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Calculating % of a polygon in a shapefile

NiccolòGervasoni

Hi everyone,

I have a polygon (.shp) and a shapefile (.shp) and I would need to calculate the percentage of the polygon overlapping with the shapefile.

Someone suggested me to ude the Intersect function, but I can't figure out how.

Could someone tell me how to proceed, step by step?

thank you in advance!

Nebbiolo

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DarrenWiens2

The ideal tool would be Identity, but it's only available with advanced license.

Alternatively, first calculate the original area into a new field in your polygon file. Intersect it with the other file. This will leave you with a polygon showing only the overlap between the two files, but the attribute table will still hold the original area value. Calculate the new area into a new field. Calculate percent between original and new area.

NiccolòGervasoni

Hi Darren, thank you for replying. I can use Identity. How would you proceed with it?

DarrenWiens2

It depends exactly how your files are organized, but essentially you run the tool between your two files and calculate area.

NiccolòGervasoni

Got it. I have another problem. My shapefile "griglia4x4" is like this:

while I need it to be only one polygon, with only one area. How can I trasform it?

NiccolòGervasoni

Hi,
I used identity (but I also tried with intersect and it's the same).

Instead of getting a new polygon with its area in the attribute table, I get this:

I need to know the area of the intersect...

TedKowal

I am old fashion.... when I do overlapping percentages .. I use a semi-manual arithmatic process..... described here. This does work, although it does take time to work through the process.

arcgis desktop - Calculating percentage of overlap between two different layers - Geographic Information Systems Stack E…

Logic also works for polygons in one layer.

DarrenWiens2

Calculate the area of the yellow polygon into a new field. Calculating area, length, and other geometric properties—Help | ArcGIS for Desktop

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