SMEX02 Passive and Active L and S band System (PALS) Data
Entry ID: NSIDC-0183

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Summary
Abstract: This data set contains calibrated sensor measurements acquired by the Passive and Active L- and S-band (PALS) airborne microwave sensor during the Soil Moisture Experiment 2002 (SMEX02). This data set includes radiometer brightness temperatures (TB) at 1.41 and 2.69 GHz, and radar backscatter coefficients at 1.26 and 3.15 GHz, with multiple polarizations and a 45° incidence angle. The data are geolocated with latitude and longitude information for each data sample. Included are coregistered nadir and boresight infrared temperatures, altitude, and attitude information. Radar and radiometric studies are relevant to SMEX02 because the data indicates wet soil versus dry soil based on differences in emissivity in the microwave spectral region. Data are provided as ASCII files for each flight line and day of the mission. Ten flight lines were flown each day. Flights took place on June 25, 27, and July 1, 2, 5, 6, 7, 8 2002. Data are available via FTP. These data were collected as part of a validation study for the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E). AMSR-E is a mission instrument launched aboard NASA's Aqua Satellite on 04 May 2002. AMSR-E validation studies linked to SMEX are designed to evaluate the accuracy of AMSR-E soil moisture data. Specific validation objectives include assessing and refining soil moisture algorithm performance; verifying soil moisture estimation accuracy; investigating the effects of vegetation, surface temperature, topography, and soil texture on soil moisture accuracy; and determining the regions that are useful for AMSR-E soil moisture measurements.
Geographic Coverage
 N: 41.9952 S: 41.9213  E: -93.4013  W: -93.775

Data Set Citation
Dataset Originator/Creator: Eni Njoku
Dataset Title: SMEX02 Passive and Active L and S band System (PALS) Data
Dataset Release Date: 2003-09-30
Dataset Release Place: Boulder, CO
Dataset Publisher: National Snow and Ice Data Center (NSIDC)
Online Resource: http://nsidc.org./data/nsidc-0183.html


Temporal Coverage
Start Date: 2002-06-25
Stop Date: 2002-07-08


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA


Science Keywords
SPECTRAL/ENGINEERING >MICROWAVE >BRIGHTNESS TEMPERATURE    [Definition]
SPECTRAL/ENGINEERING >RADAR >RADAR BACKSCATTER    [Definition]


ISO Topic Category
IMAGERY/BASE MAPS/EARTH COVER


Platform
AIRCRAFT    [Information]


Instrument
RADAR >Radio Detection and Ranging    [Information]
INFRARED RADIOMETERS    [Information]
RADIOMETERS    [Information]


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ISMEX >Iowa Soil Moisture Experiment    [Information]
ESIP >Earth Science Information Partners Program    [Information]
SMEX02 >Soil Moisture Experiments in 2002    [Information]


Keywords
Airborne Radar Sounding
Brightness Temperature
L- band radar
NSIDC
NSIDC > National Snow and Ice Data Center
Passive Microwave Brightness Temperatures
Radar
SMEX


Data Set Progress
COMPLETE


Originating Center
NSIDC


Data Center
NSIDC Distributed Active Archive Center    [Information]
Data Center URL: http://nsidc.org/daac/index.html
Dataset ID: NSIDC-0183

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org
Dataset ID: NSIDC-0183

Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA



Distribution
Distribution_Media: FTP
Distribution_Format: ASCII text files


Personnel
ENI G. NJOKU
Role: INVESTIGATOR
Phone: 818-354-3693
Email: njoku at lor.jpl.nasa.gov
Contact Address:
M/S 300-233
Jet Propulsion Laboratory
California Institute of Technology
4800 Oak Grove Drive
City: Pasadena
Province or State: CA
Postal Code: 91109-8099
Country: USA


WILLIAM J. WILSON
Role: INVESTIGATOR
Contact Address:
Jet Propulsion Laboratory
M/S 300-233
4800 Oak Grove Drive
City: Pasadena
Province or State: CA
Postal Code: 91109-8099
Country: USA


SIMON H YUEH
Role: INVESTIGATOR
Contact Address:
Jet Propulsion Laboratory
M/S 300-233
4800 Oak Grove Drive
City: Pasadena
Province or State: CA
Postal Code: 91109-8099
Country: USA


STEVEN J DINARDO
Role: INVESTIGATOR
Contact Address:
Jet Propulsion Laboratory
M/S 300-233
4800 Oak Grove Drive
City: Pasadena
Province or State: CA
Postal Code: 91109-8099
Country: USA


NSIDC USER SERVICES
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Publications/References
Wilson, W.J., S. H. Yueh, S. J. Dinardo, S. Chazanoff, F. K. Li, and Y. Rahmat-Samii (2001): Passive Active L- and S-band (PALS) Microwave Sensor for Ocean Salinity and Soil Moisture Measurements, IEEE Trans. Geoscience Remote Sensing 39, 1039-1048.

Creation and Review Dates
DIF Creation Date: 2003-09-19
Last DIF Revision Date: 2012-05-14

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