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The effect of finite field size on classification and atmospheric correctionThe atmospheric effect on the upward radiance of sunlight scattered from the Earth-atmosphere system is strongly influenced by the contrasts between fields and their sizes. For a given atmospheric turbidity, the atmospheric effect on classification of surface features is much stronger for nonuniform surfaces than for uniform surfaces. Therefore, the classification accuracy of agricultural fields and urban areas is dependent not only on the optical characteristics of the atmosphere, but also on the size of the surface do not account for the nonuniformity of the surface have only a slight effect on the classification accuracy; in other cases the classification accuracy descreases. The radiances above finite fields were computed to simulate radiances measured by a satellite. A simulation case including 11 agricultural fields and four natural fields (water, soil, savanah, and forest) was used to test the effect of the size of the background reflectance and the optical thickness of the atmosphere on classification accuracy. It is concluded that new atmospheric correction methods, which take into account the finite size of the fields, have to be developed to improve significantly the classification accuracy.
Document ID
19820011771
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Kaufman, Y. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fraser, R. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 4, 2013
Publication Date
September 1, 1981
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-TM-83818
Accession Number
82N19645
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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