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You could: Simplify the geometries of your large polygon shapefile: Vector > Geometry Tools > Simplify Geometries... Select only those features from the large polygon shapefile which intersects the single polygon: Processing Toolbox > QGIS geoalgorithms > Vector selection tools > Select by location Then use these selected features for ...


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Your clipping fails because the raster has the odd nodata value of -3.4E+38. Unfortunately, you can not enter that value in the input form. So I suggest to use gdalwarp to change the nodata value and clip as well, but to the extent of the polygon layer: gdalwarp -overwrite -s_srs EPSG:32634 -dstnodata -10 -q -cutline forest_2013_extent.shp -...


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Your output needs to be either a shapefile or a geodatabase feature class. Currently you aren't outputting either: C:\Code\Module6\Bufferroads does not exist If this were a shapefile the output would be C:\Code\Module6\Bufferroads.shp, and if it were a geodatabase feature class the output would be something like C:\Code\Module6\output.gdb\Bufferroads ...


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My experience is that Mac is not working properly when combining vector with raster data. Raster calculations is not a problem but vector and raster is an issue. Sometimes it simply takes a lot of time and calculations are done. In other cases it does not work.


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The weak point seems to be at the single point. If you import it with Add delimited text, it is only a temporal layer, and has no CRS information written to disk. However, the clipping tool does not look into QGIS layer settings, only what CRS information is written on disk. So you better save the point to a shapefile with EPSG:3357, then proceed with the ...


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When you set the Keep resoltuion option to True, you enable two parameters (according to the documentation for gdalwarp which is used in this function): -tr - Sets the output file resolution in target CRS georeferenced units. -tap - (GDAL >= 1.8.0) (target aligned pixels) align the coordinates of the extent of the output file to the values of -tr, such ...



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