I am creating contours from an Aster DEM in ArcMap 10.1
I see a grid pattern appearing, particularly in areas of dense contours:
I see the same artifact if I create a Hillshade layer so presumably it is a problem in the DEM.
The grid artifact doesn't correspond to the sample size of the DEM.
I am using the original DEM - no resampling or focal statistics.
The DEM has not been reprojected (displayed in the WGS84 UTM projection it was delivered in).
Any ideas about the cause of the artifact?
If so could anyone suggest a workflow (other than resampling/ focal statistics) for removing it?