topic Re: Looking for tool to calculate difference in attribute values in Spatial Data Science Questions

Looking for tool to calculate difference in attribute values

MalcolmLittle — Mon, 07 Oct 2019 17:18:50 GMT

Hello,

I have two feature classes of hexagonal polygons, both derived from a universal coverage of hexagons, both containing values for the exact same attribute.

What I'd like to do is create a new polygon feature class that contains the difference in absolute value for the attribute for each hexagon. E.g. a Manhattan polygon containing the 1990 population attribute (1,487,536) compared to a Manhattan polygon containing the 2010 population attribute (1,585,873) outputs to a third Manhattan polygon containing the difference in population (98,337).

Looking for a tool or function that performs this kind of Feature math (akin to Raster Math).

Re: Looking for tool to calculate difference in attribute values

GeoJosh — Mon, 07 Oct 2019 20:03:23 GMT

Hi Malcolm,

Do both feature classes have a unique identifier? If so, you should be able to join the two feature classes based on that field, export it to a new feature class, create a new field, and use the field calculator the find the difference in values.

Best,
Josh

Re: Looking for tool to calculate difference in attribute values

DanPatterson_Retired — Mon, 07 Oct 2019 23:39:36 GMT

And if you really need the 3rd featureclass... export the resultant as the difference featureclass