ComRAD active / passive microwave measurement of tree canopies

The NASA/GSFC and George Washington University network analyzer-based multifrequency truck- mounted radar system has recently been upgraded with the addition of a dual-polarized 1.4 GHz total power radiometer. The system, now called ComRAD for Combined Radar/Radiometer, can function as a ground-based instrument simulator for L band space missions such as Hydros, Aquarius, and SMOS. In late summer 2006 ComRAD was deployed to the field to begin a series of coordinated active/passive L band measurements over small stands of deciduous and coniferous trees in order to improve our understanding of the microwave properties of trees and their effect on soil moisture retrieval algorithms. This paper describes the preliminary measurements obtained at the start of a three-year planned field measurement effort.

[1]  T. Jackson,et al.  Use of active and passive microwave remote sensing for soil moisture estimation through corn , 1996 .

[2]  T. J. Schmugge,et al.  Vegetation Effects on the of Soils Microwave Emission , 1991 .

[3]  Jan Vanderborght,et al.  Measured microwave radiative transfer properties of a deciduous forest canopy , 2007 .

[4]  R.H. Lang,et al.  Role of albedo in sensing soil moisture under vegetation with passive L-band algorithms , 2004, IGARSS 2004. 2004 IEEE International Geoscience and Remote Sensing Symposium.

[5]  T. Schmugge,et al.  Passive microwave sensing of soil moisture under vegetation canopies , 1982 .

[6]  P. O’neill,et al.  Multi-Sensor Microwave Soil Moisture Remote Sensing: NASA's Combined Radar/Radiometer (ComRAD) System , 2006, 2006 IEEE MicroRad.

[7]  Jean-Pierre Wigneron,et al.  Simulating L-band emission of forests in view of future satellite applications , 2002, IEEE Trans. Geosci. Remote. Sens..

[8]  J. Wigneron,et al.  A field experiment on microwave forest radiometry: L-band signal behaviour for varying conditions of surface wetness , 2007 .

[9]  Ross Nelson,et al.  A Portable Airborne Laser System for Forest Inventory , 2003 .

[10]  Paolo Pampaloni,et al.  Microwave radiometry of forests , 2004 .

[11]  T. Schmugge,et al.  Vegetation effects on the microwave emission of soils , 1991 .

[12]  R. Lang,et al.  Scattering from a layer of discrete random medium over a random interface: application to microwave backscattering from forests , 2004 .