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Posts: 29
Registered: ‎10-15-2018

z Value Of DEM

How can I adjust the z value of an DEM using GCP.

Technical Evangelist
Posts: 946
Registered: ‎10-01-2015

Re: z Value Of DEM

Hi monde,


So you're not looking for a simple transformation between vertical datums (for which a dedicated tool exists)?


If not then personally I'd look at the Linear Regression operator to set up a relationship between your known height locations and the surface values. Then apply that equation to the surface to map it to heights.


Similar to this example:


Hope that helps.






Ian Anderson
Chief Product Owner, Desktop Remote Sensing
Hexagon Geospatial
Technical Evangelist
Posts: 644
Registered: ‎02-02-2016

Re: z Value Of DEM

If you only want to change the Z value for a single pixel in your DEM you could use the Area Fill tool. The article linked below provides instructions to perform this task.


Manual editing of pixel values


Please be aware that in your case the Area Fill tool may be found under ERDAS IMAGINE’s Panchromatic tab or Thematic tab or instead of the Multispectral tab referenced in the article.


Kind regards,


Stephen Bent

Hexagon Geospatial Support