I have a SRTM 30m DEM of my area. I want to create a physical 3D terrain map from it (from felt, 3D printer, you name it). I have two questions about this process:
With grass r.contour I created contour lines from the DEM, and with v.generalize I smoothed the contour lines. Some of those contour lines still have gaps in them though. How can I make those contour lines smoother and interpolate in between so that two isolines that have the same elevation and have a 10m gap between them, are actually connected.
And more importantly, I would like to know how I can make polygons that correspond to the whole surface area with that height, so I can print those polygons (and cut them from felt, or input them in a 3D printer) to create polygons that I can stack on top of each other and create a 3D terrain map. How can I do this? I already have the isolines, the land outline and the bounding box outline for my area. I just need to somehow connect the isolines to the bounding box and land outline to create a polygon, for each isoline.
Any suggestions? I mainly use grass and qgis, but any other FOSS package is fine as well.