richard_s

Grid overlay and spatial calculations help!

Discussion created by richard_s on Mar 23, 2013
Latest reply on May 3, 2013 by richard_s
Hi everyone,

I have a dataset that contains polygons over a large area with individual attribute values assigned to each, I want to:

- overlay a grid on top of the polygons layer

- calculate a value based on the individual value each polygon is assigned and the percentage of coverage it has within each cell
  i.e.

  polygon 1 = 3.3
  polygon 2 = 2.2
  polygon 3 = 1.5

  polygon 1 = 25% coverage within cell 1,1
  polygon 2 = 25% coverage within cell 1,1
  polygon 3 = 50% coverage within cell 1,1

value of cell 1,1

3.3/100 * 25 = .825
2.2/100 * 25 = .55
1.5/100 * 50 = .75        =      .825 + .55 + .75 = 2.125

- Assign the calculated value to that grid cell.

If anyone could give me some input into how i can go about doing this it would be much appreciated!

Thanks!

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