great video series. I am a retired geologist, who first got involved with GIS very early in the late 80s. I retired about 5 1/2 years ago and my last job was geologic mapping. Many areas in my state had lidar data and there was nobody to produce high resolution surface models so I learned how with ESRI products. I learned about Cloud Compare in a non terrestrial short course, but there were some gaps as it wasn’t finished. Now I have some personal archaeology/geneology tasks quite similar to looking for faults and geological contacts and brand new statewide lidar dataset. I started with GRASS and have followed QGIS development for a long time. Bottom line your QGIS 4 Arch series is proving a great memory jogger for someone, who knows what he is doing, but needs a little refresher. The $100 for a non-commercial ESRI license would be doable, but I have never liked how Jack Dangermond et al wiped out the competition and I watched this happen presonally.
May I ask how you would go about isolating buildings from a DSM or Lidar to a raster. I have attempted to use building footprints in a shp. format and extract its mean ground elevation from zonal statistics, and raster calculator (DSM-DTM) to extract the buildings. But the buildings often have noise around the edges that would be preferable to refine. Thank you for brilliant content.
Thanks for watching and the kind words. I would start in CloudCompare and extract values 5.1 - 6.1. The classification value for buildings is usually 6, but check your LiDAR data. Once you've extracted this, use the Rasterize function and under the "Empty cells" section of the Rasterize window, use the drop-down box to select leave empty. Then, when you export the raster it will only have points associated with the buildings. This will create a raster file with only points from within the buildings. You could then use this to compare with the building footprint shapefiles. Hope that helps!
Thank you for the video, it already helped a lot. However, I get the spaghettification (even with reprojecting in LASTools) only during the "rasterize" window, once I hit "update" grid. Before that, all looks normal. Do you have an idea what might be causing this?
Alright scratch this. The answer is: cloud compare defaulted the setting for me to Projection->direction-> X values, when it is supposed to be Z. my bad.. thanks again for the great video!
Is there a way to assign a CRS to the DEM when exporting it? I’ve used this tutorial a few times now and never had an issue in QGIS, but I made a DEM for use by a coworker in ArcMap and it wouldn’t play nice.
great video series. I am a retired geologist, who first got involved with GIS very early in the late 80s. I retired about 5 1/2 years ago and my last job was geologic mapping. Many areas in my state had lidar data and there was nobody to produce high resolution surface models so I learned how with ESRI products. I learned about Cloud Compare in a non terrestrial short course, but there were some gaps as it wasn’t finished. Now I have some personal archaeology/geneology tasks quite similar to looking for faults and geological contacts and brand new statewide lidar dataset. I started with GRASS and have followed QGIS development for a long time. Bottom line your QGIS 4 Arch series is proving a great memory jogger for someone, who knows what he is doing, but needs a little refresher. The $100 for a non-commercial ESRI license would be doable, but I have never liked how Jack Dangermond et al wiped out the competition and I watched this happen presonally.
Glad the videos are useful!
Great videos. They are perfectly structured and encouraging for anyone who may want to use GIS in day to day work practice.
Thanks for watching, and the kind words!
So good! Thank you for this!
Thanks, glad you liked it!
Impressive. Thanks a lot.
You are very welcome! :)
May I ask how you would go about isolating buildings from a DSM or Lidar to a raster. I have attempted to use building footprints in a shp. format and extract its mean ground elevation from zonal statistics, and raster calculator (DSM-DTM) to extract the buildings. But the buildings often have noise around the edges that would be preferable to refine. Thank you for brilliant content.
Thanks for watching and the kind words. I would start in CloudCompare and extract values 5.1 - 6.1. The classification value for buildings is usually 6, but check your LiDAR data. Once you've extracted this, use the Rasterize function and under the "Empty cells" section of the Rasterize window, use the drop-down box to select leave empty. Then, when you export the raster it will only have points associated with the buildings. This will create a raster file with only points from within the buildings. You could then use this to compare with the building footprint shapefiles. Hope that helps!
Thank you for the video, it already helped a lot.
However, I get the spaghettification (even with reprojecting in LASTools) only during the "rasterize" window, once I hit "update" grid. Before that, all looks normal.
Do you have an idea what might be causing this?
Alright scratch this. The answer is:
cloud compare defaulted the setting for me to Projection->direction-> X values, when it is supposed to be Z.
my bad..
thanks again for the great video!
@@kamkr8442 No worries, and thanks for coming back with the solution!
Is there a way to assign a CRS to the DEM when exporting it? I’ve used this tutorial a few times now and never had an issue in QGIS, but I made a DEM for use by a coworker in ArcMap and it wouldn’t play nice.
Where'd you get the killer music?
It was included via Filmstro (filmstro.com/).
Last sentence for previous comment: So I will contribute the $100 per year to QGIS and if possible Cloud Compare development instead.