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ERDAS Inverted DEM Error

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Hi all I've been searching high and low for an answer to an issue I'm having with a DEM created in ERDAS LPS 2013, our DEM is completely inverted!

The river valleys are now ridges ~700m and the ridges are the valey bottoms ~300m!

 A screen shot is here


There are ten images in three flight lines with nine GCPs per image and ~16,000 tie points shared between all images.


Any help would be greatly appreciated, the ERDAS help and forums are completely useless!!



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