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Evaluation of the effects of the seasonal variation of solar elevation angle and azimuth on the processes of digital filtering and thematic classification of relief unitsThe effects of the seasonal variation of illumination over digital processing of LANDSAT images are evaluated. Two sets of LANDSAT data referring to the orbit 150 and row 28 were selected with illumination parameters varying from 43 deg to 64 deg for azimuth and from 30 deg to 36 deg for solar elevation respectively. IMAGE-100 system permitted the digital processing of LANDSAT data. Original images were transformed by means of digital filtering so as to enhance their spatial features. The resulting images were used to obtain an unsupervised classification of relief units. Topographic variables (declivity, altitude, relief range and slope length) were used to identify the true relief units existing on the ground. The LANDSAT over pass data show that digital processing is highly affected by illumination geometry, and there is no correspondence between relief units as defined by spectral features and those resulting from topographic features.
Document ID
19840015912
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Parada, N. D. J.
(Instituto de Pesquisas Espaciais Sao Jose dos Campos, Brazil)
Novo, E. M. L. M.
(Instituto de Pesquisas Espaciais Sao Jose dos Campos, Brazil)
Date Acquired
September 4, 2013
Publication Date
August 1, 1983
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-CR-172796
NAS 1.26:172796
E84-10121
INPE-2858-RPE/440
Accession Number
84N23980
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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