As I have already covered the creation of a layer stack using the merge function from gdal and I’ve found this great “plugin” OrfeoToolBox (OTB) we can now move one with the classification itself. I’ll show you how to obtain this in QGIS.
As I came across this short post about image classification in QGIS I was surprised to see this first line: “For this, Unsupervised KMeans image classification module from OTB has been used.” I haven’t heard about OTB and its usage in QGIS so I was curious.
In this tutorial I would like to show you, how to create a topographic map and analyse topographical data using freely available SRTM data and QGIS including some data manipulation. This is part one explaining how to get data, remove missing values, explore the relief and changing the color representation of a TIF file obtained by the USGS.