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Data Set ID:
NSIDC-0145

CLPX-Satellite: AMSR-E Brightness Temperature Grids, Version 1

This data set includes Aqua Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) passive microwave brightness temperatures gridded to the geographic (lat/long) and UTM grids of the Large Regional Study Area (LRSA) of the NASA Cold Land Processes Field Experiement (CLPX).

Geographic Coverage

Parameter(s):
  • Microwave > Brightness Temperature
  • Microwave > Microwave Imagery
  • Microwave > Microwave Radiance
Spatial Coverage:
  • N: 42, S: 38.5, E: -104, W: -108.5

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 February 2003 to 31 May 2003
Temporal Resolution: Not specified
Data Format(s):
  • Binary
Platform(s) AQUA
Sensor(s): AMSR-E
Version: V1
Data Contributor(s): Mary Brodzik, Richard Armstrong
Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Brodzik, M. J. (ed.). 2004. CLPX-Satellite: AMSR-E Brightness Temperature Grids, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/3QWDLEGYBB0T. [Date Accessed].

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Detailed Data Description

This data set includes gridded passive microwave brightness temperatures. Data are provided for passive microwave frequencies at 6.9, 10.7, 18.7, 23.8, 36.5 and 89.0 GHz, separated by ascending and descending satellite passes, and include time files. Grid resolution is 25 km. The resampling method is inverse distance squared. Data are available in CLPX lrsa_geo720.0 and lrsa_utm25000 (see grid description). Temporal coverage is 1 February - 31 May 2003.

Format

There are 24 brightness temperature files per day for a given projection. Data are 2-byte unsigned integers, compressed, little-endian (i.e., PC or VAX) byte-order, representing temperatures in tenths of Kelvins. The fill value is 0.

There are two time files per day for a given projection. Data are 2-byte signed integers, representing minutes since midnight UTC. The fill value is -32768.

There are two geolocation files for each grid (geo and utm), with grid latitude and longitude coordinates. Data are 8-byte, little-endian, double-precision values, representing decimal degrees. File extension is .double.

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File and Directory Structure

Data are provided in a compressed (tarred and zipped) file named nsidc0145_amsre_vxx.tgz, where xx represents the data release version number. Within this compressed file, data files are in the following directory structure:

geo/
  2003/
     02/
       ID2-AMSRE-B01-LRSA_GEO720.0.01.2003032A.06H, etc.
     03/
     04/
     05/
lrsa_geo720.0.lat.23x18x1.double
lrsa_geo720.0.lon.23x18x1.double

utm/
  2003/
     02/
       ID2-AMSRE-B01-LRSA_UTM25000.01.2003032A.06H, etc.
     03/
     04/
     05/
lrsa_utm25000.lat.17x17x1.double 
lrsa_utm25000.lon.17x17x1.double
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File Naming Convention

The compressed file is named nsidc0145_amsre_vxx.tgz, where xx represents the data release version number. Individual data files are named ID2-AMSRE-B01-ggg.vv.yyyydddp.ccc where

ID2: Brightness temperature interpolation method - inverse distance squared 
AMSRE-B01: Source data - AMSR-E L2A version B01
ggg: grid name (LRSA_GEO720.0 or LRSA_UTM25000)
vv: 2-digit data version number 
yyyy: 4-digit year 
ddd: 3-digit day of year 
p: pass direction, one of {A(scending), D(escending)} 
ccc: channel/polarization or time, one of {06H, 06V, 10H, 10V, 23H, 23V, 36H, 36V, 89H, 89V, TIM}

For example, the file called ID2-AMSRE-B01-LRSA_UTM25000.01.2003150D.06H contains 6 GHz, horizontally-polarized brightness temperatures, descending passes only, for day 150 (May 30), 2003, gridded to the CLPX 25 km UTM grid, using an inverse distance squared interpolation method. The designator '.01.' indicates this is version 1 processing of these data.

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File Size

Total file size is 25 MB (uncompressed), 2.8 MB (compressed). Individual files are less than 1 KB.

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Spatial Coverage

The following map shows the CLPX LRSA:

Spatial Resolution

Latitude_Resolution: GEO720.0: 0.2 degrees
Longitude_Resolution: GEO720.0: 0.2 degrees
Latitude_Resolution: UTM25000: 25000m
Longitude_Resolution: UTM25000: 25000m

Grid Description

Geographic (GEO) Grid: 23 cols x 18 rows
UL: 42.05N, 108.55W
LR: 38.45N, 103.95W

Universal Transverse Mercator (UTM) Grid: 17 cols x 17 rows
UL: 42.16N, 108.93W
LR: 38.39N, 103.85W

Please see Geographic grid description and Universal Transverse Mercator grid description for lrsa_geo720.0 and lrsa_utm25000 grids, respectively.

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Parameter or Variable

Parameters presented in this data set are passive microwave brightness temperatures (Tb).

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Software and Tools

Quality Assessment

Selected brightness temperatures and time files have been visualized and manually inspected by data center operators before being archived and distributed.

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References and Related Publications

Contacts and Acknowledgments

Mary J. Brodzik
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449 USA

Document Information

DOCUMENT CREATION DATE

11 February 2004

No technical references available for this data set.
No FAQs or How Tos available for this data set.

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