Hi Afrah,
I assume you are interested in big ships, so a pixel size of 10 metres is OK.
Just to look at them I would use the Sentinel-2 MSI: COPERNICUS/S2
To map the main shipping lanes I would use the Sentinel-1 C-band Synthetic Aperture Radar (SAR) instrument: COPERNICUS/S1_GRD
All the best, Andreas
@@GeosearchInternational Hi Andreas,
Thank you so much for your help. If I want to detect the vessels with dimensions (60m in length and 10m widely), do you think Sentinel1 would be useful, any suggestions!?
Your time and reply are highly appreciated.
If it is 60m long, it should give a signal over at least 6 pixels, so you should see a blurred elongate shape. If it moves between satellite images it is probably a boat. Best thing is to try, and see what happens. Of course you also need to select cloud free images... All the best, Andreas
How to extract the precipitation data for final use
In the video I demonstrate how this is done. Let me know if you have any problems. All the best, Andreas
CHIRPS does not work and the download gives me error message ?
Sorry to hear that Abdo. It is probably an error with your catchment polygon. Have a look at the video again from 03:47 Step 2: Check Vector Geometry. Good luck & all the best, Andreas
Hi Andrea. Can we use this in Europe? Or are there other satellite tools for Europe?
Hi Cusco, yes it works everywhere on the planet - up to 50 deg north and south of the equator. There are also other precipitation data, but I like CHIRPS because of the long data record. All the best, Andreas
supeeeeeeerbbbbbb
Glad you find it useful! All the best, Andreas
How to re-jester Climante Engine
app.climateengine.com/climateEngine
Hi Dereje, just visit this site & sign in with your Google Account. All the best, Andreas
How to export data for final use
In the description below the video there are links to the data & the template, so you can try to follow the video with these if you like. All the best, Andreas
Link to Salma dam catchment GEE Asset: code.earthengine.google.com/?asset=users/Geosearch/Afghanistan/AF_HMRB_SalmaDam_Catchment
Link to CHIRPS Excel template for daily precipitation data: bit.ly/3ci7I4p
@@GeosearchInternational and annually data? As I am new to gis so asking again and again
Hi Smurf, Please watch the video. There is a Pivot table that extracts the annual data. All the best, Andreas
Sir, How to get CHIRPS template?
Hi Irfan,
Please check in the description below the video for useful links.
Here is the link to the template: bit.ly/3ci7I4p
All the best, Andreas
Hllo sorry I try many time but I steal get and error
Sorry to hear that. Did you check your SHP file in QGIS for errors? All the best, Andreas