This data set includes brightness temperature (Tb) and soil moisture data.
SMEX02 Aircraft Polarimetric Scanning Radiometer (PSR) Data, Version 1
This is the most recent version of these data.
|
Geographic Coverage |
- If you are not currently logged in to Earthdata, you will be prompted to do so.
- You may register for an Earthdata Login if you do not have an account.
Once you have logged in, you will be able to click and download files via a Web browser. There are also options for downloading via a command line or client. For more detailed instructions, please see Options Available for Bulk Downloading Data from HTTPS with Earthdata Login.
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].Detailed Data Description
Data are provided in ASCII text format.
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.
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.
File sizes range 267 KB to 4.31 MB.
Total volume of data files is 195.15 MB.
Southernmost Latitude: 41.694°N
Northernmost Latitude: 42.732°N
Westernmost Longitude: 93.841°W
Easternmost Longitude: 93.161°W
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.
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 |
Software and Tools
Data Acquisition and Processing
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.
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