cici2012 Posted April 19, 2012 Share Posted April 19, 2012 I need help 1) To do volume calculations do you have to insert the second surface into the first before you start? 2) When I am inserting the second file there is an error message that points of the same number has been found. This I believe is because all points start from 1 onwards. Is that the problem? Quote Link to comment Share on other sites More sharing options...
Tyke Posted April 19, 2012 Share Posted April 19, 2012 You have the two surfaces as separate DTMs, then create a differential DTM in which you identify the original surface and the surface to be used to calculate the volume. In the end you have three DTMs. Quote Link to comment Share on other sites More sharing options...
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