Re: RPC Generation

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Re: RPC Generation
By georgetsig in ERDAS Software Forum

Hi ripon,

I am wondering if you have, so far, any result with the RPC generation. Unfortunately, I can't help you, but I am really interested in. Did you find any papers that concern this topic? Any information available could be very useful to me.

 

Thank you 

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Re: RPC Generation
By Tom Lobonc in ERDAS Software Forum

RPC generation creates a .uai file that is a pointer to another file.  IMAGINE will recognize the uai file as an image source, then extract the generated RPC coefficients from the linked file.  However this mechanism is internal to IMAGINE/LPS only.  At this time we do not have the capability to turn our internal storage format into the IKONOS formal text file that has RPC.  We cannot create the Digital Globe .RPB file either.  However, the originally intended workflow for this is to load the .uai file in the NITF exporter.  This will automatically grab the RPC coefficients from our internal format and write them into the RPC00B TRE in the NITF along with the imagery.  These can then be used by any software package that understands NITF with RPC00B.

As for papers, there is some guidance in the help about using the RPC generator.  However I have not yet seen any papers that go into great detail about the mechanism for generating RPC.  There have been some things published in the literature about generating them from control points (a BAD idea), but nothing that really dives into details such as the optimum distribution of the point cube, polynomail fitting mechanisms with coefficient de-emphasis, zero crossing detection, and so on.  Or at least nothing I have ever seen in public literature, only in internal or restricted documents.

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Re: RPC Generation
By georgetsig in ERDAS Software Forum

"There have been some things published in the literature about generating them from control points (a BAD idea)"   Why?

Could you forward please a link for papers with the topic?