| Error in georeferencing using map_patch? [message #37422] |
Thu, 18 December 2003 11:10  |
willmccarty
Messages: 3
Registered: December 2003
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Junior Member |
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I'm working with a 30x90 array that is basically representative of a
50km satellite footprint. In displaying the image, I noticed that
they seem to be slightly off (coastlines apparent in the image, for
example, don't line up with coastlines mapped by IDL). I'm trying to
figure out a simple answer, though. I'm sure my code is correct, so
I'm not to worried about that. I'm just curious, since I'm applying a
small array to a large area (the image corresponds to, basically, a
very large meridional portion of north america), how the map_patch
program handles the referencing of each point to a given latitude and
longitude. The given lat and lon correspond to the center of the
pixel. Is this how map_patch applies it? i'm basically trying to
figure out if it is an error in idl or in the georeferencing of the
data? Lets see what else. I'm using a lambert projection.
Georeferencing was not done by me, but came with the dataset.
Thanks for some insight.
Will
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| Re: Error in georeferencing using map_patch? [message #37509 is a reply to message #37422] |
Fri, 19 December 2003 02:31  |
Chris Lee
Messages: 101
Registered: August 2003
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Senior Member |
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In article <ed54c901.0312181110.753ca81f@posting.google.com>, "Will
McCarty" <willmccarty@knology.net> wrote:
> I'm working with a 30x90 array that is basically representative of a
> 50km satellite footprint. In displaying the image, I noticed that they
> seem to be slightly off (coastlines apparent in the image, for example,
> don't line up with coastlines mapped by IDL). I'm trying to figure out
> a simple answer, though. I'm sure my code is correct, so I'm not to
> worried about that. I'm just curious, since I'm applying a small array
> to a large area (the image corresponds to, basically, a very large
> meridional portion of north america), how the map_patch program handles
> the referencing of each point to a given latitude and longitude. The
> given lat and lon correspond to the center of the pixel. Is this how
> map_patch applies it? i'm basically trying to figure out if it is an
> error in idl or in the georeferencing of the data? Lets see what else.
> I'm using a lambert projection. Georeferencing was not done by me, but
> came with the dataset. Thanks for some insight.
> Will
Try getting IDL to plot a few points near some other known locations, on
the equator say, or the southern tips of Africa and South America , find
out what the georeferences of the coastline should be from a map.
(The answer to your question is "I don't know" :)
Chris.
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