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I have a nice DEM, created from UAV data, which I want to process further in QGIS, my platform of first choice. In order to represent the evelation of each pixel correctly, I have to adjust the 'elevation adjustment parameters' like Z-scale and Z-offset. In Globalmapper, I was able to do it. Also in the manual of ArcGIS, it is discussed (http://resources.arcgis.com/en/help/main/10.1/index.html#//009t0000003t000000).

I do, however, not encounter the way how to do it in QGIS. Does have anyone a clue or advice on how to do that in QGIS?

Many thanks,

Arnoud Cuppens

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Out of curiosity, which software did you use to generate the DEM from the UAV photos? –  markusN Mar 20 '13 at 23:35

1 Answer 1

That depends on what you want to do. For example, the Relief tool lets you define the Z factor:

enter image description here

http://underdark.wordpress.com/2012/01/19/a-guide-to-beautiful-reliefs-in-qgis/


Update:

If you need to apply the corrections only once, you can use raster calculator.

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Thanks for the quick reply. The DEM is generated based on a series of UAV photo's using a cloud solution. With the DEM, they give following parameters in order to represent correctly the height of each pixel: Z Altitude Offset (m): 55.6382493318075291 DEM Z Scale (m): 0.15172011985822564 –  Arnoud Cuppens Mar 19 '13 at 18:06
    
I'm not sure I totally understand what that means, but could you just use the raster calculator to apply those corrections once? –  underdark Mar 19 '13 at 18:08
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Many thanks, I was able to do it with the rastar calculator. Same results as in globalmapper were obtained. –  Arnoud Cuppens Mar 20 '13 at 20:07
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@ArnoudCuppens Please upvote helpful answers and accept the answer if your problem is solved. –  underdark Mar 20 '13 at 20:11

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