How to run a spatial query with a raster and vector layer in QGIS?

Question

I have a soil map (vector-polygon layer) and a map of the crops farmed in the same area (raster layer, from the US Cropland Data Layer).

I would like to calculate for a given soil type, the surface farmed per crop. How do I do that?

The Zonal Statistics and ZonalStats plugins didn't solve my problem.

Hope I am clear enough. Thanks

HeyOverThere · Answer 1 · 2012-11-22 15:34:28Z

up vote 1 down vote

You can use the Raster to Polygon tool in QGIS's Raster menu. Then you can run an intersection to get a cropland / soil layer.

answered Nov 22 '12 at 15:34

HeyOverThere
2,226310

Sunil · Answer 2 · 2012-10-23 12:23:02Z

up vote 0 down vote

May be you can try to write your own custom script .. Following link will be good resource for you http://planet.qgis.org/planet/user/3/tag/quantum%20gis/

answered Oct 23 '12 at 12:23

Sunil
1,8882428

How would this custom script work? What functions, specifically, do you suggest to use? – Simbamangu Oct 23 '12 at 14:46

1

Thanks! Could you give more details about the script you think I should write? I confess I don't know where to start. – Bap Oct 25 '12 at 19:23

2 Answers