NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Separability of agricultural crops with airborne scatterometryBackscattering measurements were acquired with airborne scatterometers over a site in Cass County, North Dakota on four days in the 1981 crop growing season. Data were acquired at three frequencies (L-, C- and Ku-bands), two polarizations (like and cross) and ten incidence angles (5 degrees to 50 degrees in 5 degree steps). Crop separability is studied in an hierarchical fashion. A two-class separability measure is defined, which compares within-class to between-class variability, to determine crop separability. The scatterometer channels with the best potential for crop separability are determined, based on this separability measure. Higher frequencies are more useful for discriminating small grains, while lower frequencies tend to separate non-small grains better. Some crops are more separable when row direction is taken into account. The effect of pixel purity is to increase the separability between all crops while not changing the order of useful scatterometer channels. Crude estimates of separability errors are calculated based on these analyses. These results are useful in selecting the parameters of active microwave systems in agricultural remote sensing.
Document ID
19830026125
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Mehta, N. C. (Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Date Acquired
September 4, 2013
Publication Date
June 1, 1983
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-CR-171673
LEMSCO-19422
E83-10403
NSC-18885
NAS 1.26:171673
SR-L3-04428
Accession Number
83N34396
Funding Number(s)
CONTRACT_GRANT: NAS9-15800
PROJECT: PROJ. AGRISTARS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available