From the course: Advanced QGIS Analysis with AI and Machine Learning

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Introduction to raster analysis

Introduction to raster analysis - QGIS Tutorial

From the course: Advanced QGIS Analysis with AI and Machine Learning

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Introduction to raster analysis

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Much of raster analysis in QGIS is a matter of converting raster files into other formats. For example, we can take a raster and convert it to points, vector or into polygons, also a vector. But those are just individual pixel sizes. We can also polygonize our data and turn it into polygons. We could also use terrain analysis where we can make contour lines and contour polygons. We can do hillshades, relief, slopes, and so on. So there's a lot of tools that take our analysis of a single raster and export it to another format. But some of the most powerful tools we have are under the Raster Calculator. The Raster Calculator lets us modify cell by cell, pixel by pixel, in many different ways. Now I could pick on an individual DEM and multiply it by anything. For example, if this DEM is bathymetry, I can simply multiply it by -1 and convert all that to minus values, below sea level. Or I can simply multiply it by another layer, say PARKS. Parks are zeros and ones. Basically, what I would…

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