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Re: AVHRR Image Mapping Problem [message #51976 is a reply to message #51852] Sun, 17 December 2006 18:46 Go to previous messageGo to previous message
Richard French is currently offline  Richard French
Messages: 173
Registered: December 2000
Senior Member
On 12/17/06 3:36 PM, in article MPG.1fef584c7fc06f23989e53@news.frii.com,
"David Fanning" <news@dfanning.com> wrote:

> I wouldn't be too hard on iMap. I believe now the problem
> isn't an IDL problem at all. I think the center of
> the pixels is just NOT what the documentation says they
> are.


David,

If one trusted the data headers from Hubble Space Telescope images as a
guide to where the spacecraft was actually pointed, one would be up to 10
pixels off - that's because what's listed in the header is where they
expected to be pointing, not a reconstructed view of where they were
actually pointing. The same is true of Cassini images of Saturn. I don't
know about Earth-pointing satellites, but unless one has done some pretty
accurate post-image checking, it is not obvious to me that the header
information for such an image would have anything other than the predicted
location of the image, and you need to find out from experience (or
preferably from the spacecraft/instrument teams) what the actual pointing
performance is likely to be. Two pixels sounds like reasonable jitter if it
is a predicted pointing location.

Dick French

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