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Projected Image Data
| Re: Projected Image Data [message #29665 is a reply to message #29536] |
Thu, 28 February 2002 07:43  |
Liam E. Gumley
Messages: 378
Registered: January 2000
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Senior Member |
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David Fanning wrote:
> Do any of you netCDF-types know of any "standards"
> regarding how to store already-projected satellite image
> data in netCDF files? Are lat/lon points typically
> stored with the image, or just metadata that allows
> you to navigate the image? We are looking for some
> ideas that make sense. Most of the images we are
> working with have already been projected into two
> or three specific map projections.
You can search the discussions among netCDF users at
http://www.unidata.ucar.edu/packages/netcdf/
See "Searches" towards the bottom of the page. Try searching for
"satellite" or "projection".
That said, I'm not aware of any well documented open (i.e. non
proprietary) standards for describing a satellite projection in a netCDF
file. I believe GeoTIFF provides some of these features, and someone in
the GIS field would have a better understanding of that subject than I
do.
I'm always happiest to work with satellite data where a lat/lon has been
defined for each pixel, and the satellite data remains in the native
"sensor" projection. Then I am free to resample it to whatever map
projection I choose. Lately I have been using some very nice C routines
from the National Snow and Ice Data Center (NSIDC) for this purpose:
http://eosdb.ssec.wisc.edu/modisdirect/
One of these days I intend to write up a guide to remapping satellite
images using the NSIDC routines in conjunction with IDL.
Cheers,
Liam.
Practical IDL Programming
http://www.gumley.com/
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