Orthorectification in Erdas imagine 11

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sir, i understand that while selecting an image you can attach a text file with the rational polynomial coefficents in it. what i would like to know is, the order of the coefficents. like the first coefficent corresponds to the lat long or height. can you please help me out regarding this?
thank you.

PranayRajG
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Thanks for the tutorial...of great help.I wanted to know if the imagery and DEM should have the same projection ?kindly reply!It's urgent.

kanikasikligar
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How you have obtained Geoeye data? can you suggest some open-access sources?

sumanc
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Do you have any idea as to how to perform Chi-Squared test in erdas for (change detection)

kanikasikligar
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Thanks for the upload, great tutorial... Please, can you explain me what is a RPC file, and how do i get it? Cheers from Colombia

estevanlermaingenierotopog
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Can you tell me how to do this using ERDS imagine 2014?

nameerakoser
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Can't we generate RPC file from any tiff or jpeg image personally??

jeevankutu
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Sir what abt Corona image who dont have RPC?

chetansingh