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RTM (~90 m) data and Radarsat-1 images of northern Sudan were processed for exploring potential groundwater accumulation sites in the region. Data analysis unveiled three extensive ancient river courses named as Howar, El-Qaab and Arbain. These eastward flowing rivers, which are now partly hidden beneath the sand, are extinct tributaries of the Nile Valley hydro-system. The main channels of these...
This paper examines the calibration performance of the RADARSAT-1 products since spacecraft commissioning in 1996, and briefly reassesses the calibration ground systems and methodologies in the light of the mission's twelve-year calibration experience and data record. Choices made in the design, deployment and implementation of the RADARSAT-1 calibration plan are retrospectively explored in the context...
Environment Canada's Canadian Ice Service (CIS) is responsible for the daily monitoring of Canadian coastal waters for ice and icebergs, and the presence of oil-based pollution. The routine provision of information on floating ice conditions promotes safe and efficient maritime operations and protects Canada's environment by providing reliable and timely information to marine users in Canadian waters...
This paper presents an overview of various detection and estimation algorithms that have been implemented in the RADARSAT-2 MODEX Processor as well as experimental plans for the validation and demonstration of the space-based GMTI mode. Preliminary RADARSAT-2 GMTI results are also presented.
ALOS/PALSAR has been on the orbit since January 24 2006. After the initial calibration phase, the PALSAR has been being used as the calibrated instrument for the land monitoring. Using the calibration target data of the corner reflectors and the distributed target, it has been confirmed that the PALSAR is well stabilized and calibrated. One of the two major themes that the PALSAR can contribute to,...
Polarimetric PALSAR system parameters are assessed using data sets collected over various calibration sites. The data collected over the Amazonian forest permits validating the zero Faraday rotation hypotheses near the equator. The analysis of the Amazonian forest data and the response of the corner reflectors deployed during the PALSAR acquisitions lead to the conclusion that the antenna is highly...
Polarization dependence of L-band measurements over the ocean on surface wind is investigated for the incidence angle ranging from 23 to 25 degrees, by using the Phased-Array L-band Synthetic Aperture Radar (PALSAR) onboard the Advanced Land Observing Satellite (ALOS) and MetOp/ASCAT wind vectors. Polarization ratio (VV/HH) shows clear incidence angle and wind speed dependencies. It increases with...
This paper describes a microwave model which simulates the emissivity of forests, including litter effects. Detailed input data about forest geometry are obtained by direct measurements and/or by allometric equations. Model outputs have been compared with multifrequency measurements carried out over five broadleaf forests in Italy. Fundamental information about forest properties was available. A general...
Truck-based measurements of brightness temperature at L- band over small deciduous stands located in Maryland were made in 2006 and 2007. Ground truth data related to forest stands and the ground were also collected. The deciduous trees were modeled by the Distorted Born Approximation (DBA) in conjunction with Peak's principle. The ground was modeled as a half space with surface roughness. The model...
During 2007 a field experiment was conducted with a goal of optimizing microwave soil moisture retrieval algorithms for small to medium deciduous trees. After initial field checkout in Fall 2006, the ComRAD microwave truck instrument system was deployed to a test site with several stands of deciduous paulownia trees. A joint effort of NASA/GSFC and George Washington University, ComRAD consists of...
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