Relative elevation models (REMs; also referred to as detrended DEMs) are extremely useful for river analysis. And they make really cool visualizations and maps. This tutorial will demonstrate how you can make and display REMs for FREE using QGIS.

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Step-by-step instructions: https://opensourceoptions.com/blog/cr...

This video was adapted from this article: https://dancoecarto.com/creating-rems...