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This data set includes brightness temperature (Tb) and soil moisture data.
Data Set ID:
NSIDC-0205
SMEX02 Aircraft Polarimetric Scanning Radiometer (PSR) Data, Version 1
This is the most recent version of these data.
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Geographic Coverage |
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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.
Bindlish, R. and T. Jackson. 2002. SMEX02 Aircraft Polarimetric Scanning Radiometer (PSR) Data, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/4N9BFV091ZXH. [Date Accessed].Collapse All / Open All
Detailed Data Description
Format
Data are provided in ASCII text format.
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File and Directory Structure
The main directories are regional and watershed, for the two different regions studied. Subdirectories under each of these are gridded and ungridded. The gridded directory contains brightness temperatures. Within the gridded directory is the sm directory, which contains the estimated soil moisture based on the PSR observations. The ungridded directory contains the raw brightness temperature observations.
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File Naming Convention
Gridded files have names such as "IA629.txt" and "WC629.txt." The two-letter prefix indicates the area (IA=regional, WC=Walnut Creek watershed), followed by the month and day.
Ungridded files use the same convention as above, with the addition of a letter A-D, which designates the number of times (1-4) the flight line was flown that day.
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File Size
File sizes range 267 KB to 4.31 MB.
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Volume
Total volume of data files is 195.15 MB.
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Spatial Coverage
Southernmost Latitude: 41.694°N
Northernmost Latitude: 42.732°N
Westernmost Longitude: 93.841°W
Easternmost Longitude: 93.161°W
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Temporal Coverage
This study was conducted 25 June through 12 July 2002.
Temporal Resolution
Flights took place on June 25, 27, 29 and July 1, 4, 8, 9, 10, 11, and 12 of 2002. All six flight lines were flown every day.
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Parameter or Variable
Parameter Description
The first two columns in the data columns are the UTM (northing and easting) and the next four columns are the brightness temperatures: C-band (7.32 GHz) (V and H) and X-Band (10.7 GHz) (V and H) observations, respectively. The files in the sm directory have the UTM location followed by the estimated soil moisture.
Sample Data Record
The following is a sample from the watershed gridded data table "WC627.txt."
| 435685.00 | 4648265.00 | 286.60 | 278.17 | 284.91 | 279.16 |
| 435685.00 | 4648065.00 | 288.28 | 279.96 | 287.29 | 281.20 |
| 435685.00 | 4647865.00 | 290.35 | 281.95 | 290.68 | 285.93 |
| 435685.00 | 4647665.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| 435685.00 | 4647465.00 | 291.95 | 283.68 | 293.42 | 288.32 |
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Software and Tools
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Data Acquisition and Processing
Sensor or Instrument Description
The PSR/CX instrument was integrated onto the NASA WFF P3B aircraft in the aft portion of the bomb bay. The PSR scans at a constant incidence angle of 45°. In SMEX02, PSR was flown over the watershed and regional areas. There were four regional flight lines at an altitude of ~8000 m. Two watershed lines at an altitude of ~1500 m covered the Walnut Creek watershed area. Flights took place on June 25, 27, 29 and July 1, 4, 8, 9, 10, 11, and 12 of 2002. All six flight lines were flown every day.
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References and Related Publications
Contacts and Acknowledgments
Thomas J. Jackson and Rajat Bindlish
ARS USDA Hydrology and Remote Sensing Lab
Albin J. Gasiewski, Marian Klein
NOAA ETL
Eni Njoku Jet Propulsion Laboratory
Document Information
DOCUMENT CREATION DATE
May 2004
No technical references available for this data set.
How To
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