12-14-2016 03:29 AM
Assuming that I have a raster image (not georeferenced) and I have 4 control points (X,Y,Z), does Erdas have the capacity to georeference that image based on X,Y,Z? not only on X,Y?
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12-20-2016 11:16 PM
Thanks for your input, could you please provide me with anything that might help to start? Any documentation or articles may be a great help of me
12-20-2016 12:32 AM
12-20-2016 04:55 AM
Thanks for your help and support, I had the chance to look at the documentation, then I come up with the following procedure, Please have a look at it and correct me if I am wrong
12-20-2016 05:23 AM
That is the correct procedure. Please be aware that at least 6 GCPs points are needed to solve the DLT model. This 3D model requires that GCPs are well distributed across the image horizontally and vertically. After the model is solved you should check your RMS error before resampling.
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12-22-2016 03:38 AM
Thanks Guys, this was really helpful, I have attached a manual that I have developed for knowledge sharing, but I wonder if I can show the Z value for the georeferenced image just to make sure that everything is ok.
12-22-2016 06:35 AM
Nope, you can't. However, using the z values should have helped constrain the model so checking the x,y coordinates (prefereably against stand alone check points) will show you the true accuracy of your georeferencing.