I'm a water resources engineer with literally zero GIS experience. I'm working as a volunteer on a Engineers Without Borders project delivering safe drinking water to a remote community, where my team has provided me GPX files for point of interest, tracks, and LiDAR contours.
In order for me to use the QEPANET plugin (to build a hydraulic water distribution model), I must first add a DEM. The problem: I don't know how to take my LiDAR GPX file and make a DEM out of it, and afterwards, superimpose the points and/or tracks on that DEM.
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