DEM quality

Question

Hello everyone. I merged several DEMs to make a map for a watershed. However, the quality seem off, showing some weird grid lines when I try to make any transformation. For example here is when I try to convert into slopes (notice the lines?) How can I fix this?

Thank you,

Stéphanie

ThomasHamill · Answer

@StephanieParadis, were you able to work through the problem with your DEM?

ThomasHamill · Answer

@StephanieParadis, this usually happens if the Pixel Type (8 Bit unsigned integer, 32 Bit float, etc.) Projection, or File Format with Extension (Erdas Imagine/.img, GeoTiff/.tif, Jpeg/.jpg) changes between the source datasets and the final result during a mosaic.

Have you checked to make sure your resulting mosaic raster has the same properties as the input datasets?