Many thanks. I remember hearing about Mr. Snow's analyses in James Burke's excellent 1985 series "The Day the Universe Changed". Being able to work the actual data makes me feel part of history.
Absolutely! I'm glad you found it useful, and yes - working with these data is kind of a fascinating way to further explore history a bit on your own. It does really help bring it home I think.
Thank you!! (Our class uses your TH-cam video as an example of how to do it! Also, I find it interesting that John Snow took time out of his daily routine of saving Westeros from white walkers and zombie dragons to help find the cause of the Cholera outbreak. A hero all 'round really wasn't he! ;-))
I attempted to use this technique to display density using point data representing bicycle thefts. Instead of a graduated circle or glob shown in the video I repeatedly got big blue dark and light squares behind my city layer. I tried using kernel and point density and the results were the same.
Great video. Do you know how to perform a Network Kernel Density Estimation (NKDE) analysis using points and roads? If so, please make a video explain how to do it. Thanks in advance.
Could you help me understand the output cell size you used, as well as the search radius? How do I know what values will be appropriate for my project?
Culper Junior Hi Culper - if I read your question correctly you want to create a density surface of the pumps with the deaths combined? Technically you could merge the two layers together and create a density surface, but I'm not sure why you would want to do that. You might be interested in reading a bit about calculated rasters, which allow you to combine two (potentially weighted) surfaces together. Again, not clear that would work for anything of interest for this particular example, but they are powerful and the help within ArcGIS does a nice job of walking you through the details of such tools. Good luck!
8:13 - 8:18 Can you manually make the box that surrounds the data points larger? I have a very large map with data points scattered throughout but the box is only including some of my data points because of the weight. Any advice?
Hi Chris, thanks for the tutorial. I used the tutorial and my results would give me kernel densities on each separate death incident instead of coming out as a group like in your case. Could you help me out?
Hi Jesus - For a similar, downloadable dataset from Yale University see the link in the video description (I can't put links here in the comments). Hope that helps, Chris
If you have a text file with data in this format: Name X Y then use ArcGIS’ menu File > Add Data > Add XY Data… to display it in ArcGIS. To save the result as a shapefile, right-click on it, and in its contextual menu Data > Export Data…
We've come along way with ArcMap and ArcPro since this video was made. Great demonstration, thanks!
Thank you for the short video combining kernel density and contour tool along with the link of the data.
Many thanks. I remember hearing about Mr. Snow's analyses in James Burke's excellent 1985 series "The Day the Universe Changed". Being able to work the actual data makes me feel part of history.
Absolutely! I'm glad you found it useful, and yes - working with these data is kind of a fascinating way to further explore history a bit on your own. It does really help bring it home I think.
Thank you!! (Our class uses your TH-cam video as an example of how to do it! Also, I find it interesting that John Snow took time out of his daily routine of saving Westeros from white walkers and zombie dragons to help find the cause of the Cholera outbreak. A hero all 'round really wasn't he! ;-))
Hah! Pretty funny. Now we just need a density surface of the white walkers north of the wall!
Excellent lesson, thank you Chris.
Excelente muestra, que después de 1984, ha sido la base en la cual se ha sustentado el análisis SIG. hay posibilidad de que pases los datos?
Thank you very much !!! Practical and easy tutorial.
+Keron Sooklal Happy it was helpful!
I attempted to use this technique to display density using point data representing bicycle thefts. Instead of a graduated circle or glob shown in the video I repeatedly got big blue dark and light squares behind my city layer. I tried using kernel and point density and the results were the same.
Glad it helped Keith!
Great video.
Do you know how to perform a Network Kernel Density Estimation (NKDE) analysis using points and roads? If so, please make a video explain how to do it. Thanks in advance.
Am happy for this application
I want to be applying it in practice
Thanks a lot Chris, very helpful
it was very helpful and i request you whcih software havw u used
Could you help me understand the output cell size you used, as well as the search radius? How do I know what values will be appropriate for my project?
Hi Chris,
If you wanted to show density/kernal of multiple kinds of points (i.e. the density of pumps and deaths), is that possible?
Culper Junior Hi Culper - if I read your question correctly you want to create a density surface of the pumps with the deaths combined? Technically you could merge the two layers together and create a density surface, but I'm not sure why you would want to do that. You might be interested in reading a bit about calculated rasters, which allow you to combine two (potentially weighted) surfaces together. Again, not clear that would work for anything of interest for this particular example, but they are powerful and the help within ArcGIS does a nice job of walking you through the details of such tools. Good luck!
This is very good tutorial, many thanks for this. Can I get this data (shap file)?
8:13 - 8:18 Can you manually make the box that surrounds the data points larger? I have a very large map with data points scattered throughout but the box is only including some of my data points because of the weight. Any advice?
Hi Chris, thanks for the tutorial. I used the tutorial and my results would give me kernel densities on each separate death incident instead of coming out as a group like in your case. Could you help me out?
nice . easy and informative
Hello
Can you help me by a question ?
What do you mean by the following traveler problem?
Good Material...Thanks!!!
Happy it was helpful Jamer!
What is the keyword of learning GIS software?
How do I learn GIS software effectively?
thanks it's very nice
May I know how to download this video
Hi Jesus -
For a similar, downloadable dataset from Yale University see the link in the video description (I can't put links here in the comments).
Hope that helps,
Chris
Hi Chris the link for John Snow cholera data is unavailable, Could you help me out where is to get the data?
as same as you
I am having issues with the hotspot, the circles cut off right from where my data ends.. how do I change it to show the full circles?
God reward you!
Chris, I used the dataset in the given link but the density looks different on ArcGIS? Have the data been changed?
From where to get/download this vector data
thank you.Nice........................
Thank you
Madani Zakri You're welcome Madani!
pls！need new url to get data
How do I make a shp. file? I'm starting with ArcGis and I don't know how this kid of files are created!
Hi. I help you. I from Turkey. Where are you from
If you have a text file with data in this format:
Name X Y
then use ArcGIS’ menu File > Add Data > Add XY Data… to display it in ArcGIS. To save the result as a shapefile, right-click on it, and in its contextual menu Data > Export Data…
Activate your ArcToolBox, Administrative Tools, Feature class, create a feature class, then select the type of feature you want... See you.
thanks it's very nice