DWG file that contains couple of layers, among others I have
"elevations" layer (that consists of only 80 points) and
"contours" layer that can be seen on the images below. My goal is to make DEM from any resource that would be suitable to accomplish this task.
In the above image you can see
Elevations + borders layer, and in the below one can see
Elevations + contours + borders layer.
I don't have any CAD installed so I am using online software to read file and also to convert it to dxf. When I converted file to dxf and opened it in QGIS I could only see elevations of points but not contours in attribute table (I assume that even this bigger black elevation on the image above 91.00 is missing). Any kind of interpolation that I was doing in QGIS (How can I create a DEM from Point Data) didn't gave me result which would be similar to the contours that I already have in
dwg file. I was also trying to do something in Surfer v.8 at first and I wasnt satisfied with result at all, and in Surfer v.13 I was given a notice that I have inssuficients number of points. I guess the real problem is that I have really only 80 points that dont represent good enough terrain but maybe I am wrong. Then I am wondering how did the dwg file creators made contour lines.
Should I continue searching for solution to this problem or should I start searching how to join elevation attributes to the contour layers (by calculating them manually or any other approach that anybody suggest) and try to make DEM from it?