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Last Post 30 May 2008 12:22 PM by  anon
high errors and georeferencing
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anon



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30 May 2008 12:22 PM
    I'm trying to georeference some 50+ images and sometimes how much ever I try, Iget a high error about 10meters &more on the georeferenced image when I cross check in arc map. I could not find any camera callibration information for that set hence I have to georeference. Some times even when I pick a point I know for sure is the same one, my RMS value goes up and after playing with the points for a long while(a day or 2 sometimes) I finally try to warp the images and save them as tifs. I use RST bilinear 1 deg, or polynomial bilinear 1st degree for my transformation options but still get a high error. while selecting the points I try to keep my eerror to below 10 and tryto pick up atleast 15points. I dont know what to do and am lost now after putting in soo many hours. can anyone help me??

    MariM



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    30 May 2008 12:22 PM
    The RMSE associated with the GCPs are alll related. It is very possible to add a very good point and get a worse RMS error because one of the other points is causing the solution to be bad. You must closely check each GCPs and eliminate those which are causing the bad solution and this is sometimes a tedious process. First start with the GCP list and sort them based off their individual error. Then turn on/off individual GCPs looking how it affects the overall RMS error. This should help you narrow down troublesome points.
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