L Band Brightness Temperature Observations over a Corn Canopy during the Entire Growth Cycle

doi:10.3390/s100706980

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Sensors 2010, 10(7), 6980-7001; doi:10.3390/s100706980

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L Band Brightness Temperature Observations over a Corn Canopy during the Entire Growth Cycle

Alicia T. Joseph^1,* , Rogier Van der Velde², Peggy E. O’Neill¹, Bhaskar J. Choudhury¹, Roger H. Lang³, Edward J. Kim¹ and Timothy Gish⁴

¹ Hydrological Sciences Branch/614.3, Hydrospheric and Biospheric Sciences Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA ² International Institute for Geo-Information Science and Earth Observation (ITC), Hengelsostraat 99, P.O. Box 6, 7500 AA Enschede, The Netherlands ³ Department of Electrical Engineering & Computer Sciences, the George Washington University, Washington, DC 20052, USA ⁴ USDA-ARS Hydrology and Remote Sensing Laboratory, Building 007, BARC-WEST, Beltsville, MD 20705, USA

* Author to whom correspondence should be addressed.

Received: 26 March 2010; in revised form: 11 June 2010 / Accepted: 11 June 2010 / Published: 20 July 2010

(This article belongs to the Section Remote Sensors)

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Abstract: During a field campaign covering the 2002 corn growing season, a dual polarized tower mounted L-band (1.4 GHz) radiometer (LRAD) provided brightness temperature (T_B) measurements at preset intervals, incidence and azimuth angles. These radiometer measurements were supported by an extensive characterization of land surface variables including soil moisture, soil temperature, vegetation biomass, and surface roughness. In the period May 22 to August 30, ten days of radiometer and ground measurements are available for a corn canopy with a vegetation water content (W) range of 0.0 to 4.3 kg m⁻². Using this data set, the effects of corn vegetation on surface emissions are investigated by means of a semi-empirical radiative transfer model. Additionally, the impact of roughness on the surface emission is quantified using T_B measurements over bare soil conditions. Subsequently, the estimated roughness parameters, ground measurements and horizontally OPEN ACCESS (H)-polarized T_B are employed to invert the H-polarized transmissivity (γh) for the monitored corn growing season.

Keywords: field campaign; L-band radiometry; vegetation effects; surface roughness

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Cite This Article

MDPI and ACS Style

Joseph, A.T.; Van der Velde, R.; O’Neill, P.E.; Choudhury, B.J.; Lang, R.H.; Kim, E.J.; Gish, T. L Band Brightness Temperature Observations over a Corn Canopy during the Entire Growth Cycle. Sensors 2010, 10, 6980-7001.

AMA Style

Joseph A.T., Van der Velde R., O’Neill P.E., Choudhury B.J., Lang R.H., Kim E.J., Gish T. L Band Brightness Temperature Observations over a Corn Canopy during the Entire Growth Cycle. Sensors. 2010; 10(7):6980-7001.

Chicago/Turabian Style

Joseph, Alicia T.; Van der Velde, Rogier; O’Neill, Peggy E.; Choudhury, Bhaskar J.; Lang, Roger H.; Kim, Edward J.; Gish, Timothy. 2010. "L Band Brightness Temperature Observations over a Corn Canopy during the Entire Growth Cycle." Sensors 10, no. 7: 6980-7001.

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