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Re: Map Projection Knowledge Growing Exponentially [message #48580 is a reply to message #48579]

Fri, 28 April 2006 12:55

mattie
Messages: 4
Registered: January 2006

Junior Member

David Fanning <davidf@dfanning.com> writes:

> But I wonder if anyone has an image data set to share that
> has associated lat/lon values for each pixel? Or, at least,
> a pointer to a location where I might download such a data
> set.

Here's two data sets for you.:

AMSR-E/Aqua L2B Surface Soil Moisture, Ancillary Parms, & QC EASE-Grids
http://nsidc.org/data/docs/daac/ae_land_l2b_soil_moisture.gd .html

AMSR-E/Aqua Daily L3 Surface Soil Moisture, Interpretive Parms, & QC
EASE-Grids
http://nsidc.org/data/docs/daac/ae_land3_l3_soil_moisture.gd .html

The data are in HDF-EOS format, so IDL supports that, it should be easy
to work with.

Of course I jest! The gctp projection hasn't been added to the gctp
library that IDL uses (or more likely, the projection hasn't been
updated into the map_* routines) , so it might be a little harder to
use:

gctp proj code:
GCTP_CEA (97) Cylindrical Equal-Area (for EASE grid with corners in
meters)**

But if you're just looking for a lat, lon, and a data grid with
projection information we can do that for a different gctp projection:

The Northern Hemisphere EASE-Grid Weekly Snow Cover and Sea Ice Extent
Version 3 is Available here: *under the "Access Data" link*

http://nsidc.org/data/nsidc-0046.html

After the link the data is in the directory 'data'. And under 'Tools'
there are files of the lat and lons of the grid cell centers. (LSB is
least significant byte)

File: NLLATLSB.GZ
File: NLLATMSB.GZ
File: NLLONLSB.GZ
File: NLLONMSB.GZ

And there's a page about the projection/grid EASE: All About EASE.

http://nsidc.org/data/ease/ease_grid.html

Have fun.

Matt

--
Matthew Savoie - Scientific Programmer
National Snow and Ice Data Center
(303) 735-0785 http://nsidc.org

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[Message index]

		Re: Map Projection Knowledge Growing Exponentially By: kBob on Sat, 29 April 2006 10:07
		Re: Map Projection Knowledge Growing Exponentially By: David Fanning on Fri, 28 April 2006 14:28
		Re: Map Projection Knowledge Growing Exponentially By: liamgumley on Fri, 28 April 2006 14:07
		Re: Map Projection Knowledge Growing Exponentially By: George N. White III on Fri, 28 April 2006 14:03
		Re: Map Projection Knowledge Growing Exponentially By: savoie on Fri, 28 April 2006 13:59
		Re: Map Projection Knowledge Growing Exponentially By: David Fanning on Fri, 28 April 2006 13:12
		Re: Map Projection Knowledge Growing Exponentially By: mattie on Fri, 28 April 2006 12:55

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