NDLI: Modeling the backscattering and transmission properties of vegetation canopies

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Modeling the backscattering and transmission properties of vegetation canopies

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ulaby, F. T. Allen, C. T.
Copyright Year	1984
Description	Experimental measurements of canopy attenuation at 10.2 GHz (X-band) for canopies of wheat and soybeans, experimental observations of the effect upon the microwave backscattering coefficient (sigma) of free water in a vegetation canopy, and experimental measurements of sigma (10.2 GHz, 50 deg, VV and VH polarization) of 30 agricultural fields over the growing season of each crop are discussed. The measurements of the canopy attenuation through wheat independently determined the attenuation resulting from the wheat heads and that from the stalks. An experiment conducted to simulate the effects of rain or dew on sigma showed that sigma increases by about 3 dB as a result of spraying a vegetation canopy with water. The temporal observations of sigma for the 30 agricultural fields (10 each of wheat, corn, and soybeans) indicated fields of the same crop type exhibits similar temporal patterns. Models previously reported were tested using these multitemporal sigma data, and a new model for each crop type was developed and tested. The new models proved to be superior to the previous ones.
File Size	22925167
Page Count	359
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850019009
Archival Resource Key	ark:/13960/t6159f39z
Language	English
Publisher Date	1984-02-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Microwave Scattering Water Soybeans Earth Resources Program Canopies Vegetation Backscattering Microwave Attenuation Corn Radar Scattering Kansas Wheat Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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