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Need GOES Image Expert [message #59294]

Mon, 17 March 2008 13:32

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Folks,

A quick question for a GOES image expert. Are the GOES
satellite images, such as can be found here:

http://goes.gsfc.nasa.gov/goeseast-lzw/peru/

in some kind of map projection? Where can I learn about
these images? The GOES folks don't seem to be making this
information obvious. :-(

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: Need GOES Image Expert [message #59355 is a reply to message #59294]

Fri, 21 March 2008 05:28

Bruce Bowler
Messages: 128
Registered: September 1998

Senior Member

On Thu, 20 Mar 2008 22:30:56 -0600, David Fanning wrote:

> do you think anyone has old copies of those web pages? Some
> Goggle Archive somewhere? Could we piece it together over lunch
> sometime?

Have you tried the "wayback machine"?

http://www.archive.org/web/web.php

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Re: Need GOES Image Expert [message #59357 is a reply to message #59294]

Thu, 20 March 2008 21:30

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Mark Conner writes:

> Bottom line is that it's not an easy solution.

I'm going to file this article under the category of
"Too Much Information". Goodness!

But I do appreciate knowing where to put my hands
on it when it comes to either this or joining the
penitente monks down in New Mexico.

I did manage to get the MAP_PATCH solution working
well enough for my purposes, but I would *love*
to resurrect Kelly Dean's TRIGRID, POLY2D and POLYWARP
solutions. (Odd that so much religious imagery is
coming to mind, but I guess Easter is almost
here.)

Kelly, do you think anyone has old copies
of those web pages? Some Goggle Archive somewhere?
Could we piece it together over lunch sometime?

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: Need GOES Image Expert [message #59411 is a reply to message #59294]

Tue, 18 March 2008 13:47

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

> I'm looking for drugs or ideas, either one will do.

I think the final solution might be smaller IDL graphics
windows. I'm beginning to see the wisdom of wanting to
enclose IDL graphics windows inside the confines of the
IDL Workbench.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: Need GOES Image Expert [message #59412 is a reply to message #59294]

Tue, 18 March 2008 13:39

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Kenneth P. Bowman writes:

> There goes my chance for fame. :-(

Well, hang on. There's still trouble in River City,
and it rhymes with "p", and it stands for "projection".

I got a little too excited before. :-)

It's pretty good. Not bad. But not bang on right, either.

If I open a GeoTIFF file like this AVHRR file here:

http://www.dfanning.com/map_tips/tiffoverlay.html

Then I can find the UV bounding box by using the tie-points,
the scales, and the size of the image:

s = Size(image, /Dimensions)
xscale = geotag.ModelPixelScaleTag[0]
yscale = geotag.ModelPixelScaleTag[1]
tp = geotag.ModelTiePointTag[3:4]

xOrigin = tp[0]
yOrigin = tp[1] - (yscale * s[1])
xEnd = xOrigin + (xscale * s[0])
uv_box = [xOrigin, yOrigin, xEnd, yEnd]

This assumes that the image is "squared-up" with the UV
coordinate system.

Unfortunately, my image is NOT "squared-up" with the UV
coordinate system. It is tilted a little bit. Here are
the four corners of my warped image in UV space, after
I warped the lat and lon arrays and converted the corner
points to UV space. (Starts in lower-left and goes clockwise.)

-2361218.9 -1869566.0
-2373277.4 1841973.4
2360269.4 1842014.4
2348276.6 -1869524.8

Thus, when I try to treat it as if it were the AVHRR image
above, I *almost* get it right, but not quite. I think I need
some way to "square up" this image with the UV coordinate system.
Unfortunately, it is not a simple rotation, because the image
itself is not a rectangle in this warped space. It's a
squarish blob. :-(

I'm looking for drugs or ideas, either one will do.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: Need GOES Image Expert [message #59509 is a reply to message #59355]

Fri, 28 March 2008 08:21

KRDean
Messages: 69
Registered: July 2006

Member

On Mar 21, 6:28 am, Bruce Bowler <bbow...@bigelow.org> wrote:
> On Thu, 20 Mar 2008 22:30:56 -0600, David Fanning wrote:
>> do you think anyone has old copies of those web pages? Some
>> Goggle Archive somewhere? Could we piece it together over lunch
>> sometime?
>
> Have you tried the "wayback machine"?
>
> http://www.archive.org/web/web.php

Those were the days.....

http://web.archive.org/web/20040113130116/http://www.cira.co lostate.edu/special/csuidl/IDLremap0.htm

Kelly Dean
Fort Collins, CO

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