Problem with using dem data as a heightmap(terrain)

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08-16-2013 03:30 AM
KübraBilginol
New Contributor
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]
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MatthiasBuehler1
Frequent Contributor II
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

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MatthiasBuehler1
Frequent Contributor II
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
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by Anonymous User
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Original User: kbilginol

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