In QGIS 3.2 I have a viewshed raster and a shapefile with point features
I'd like to select the points that intersect the visible areas of my viewshed.
Is there a way to extract a vector of my visible areas so that I can then Select by Location?
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1 Answer
One option would be to extract the pixel value at each point and then perform a select expression to identify points in viewshed, see q/a link below:
Extracting raster values at points using Open Source GIS?
Another option would be to convert raster to polygon using the Polygonize tool and perform select by location:
answered Nov 21, 2018 at 15:33
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Right, but that gives you a vector of the visible & non-visible areas of the viewshed. I ended up doing this and then my next step was to manually select the 'visible' features of that vector to create a new 'visible only' layer. (Currently Select by Location is processing). Is that really the way to do it or is there a better alternative?– belegretCommented Nov 21, 2018 at 15:47
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