My boss gave me a small 3D-point-shapefile and asked me to make an DEM from it, which I should put together with an older DEM of the same site, which was made with Surfer.
I created a raster-layer from the shapefile and used the contour-tool to create level-contours. Unfortunately they seem to be lines instead of polygons. When I use the tool line-to-polygon some of the levels disappear. I am sure there is a way to create a DEM from point-data, but I have no idea what I am doing wrong.
I use QGIS Valmiera.
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