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

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Raster Calculator for simplification

Raster Calculator for simplification - QGIS Tutorial

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

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Raster Calculator for simplification

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The Raster Calculator is a great way to modify existing raster files, either one or more, to do an analysis or just to modify the data. Let's look at a raster file now. We're going to add the NANAIMO_DEM.tif. Drag and drop that in from your 3_Raster_Analysis folder. This is a digital elevation model that represents the elevation of the area. It goes from 0 to 465m above sea level. If you zoom in and choose the Identify Features tool, we could pick on each pixel and see what the value is. You can see here under Identify Results that the band changes as I pick on it. Now it's only a single band image, Band 1, so you can see that Band 1, the value of that one pixel, is 39, the one beside it is 40, and so on. You can see that the pixel values are changing. Now I happen to know that this is elevation. They're in meters above sea level. But this also could be bathymetry. So it could be negative, going beneath sea level. It could also mean property values or even contaminants. The values of…

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