topic Re: Hillshade displaying contours (smoothing is not working) in ArcGIS Spatial Analyst Questions

Hillshade displaying contours (smoothing is not working)

ChristopherScarpone — Mon, 17 May 2010 18:48:06 GMT

Hi,

I have made a hillshade feature class from a raster. This raster was based off 5m contour lines. The hillshade is made and works fine, however it is displaying every different contour line that makes up the feature class when zoomed in closely. I have reclassified the raster to bilinear and cubic, smoothed the raster using Spatial Analyst Tools/Neighbourhood/Filter with low setting and high setting, but im still getting the same results.

Any suggestions?

Re: Hillshade displaying contours (smoothing is not working)

ToreBorvik — Tue, 18 May 2010 10:57:16 GMT

did you make the hillshade from a floating point raster or integer? using floating point rasters as source usually produce a little more aesthetic hillshade.

I've also experienced a few times that I more often end up "seeing" the contour lines if I use the spatial analysis toolbar instead of using the hillshade tool in the toolbox. I can't explain why though, but you could try it

Re: Hillshade displaying contours (smoothing is not working)

AlanToms — Tue, 18 May 2010 16:12:26 GMT

I have run into a similar issue and solved it but going to the Display properties and changing the Resample to Bilinear Interpolation. It does not change the raster itself, just how it is displayed.

Alan

Re: Hillshade displaying contours (smoothing is not working)

ChristopherScarpone — Tue, 18 May 2010 18:09:06 GMT

Thanks for the all the responses... turns out the DEM I was using was the problem, however everyone's responses helped to mitigate its effects.

Thanks

Chris