I'm a bit of a novice to QGIS, so apologies if this is a silly question:
I've scanned a geological map into QGIS, which shows different types of rock in different colours. It's a raster layer, and I'd like to have it work like the elevation layer I've imported from the USGS - that is, for each pixel to have a value (for example, 'chalk') so that I can then tabulate the type of rock on which various features are situated. How do I go about this?
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I've scanned a geological map into QGIS, which shows different types of rock in different colours. It's a raster layer, and I'd like to have it work like the elevation layer I've imported from the USGS - that is, for each pixel to have a value (for example, 'chalk') so that I can then tabulate the type of rock on which various features are situated. How do I go about this?
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