[gdal-dev] Slope obtained with GDAL has weird lines

[Michael Patrick]

>
> *> I am working with this DEM obtained using terraincache
> <https://pypi.org/project/terraincache/>, it uses mapzen data. The SRC is
> WGS 84. ...   Does anyone have an idea of how to solve it? *
>

Get better elevation data ... you didn't mention where in the world you
are, but if you tell me, I can probably make some suggestions.



> *> Ah, let me guess. The dem grid was interpolated from contour lines and
> you seeing the contours again.*
>

Can confirm, and they used a fairly crappy interpolation method also, it's
not just terraced, it's wrinkled along the contour lines.

Michael Patrick
Data Ferret

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