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When importing a dxf contour file using TRex the following error is seen.
"Circular List Error Clockwise ..."
Or when importing contour shapefile, following error is seen,
For the first error, it is seen when the data in the contour file is misplaced, after correcting the data you should be able to import the dxf contour file using Trex.
Below things should be checked for these errors,
Using TRex
Error when using TRex: No Matching Data: All elements in the model fall outside the scope of the DEM.