topic Re: How do I map percentages within a polygon?? in ArcGIS Pro Questions

How do I map percentages within a polygon??

ErinMara — Thu, 10 Apr 2025 21:08:49 GMT

ArcGIS Pro v3.1

I have fertilizer usage data and want to visualize it at the county level. I've already calculated percentages of fertilizer type for each county (ie, each county is a whole unit with different types of fertilizer applied to different areas making the contributing percentage), but using a pie chart visualization gets really messy on a web map. I'd like to either make the pie chart fit to the county polygons (so it scales with the map during review) or fill each polygon with a percentage of different colors as specified in the table. I can't be the first person to want this, but I must not be using the right search words!

Re: How do I map percentages within a polygon??

DavidPike — Fri, 11 Apr 2025 21:13:08 GMT

What does the table look like (how many variables)?

1 variable - Choropleth works great (but it seems you have more than 1 fertilizer type)

2 or multiple variables - Bivariate or Multivariate Choropleth? Although Bivariate is probably the limit of easy conceptualisation for viewers.

Re: How do I map percentages within a polygon??

DavidPike — Fri, 11 Apr 2025 21:28:19 GMT

Also you could possibly use the following tools. Find the lowest common denominator, divide by that then merge the strips accordingly. Manual, but may work depending on how many polygons you have. I'd do a search for python scripts that do it all for you, some enterprising individual has probably done it already.

Subdivide Polygon (Data Management)—ArcGIS Pro | Documentation
Divide a polygon by a value—ArcGIS Pro | Documentation