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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] Infrared Satellite Information |
| Date: |
01/17/2007 11:20:01 AM |
| From: |
Chris 'Xenon' Hanson |
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David, I apologize for the lateness of this reply. I missed your message when it was
originally posted, and only came across it while catching up on unread messages in my mail
folders.
David T. Hughes wrote:
> I need some advice/guidance/specifics on getting satellite infrared
> information. The objective is to try and trace a historic trail across the
> Oklahoma Panhandle (USA). I know nothing at all about satellite
> information, and less about Infrared satellite data. Can someone give me a
> quick source for how to find out what is available, what the wavelenghts
> involved are, who to contact to secure the information, and what the prices
> might be?
> Specifically, I would be looking at probably near IR to evaluate
> differential groundcover. Ideally a 1/9 second coverage would be the
> desired pixel size. I would then load that into ArcGIS Spatil Analyst to
> try and start finding patterns that might say trail.
> I tried the Eros Data Center web source, but have no idea at all what all
> the abbreviations mean.
I know several of the satellite imaging system have infrared capability (Landsat is the
best known, but others too) but frequently the issue with these is price/resolution. A
good solution for many locations is the NAIP imaging program, which is creating 1-2m
resolution imagery for almost every state in the US. In some states (like Colorado) the
imagery is natural color RGB. In others it is acquired in Color Infrared (CIR, which is
essentially IRG (Infrared, Red, Green). This is a great resource for vegetation analysis
because it is frequently available for free download via the USDA "Lighthouse" GIS data
server in county-sized MrSID images.
I don't know if Oklahoma is Cir or natural color, but if it's Cir, you basically are set.
Related: I make an inexpensive program for turning Cir Color Infrared imagery back into
nearly-natural RGB color:
http://www.alphapixel.com/products/pixelsenseCIR/
Unfortunately, that's the _reverse_ of what you want. :(
Good luck, and feel free to write me if you have any other questions about infrared
imaging.
> Thanks.
> Dave Hughes
> Newton, KS
--
Chris 'Xenon' Hanson, omo sanza lettere Xenon AlphaPixel.com
PixelSense Landsat processing now available! http://www.alphapixel.com/demos/
"There is no Truth. There is only Perception. To Perceive is to Exist." - Xen
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