| Projected Image Data [message #29536] |
Wed, 27 February 2002 15:55  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
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.
Thanks,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Projected Image Data [message #29660 is a reply to message #29536] |
Thu, 28 February 2002 08:05  |
James Kuyper
Messages: 425
Registered: March 2000
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Senior Member |
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Liam E. Gumley wrote:
...
> 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.
I'm looking forward to that; I've been spending most of the last month
developing an IDL widget-based application (specialized for my own
particular needs) for mapping MODIS image data.
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| Re: Projected Image Data [message #29663 is a reply to message #29536] |
Thu, 28 February 2002 07:47 |
K. Bowman
Messages: 330
Registered: May 2000
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Senior Member |
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In article <MPG.16e71fd78ddf401f989826@news.frii.com>,
David Fanning <david@dfanning.com> wrote:
> Folks,
>
> 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.
Have you tried the netCDF web site and mailing list?
http://www.unidata.ucar.edu/Community.html
Many netCDF users don't use IDL, but there may be existing standards
for satellite images.
Ken
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| 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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