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I am trying to clip wind speed data (.shp format) to Canada's provincial boundaries (also .shp format). I am using the clip feature in vector > geoprocessing tools. For some reason the function always stops about three quarters of the way through and never completes the clip. See screenshot: enter image description here.

Has anyone experienced this before and is anyone aware of any solutions?

Thanks for your help!

Best,

Laura

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Is the wind speed data point data? I can't say what is going on in the geoprocessing, but a clip strikes me as a bit odd for point data (if that is indeed the case!). If the wind data is stored as points, maybe consider selecting by location all those data points within the provincial boundaries and then saving that selection as a new shapefile.

  • Yes, it is point data. The reason I am clipping with the point data is because I noticed when I clip the raster, the resulting raster file is shifted (I realized this when I overlaid the initial point data and discovered that it no longer fell at the centre of the raster pixel but rather to the top right.) As a workaround, I decided to clip the data in point form. – Laura May 30 '14 at 16:13
  • By the way, I am using the most recent version of QGIS - 2.2.0-9. – Laura May 30 '14 at 16:13
  • So if I understand correctly, you had wind speed data in a raster format and then converted the cells of that raster to points? – maptastik May 30 '14 at 16:19
  • Nope, in it it's original format it is point data. – Laura May 30 '14 at 16:20
  • I'm having a little trouble following what you're trying to do. From your original post it seems you have a wind speed layer as point vector data and you have a Canada provinces layer as polygon vector data. You want to derive a layer from your wind data that includes only those wind speed points within your provinces layer. What then is the raster you're referring to and why is it important to this operation? – maptastik May 30 '14 at 16:26

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