I would like to create 20 meter contours for a large region, roughly 120,000 square kilometers. DEM data is available as TIFF or CSV throughout this region at 0.75 arc second resolution.
What tools should I use to create a coverage of 20 meter contours throughout this region? I am concerned that large file sizes will present a problem.
I have tried using the contour tool (Raster>Extraction>Contour). As well as the Contour Plugin which uses DEM point data as an input. I am running into trouble with large file sizes.
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