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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?

Thanks!

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

http://www.cabnr.unr.edu/weisberg/downloads/polygons_within_polygons.pdf

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  • Have you tried just using Union followed by Summary Statistics?
    – PolyGeo ♦
    Commented Mar 19, 2013 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
    Commented Mar 19, 2013 at 13:01
  • Perhaps it is better to wait until i get an Arcinfo license and split it
    – user13641
    Commented Mar 19, 2013 at 13:26
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    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
    Commented Mar 19, 2013 at 15:25

1 Answer 1

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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
    Commented Mar 19, 2013 at 14:59
  • The areas of the intersecting polygons should be calculated in the "Shape_Area" field of the Intersect Output already.
    – rr5577
    Commented Mar 19, 2013 at 15:11

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