Atlas of selected crop spectra, Imperial Valley, California
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Ungar, S. G.↗
Engineering topics
Egbert, D.
Publications and source records attributed to Egbert, D..
Thematic mapper studies: Data quality analysis
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Ungar, S. G.↗
Stream pattern analysis using optical processing of ERTS imagery of Kansas
A spatial frequency analysis was carried out to obtain large-scale geologic and other ground pattern spatial frequency and orientational data from an optical data processing system using Earth Resources Technology Satellite-1 (ERTS-1) imagery of Kansas as input. The Diffraction Pattern Sampling Unit (DPSU) of the optical data processing system consists of a photodiode array containing 32 wedge-shaped photodiodes and 32 annular ring diodes. The curve obtained from the intensity distribution of the frequency spectrum yielded by the ring diodes gives the spatial frequency contributions due to ground features on the image. The curve obtained from the wedge-shaped diodes indicates the orientation of features in the sample area. Ten sample sites were used for each of eight geologic-physiographic regions. Comparison of ERTS-1 images with their respective spatial frequency and orientational curves reveals that preferred orientations of drainage produce recognizable peaks.
Mccauley, J.↗
Optical data processing analysis of stream patterns exhibited on ERTS-1 imagery
The purpose of the investigation described in this paper has been the analysis of large-scale geologic ground patterns in Kansas using ERTS-1 imagery and optical data processing techniques. Optical spatial frequency data provide a repeatable quantitative means of specifying ground pattern characteristics.
Egbert, D.↗