Getting sharp edges on Cesium when using high resolution DEM

[Parthesh]

I have attached the snapshot of the result that I am getting with 10m resolution DEM (Cartodem-10m). Initially it was Float-32 type(for which I used bil-32 from geoserver), but even after converting to Int-16 type (and using bil-16 from geoserver) same issue is recurring. Also I am getting similar results when I am using SISDP-10m DEM. Currently, I am using Cesium-1.13 and Geoserver 2.8.0.
I referred to this issue(#7) which also consist of mention of similar problem, only in this case, the no. of levels while tiling the DEM seems to be more than sustainable(12-instead of 11). I used 4 levels and 512 x 512 as pixel size while giving the gdal_retile parameters. So, I increased the no. of levels to 11 and pixel size 100 x 100. Although there was reduction in the spikes but issue still remains. Please let me know the correlation between DEM resolution and parameters to be given while performing gdal_retile so that Cesium does not behave weirdly.

Thanks,
Parthesh B.

[kaktus40]

Hello could you read this closed issue

[Parthesh]

I just read it. Is it necessary to use your javascript code from the closed issue, because I am using int_16 type of tiff file with 10m resolution.

[kaktus40]

Hello,
your geotiff can be 32 bit float or 16 bit integer, It's not important.
The most critical parameters are in the definition of your layer: you
must configure BIL format settings in bil 32 if you want that geoserver
send 32 float data. In this case, you can use the code used in the
previous issue!

[Parthesh]

Thanks for the info.... I got the desired output. I used Float-32 type of DEM with Big Endian configuration in geoserver and its working fine. But the Int-16 version of same DEM is not working. It seems that there is a problem if we try to use high resolution DEM in 16 bit format.

[kaktus40]

That's normal: float-32 type is encoded on 4 bytes for each height and
it's decimal whereas integer-16 type is encoded on 2 bytes for each
height and it must be an integer between -32768 and 32767 meters!

[kaktus40]

Could you send me the new picture?

[Parthesh]

Sure, here it is...

[kaktus40]

thanks that looks good