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A vector layer represents geographic data whose features are given by sequences of points. (Contrast with a raster, which is a grid of values.)
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Clipping Error 1: Cutline polygon is invalid
I used the sample files located at this URL to learn QGIS:
https://qgis.org/downloads/data/.
I tried to clip SR_50M_alaska_nad.tif using a shapefile as a mask (alaska.shp). The problem is I g …