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I need to calculate/extract the number of jobs related to a determined/calculated surface (1 ha grid composed from 100 square meters per 100 square meters). I have 2 polygon layers (polygon 1 - values for number of jobs and polygon 2 - a grid with surface of 1 hectare=100*100 square meters). I need to extract and consequently distribute the values (number of jobs) depending on the amount/quantity of overlapping with the 1 ha grid.

The result could be a point data with:

  1. Only a equal distribution/extraction but 'clipped' for 100*100 square meter with the corresponding values after the cut/clip
  2. A detailed distribution related to the total surface with the overlapping of the polygon. In some cases it could by 100%, 90%, 80%, 20% etc. ....and so on depending on the area of overlapping. I've tried with centroids but it only transforms the whole polygon (maintaining the values) into a (single) point and I don't need that. I want multiple points with multiple/different values.

Any of the above scenarios are fine for my analysis.

I'm attaching an image here with the data:

polygons which need to be processed

Any further suggestions in QGIS environment?

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  • 1
    Calculate area, clip, calculate clipped area, calculate percentage - which step is unclear?
    – Erik
    May 24 at 11:17
  • 1
    You don't have an answerable question in this Question. It seems as if you expect us to do the intersection analysis and get back to you with results.
    – Vince
    May 24 at 11:24
  • Look at the overlap analysis tool. You could also run an intersect of polygons and grid polys, recalculate the areas, and put the data into a pivot table to get percentages or whatever other results you would like. You can join the pivot table results back to the intersected polygons, or to the centroids of the polygons.
    – John
    May 24 at 12:19
  • Do you want the result to be with respect to the grid layer or the jobs layer? For example, there is a grid square with a polygon with 6.19 jobs mostly in it, but there is also part of the 41.59 polygon in that grid square. Should these be calculated and added together for that grid square?
    – Tom Brennan
    May 24 at 12:20

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