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DEM has 'grid' distortion to it, and makes the calculated slope map for it unusable.

Question asked by quantumsawdust on Nov 10, 2012
Latest reply on Nov 12, 2012 by jskinner-esristaff
I'm sure this question has come up before, but I can't seem to find it. I'm not entirely sure what to search for.

I am using ArcGIS 10.0

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I have a DEM of a coastline. As you can see in the attached image, it has a grid overlay to it. If I understand correctly, this is because it was calculated via nearest neighbor? That's not so important since I don't have the original data, only the resulting DEM - the grid is annoying, but if I zoom in on any part of the grid the "line" shrinks, so it doesn't actually seem to impact any of the elevation data points. So I can live with it.

However!

When I create a slope map, these "infinitely thin" grid lines suddenly become quite large, and ruin the data. The second attached image should show what I'm dealing with (in this case, it's a curvature map). I'm using Spatial Analyst -> Surface -> Slope.

[ATTACH=CONFIG]19196[/ATTACH]

I have a hard time believing there isn't a workaround for this, but I just have no clue what it might be. If anyone could help me out, I would be almost infinitely grateful.

Regards,
David

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