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I am currently trying to measure the area of polygons within each square of a fishnet. The aim of what I am doing is to work out the proportion of different agri-environment schemes by 1km squares. I have tried following the instructions in the pdf below but when it comes to the dissolve I get a 'warning empty output'. Any suggestions?


Using the intersect function creates the layer below and cannot be used to calculate area within squares

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Have you tried just using Union followed by Summary Statistics? – PolyGeo Mar 19 '13 at 12:30
Thanks, i have just tried that but it gives the sum area of the whole layer rather than by fishnet square. – user13641 Mar 19 '13 at 13:01
Perhaps it is better to wait until i get an Arcinfo license and split it – user13641 Mar 19 '13 at 13:26
I think you may want to dissolve your agri-schemes prior to the intersection/union. Then you wouldn't have multiple smaller polygons of the same type within each square and you could easily export/summarize area by class for each. – JWallace Mar 19 '13 at 15:25
up vote 6 down vote accepted

if you´re looking for something like this(labels denote area in sqkm): Intersect

You can just intersect the Fishnet with the Polygon Layer.

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Using the intersect function produced the layer i have posted in my question, I can't use this to calculate areas within the fishnet squares...Any ideas? Thanks. – user13641 Mar 19 '13 at 14:59
The areas of the intersecting polygons should be calculated in the "Shape_Area" field of the Intersect Output already. – rafaelr Mar 19 '13 at 15:11
Apologies! Thank you for your help. – user13641 Mar 19 '13 at 15:54

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