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four color theorem for symbolization | ArcGIS Pro 2.0?

VincentLaunstorfer

Hi,

Since ArcGIS Desktop 9, I always found the four color theorem great to symbolized to depict layers with a lot of polygons (such as census tracts) so that no two adjacent polygons have the same color. It used to be called "Map Coloring - Four Color a Map" and basically applied the 4-color map theorem to a polygon file by adding a column with integers. Howerver, it never really worked under ArcGIS Desktop 10 and was desperate to use it again, as explained here:

https://community.esri.com/thread/27844

I now installed ArcGIS Pro 2.0 and perhaps ESRI included this symbolization style in their new GIS desktop application? For the time being, I cannot find anything such as "4-color map" tool... Is it somewhere included? Or is there any workaround or script with the new ArcGIS Pro 2.0?

Thanks

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Bud

This functionality was added to ArcGIS Pro in version 3.4.

GerryGabrisch

This Python code seems to work just fine. There are heaps of possible contingencies with polygons so any errors would interest me. https://github.com/LummiGIS/Four-Color-Map-For-GIS

danashney

Would need to modify the script a wee bit from 2.x to 3.x if you want it in Pro...

https://gis.stackexchange.com/questions/54029/how-to-apply-the-four-colors-theorem-in-a-polygon-map-in-arcgis-arctoolbox-autom

DanPatterson_Retired

Jerry ... thanks for the report and nice to see that it works

JerryChase2

I just downloaded and used http://www.arcgis.com/home/item.html?id=5fa04ce288284c999f70464e1c3b2e82 in ArcGIS Pro 2.0.1. I had no problems. I use it to symbolize Thiessen Polygons. I downloaded the zipped file, unzipped to a folder where I keep GIS tools. Added to my list of tools in Pro Catalog and opened from there. I hope this gives encouragement to others to try this tool.

VincentLaunstorfer

I finally took some time to try out the Five Color Tool.

In ArcGIS Pro 2.0 it produced an error whereas in ArcGIS Desktop 10.5.1 it worked well. Although the tool did not behave as expected. Ii only calculated integers from 0 to 3, just like if integer 4 was not existing!

However, as shown below, is there anything wrong with the geoprocessing framework (Python in particular) in ArcGIS Pro? Or any wrong settings on my machine?

DanPatterson_Retired

I haven't seen except

http://www.arcgis.com/home/item.html?id=5fa04ce288284c999f70464e1c3b2e82

that even remotely mentions color and Pro... but the search engine of Code Sharing site isn't very good

VincentLaunstorfer

Thanks Dan, but nothing more for the 4-color style, apart from a few comments at the end of the article. I wonder if there is a new script for ArcGIS Pro 2.0 (or ArcGIS 10.5.1) to compute integers in a field of a polygon file which are then used for symbolizing 4-color style...

DanPatterson_Retired

From a blog post a couple of years ago on the 'new' colors in Pro

And for those interested in color ColorBrewer site

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