Density to Percentage

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01-15-2019 04:08 PM
NathanFleischman
New Contributor III

I am trying to figure out how to convert density to percentage in ArcGIS. I was wondering if anyone had any idea on how to do it?

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DanPatterson_Retired
MVP Esteemed Contributor

Density is the ratio of  … quantity of something / area that delineates something... for example  

the Number of people/ square kilometer

Percentage is the ratio of …

something/total number of somethings  ….   for example

children in the room/total number of people * 100

density and percentage can only be related when you are talking about the...  the number of areas off something relative to the total area of all somethings....

… the number of houses / town area (this is density) ...… versus....    total area of all houses / town area (this is percentage/ratio)

        

so what are you working with? 

Consider 1 house on a building lot... the area of the building lot is 1 acre (43560 ft^2)  the house is 1000 ft^2

The density is 1/43560.... the percentage is 1000/43560

two different things

NathanFleischman
New Contributor III

How do I get that total area of all somethings?

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DanPatterson_Retired
MVP Esteemed Contributor

you use the Calculate Geometry in the field calculator within a table.

or Add Geometry Attributes—Data Management toolbox | ArcGIS Desktop 

similar tools exist within arcmap and ArcGIS pro

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