topic How can I use Con in ArcGIS Pro? in ArcGIS Pro Questions

How can I use Con in ArcGIS Pro?

YoshikiYamaguchi — Tue, 08 Sep 2020 05:46:54 GMT

I am trying to implement Koppen's Climate classification on my map based on the amount of precipitation and temperature in US. The following is the criteria for B climate zones.

"70% or more of annual precipitation falls in the summer half of the year and r less than 20t + 280, or 70% or more of annual precipitation falls in the winter half of the year and r less than 20t, or neither half of the year has 70% or more of annual precipitation and r less than 20t + 140"

What I did was that I used a modelbuilder to calculate r less than 20t + 280, r less than 20t, and r less than 20t + 140, and then I tried to use Con tool to assign each one of these 3 if certain condition is true (70% or more of annual precipitation falls in the summer half of the year, 70% or more of annual precipitation falls in the winter half of the year , and else).

The picture below is my model. The one in the middle is where I did the calculation of 3 different values, and the one on the left if my Con expression for summer and the left one is my con expression for winter.

How can I do the "else" in Con tool?

Re: How can I use Con in ArcGIS Pro?

Robert_LeClair — Tue, 08 Sep 2020 22:15:15 GMT

One idea that comes to mind is to use the Raster Calculator GP tool in your ModelBuilder. In the Raster Calculator, create a nested CON statement as described in the following link here.

There is an example of three CON statements in a single statement: OutRas = Con(InRas1 > 23, 5, Con(InRas1 > 20, 12, Con((InRas1 > 2) & (InRas1 < 17), Sin(InRas1), 100)))

Hope this helps!

Re: How can I use Con in ArcGIS Pro?

YoshikiYamaguchi — Wed, 09 Sep 2020 03:39:19 GMT

Thank you so much! This is what I needed.

I think I got it working finally!

Re: How can I use Con in ArcGIS Pro?

YoshikiYamaguchi — Wed, 09 Sep 2020 03:42:33 GMT

OK My result is still not showing the value for when it is false. Can you help me see what I did wrong?

I have 2 expressions for when it is true and one for when it is false.

I want to return "Neithervalue" when it is false, but it is not displayed on my map.

Con("%PRISM_ppt_30yr_normal_800mM2_annual_bil.bil%"*0.7 >= "%PRISM_ppt_30yr_normal_800mM2_09_bil.bil%" + "%PRISM_ppt_30yr_normal_800mM2_08_bil.bil%" + "%PRISM_ppt_30yr_normal_800mM2_07_bil.bil%" + "%PRISM_ppt_30yr_normal_800mM2_06_bil.bil%" + "%PRISM_ppt_30yr_normal_800mM2_05_bil.bil%" + "%PRISM_ppt_30yr_normal_800mM2_04_bil.bil%" , "%Summervalue%",

Con("%PRISM_ppt_30yr_normal_800mM2_annual_bil.bil%" * 0.7 >= "%PRISM_ppt_30yr_normal_800mM2_03_bil.bil%" +"%PRISM_ppt_30yr_normal_800mM2_02_bil.bil%" +"%PRISM_ppt_30yr_normal_800mM2_01_bil.bil%" +"%PRISM_ppt_30yr_normal_800mM2_12_bil.bil%" +"%PRISM_ppt_30yr_normal_800mM2_11_bil.bil%" +"%PRISM_ppt_30yr_normal_800mM2_10_bil.bil%","%Wintervalue%",

"%Neithervalue%"))

Re: How can I use Con in ArcGIS Pro?

Robert_LeClair — Thu, 10 Sep 2020 21:37:43 GMT

Would using the ModelBuilder If-Then-Else Logical tools work for your workflow? You can find more about the various logical tools here.

Re: How can I use Con in ArcGIS Pro?

YoshikiYamaguchi — Mon, 14 Sep 2020 02:13:15 GMT

Thanks it worked!