NOTICE -- The LBA-ECO Project website is no longer being supported.  This archive is a snapshot, as it existed in 2013, of the LBA-ECO website, maintained by NASA Goddard Space Flight Center, and now archived at the ORNL DAAC.  Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC.
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Investigation:

LC-15 (Saatchi / Alvala)

LBA Dataset ID:

LC15_QSCAT_1km

Originator(s):

Saatchi, Dr. Sassan S.

Point(s) of Contact:

Saatchi, Dr. Sassan S. (Saatchi@congo.jpl.nasa.gov)

Dataset Abstract:

The scatterometer measurements are acquired from QSCAT and The Scatterometer Climate Record Pathfinder Project.
QSCAT data distributed for the LBA Science are monthly mean data at 1 km spatial resolution derived from the enhanced spatial resolution data produced by BYU processor (http://www.scp.byu.edu/docs/QSCAT_user_notes.html). The original data can be acquired from the BYU website (http://www.scp.byu.edu) at 3-4 day temporal resolution and 2.25 km spactial resolution. The wide swath and frequent overflights permit generation of a wide variety of SeaWinds Image products. For highest possible spatial resolution, multiple orbit passes are combined. These are the 'all pass' images. Since generally orbit passes of a given point on the Earth occur at nearly the same time of day, time-of-day studies are facilitated by computing images from ascending (morning) passes only, and descending (evening) passes only. Enhanced resolution images made from QuikSCAT data use two different forms of single-variate the Scatterometer Image Reconstruction (SIR) algorithm: for egg sigma-0 measurements the SIR algorithm is used while for slice sigma-0 measurements, the SIR with filtering (SIRF) algorithm is used. For egg measurements the full antenna/processing spatial response is used while a simplified spatial response function in which the spatial response is assumed to be 1 over the footprint and 0 elsewhere is used for slice measurements. Unlike other instruments, QuikSCAT observations are at (essentially) a single incidence angle for each beam so no incidence angle dependence (B) estimates are made. The SIR algorithm with eggs makes images of A (in this case, sigma-0 at the measurement incidence angle) on an 4.5 km pixel grid. The effective resolution varies depending on region and sampling conditions but is estimated to be 8-10 km in most areas. The SIRF algorithm with slices makes A images at 2.225 km pixel spacing with an estimated effective resolution of 6-8 km. Slice measurements are much noisier than egg measurements. Multiple passes of the spacecraft are combined to produce a higher spatial resolution (at a cost of reduced temporal resolution).
QuikSCAT is a dual-pencil-beam conicly scanning scatterometer with the outer beam V pol and the inner beam H pol. The operation frequency is 13.4 GHz. In combining the multiple passes, sigma-0 is assumed to be independent of azimuth angle. While true for most areas, some azimuth dependence in sigma-0 has been observed in Antarctic firn, presumably due to sastrugi or snow dunes.

Beginning Date:

2000-01-01

Ending Date:

2000-12-30

Metadata Last Updated on:

2013-07-30

Data Status:

Archived at LBA-DIS Only

Access Constraints:

Public

Data Center URL:

http://www-radar.jpl.nasa.gov/carbon/

Distribution Contact(s):

Dr. Sassan Saatchi saatchi@congo.jpl.nasa.gov

Access Instructions:

Public

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

Access data via ORNL DAAC:  Search at ORNL DAAC
Access data via PI web site: ftp://www-radar.jpl.nasa.gov/projects/carbon/ab/QSCAT:  ftp://www-radar.jpl.nasa.gov/projects/carbon/ab/QSCAT

Documentation/Other Supporting Documents:

http://www-radar.jpl.nasa.gov/carbon/ab/qs.htm:  http://www-radar.jpl.nasa.gov/carbon/ab/qs.htm

Citation Information - Other Details:

Long D., M. Drinkwater, B. Holt, S. Saatchi, and C. Bertoia. 2008. LBA-ECO LC-15 1km Monthly Mean QSCAT Data over the Amazon Basin: 2000. Data set. Acquired from QSCAT and The Scatterometer Climate Record Pathfinder Project for the LBA Study Area. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.

Keywords - Theme:

Parameter Topic Term Source Sensor
RADAR BACKSCATTER RADIANCE OR IMAGERY RADAR STS-99 (SPACE TRANSPORT SYSTEM STS-99) QSCAT SCATTEROMETER

Uncontrolled Theme Keyword(s):  Backscatter , QSCAT, QuikSCAT, Surface Moisture

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Amazon Basin Amazon Basin 13.85830 -82.72083

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