topic Problem with using dem data as a heightmap(terrain) in ArcGIS CityEngine Questions

Problem with using dem data as a heightmap(terrain)

KübraBilginol — Fri, 16 Aug 2013 10:30:20 GMT

Hi..

We have a problem with using georeferenced dem data (its format is geotiff). We opened the data in arcmap and viewed its heightness truely. (picture.1) Than we opened the data in cityengine as a heightmap and we couldn't see its heightness. (picture.2) Terrain was not shown. What is the reason of that? The data is attached. (We dowloaded the data from http://ws.csiss.gmu.edu/DEMExplorer/)

Thanks..

[ATTACH=CONFIG]26752[/ATTACH][ATTACH=CONFIG]26753[/ATTACH]

Re: Problem with using dem data as a heightmap(terrain)

MatthiasBuehler1 — Mon, 19 Aug 2013 12:06:19 GMT

hi !

there's some known issues in the DEM import in CE.

can you do the following :
1] check if all georeferencing metafiles are provided ( .prj & world file )
2] use the raster calculator [con()] here : http://resources.arcgis.com/en/help/main/10.1/index.html#//009z000000z7000000
to do the following:
a] replace all NaN (noValue) values with the terrain's official lowest point value (-36 in this case)
b] replace all 0 values ( exact zero ) with 0.01
Both 'noValue' and '0' values cause some issues in the import.
3] check that your terrain is set up correctly:
a] a terrain has a DEM (heightmap) path and a texture path. If you did not set the heightmap path correctly, if defaults back to no elevation ( flat.png )

let me know..

matt

Re: Problem with using dem data as a heightmap(terrain)

Anonymous User — Wed, 21 Aug 2013 13:50:19 GMT

Original User: kbilginol

I used the raster calculator [con()] and solved the problem 🙂 Thanks for your help... 😮