Occasionally, you want to convert vectors to rasters to facilitate using raster analysis tools such as the raster calculator.
You'll need a vector layer; this can be a point, line or polygon layer. The best results generally come from polygon layers. We will use geology_wake2000reclass.shp
. This file is the result of the earlier clipping vectors recipe with a new column added that codes the geology types as integers. For reference, you'll also use elev_wake_500m.tif
as a matching raster for the area of interest.
In order to be useful in analysis, here's a checklist:
Is the vector data in the same projection as the rest of the raster analysis data? If not, reproject it first. Check the following URL for help, https://docs.qgis.org/2.8/en/docs/training_manual/vector_analysis/reproject_transform.html.
Clip the vector data to the analysis extent. You may need to convert a raster into a polygon mask to clip it (refer to the clipping vectors...