why there is a sharp terrain scenery

[mingweiLIU]

Hi. I have built CTB by Visual Studio 2015 with GDAL2.0.1, then use CTBtile to tile my DEM data with command -o XXX XXX.tif. The tool worked great while it appears a sharp scenery in CesiumJS which is not that much smooth with it in arcglobe, I am not talking about the sharp boundary but the area with some real data such as a hill will look like a pyramid. The original data is in WGS84 coordinate. I don't know if there are some restraints for input data such as supposed bits or there are something else I have left out?

[dg3feiko]

My case is like this, the edges are spikes

[mrgloom]

@dg3feiko I have such problem when zero values in DEM were not equal to zero.

[mingweiLIU]

Thanks for reply. yes, it is, especially at the eage of each raster. This could be fixed through raster calculator in ArcToolbox.

[helmi03]

I use http://www.gdal.org/gdal_fillnodata.html

[gaolizhou]

@helmi03 could you share the details. It seems lots of guys suffers from this issue.

[helmi03]

For my use case, I only interested with data above sea level. I have same 'spike' issue as @dg3feiko , and found out error caused by DEM value < 0, same as mentioned by @mrgloom.

My first try, reprocess the geotiff with http://www.gdal.org/gdal_fillnodata.html. But have issue with nodata on sea surface.

Since I don't care below sea level, reprocessed the geotiff using "set values of zero and below to null" as http://www.gdal.org/gdal_calc.html

[mrgloom]

Is there any smart way to process DEM with no-value and zero values (not setting no-value to zero)?

[emrebayramc]

I have a fix for this problem:
#49

[mrgloom]

Before my DEM.tif have NoData Value=0 and now NoData Value=-100 and it doesn't work.

@helmi03
gdal_fillnodata.py DEM.tif DEM_2.tif not hepled, can you specify full example? Also maybe with gdalinfo before and after applying gdal_fillnodata.py?

@kazanture
How to apply this fix? Just git clone https://github.com/kazanture/cesium-terrain-builder ?

[emrebayramc]

The best way is the repo owner to accept my pull request. Until that time you can either clone my fork or apply my small fix manually.

[ajinra020307]

My case is like this, the edges are spikes

iam having this same issue, did you find any fix?