Earth Resources
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Published: 1983
Total Pages: 758
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Published: 1984
Total Pages: 1278
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Published: 1982
Total Pages: 564
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Published: 1987-10
Total Pages: 1238
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Published: 1980
Total Pages: 132
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DOWNLOAD EBOOKA selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International Aerospace Abstracts (IAA).
Author: James Richard Anderson
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Published: 1976
Total Pages: 36
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Published: 1986
Total Pages: 642
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Published: 1983
Total Pages: 638
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DOWNLOAD EBOOKAuthor: Lucy Anne Salazar
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Published: 1982
Total Pages: 28
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DOWNLOAD EBOOKRemote sensing techniques were investigated as an alternative for documenting selected preattack fire planning information. Locations of fuel models, road systems, and water i sources were recorded by Landsat satellite imagery and aerial photography for a portion of the Six Rivers National Forest in northwestern California. The two fuel model groups used were from the 1978 National Fire Danger Rating System and the Northern Forest Fire Laboratory. Landsat-derived fuel model data were digitized and computer analyzed by unsupervised and guided clustering techniques to produce a fuel model map of the area. Overall Landsat classification accuracies of fuel models were moderate-71 percent. This was mainly due to the incompatibilities found between fuel model descriptions and remote sensing capabilities. The results suggest, however, that a basic preattack plan that is moderately reliable, quickly attainable, and easily updated is feasible by applying remote sensing techniques.
Author: Philip M. McDonald
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Published: 1980
Total Pages: 796
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DOWNLOAD EBOOKIn a 1964-1967 study on the Challenge Experimental Forest, seedfall was evaluated in 2-, 5-, and 10-acre circular clearcuttings. During the 4 years, 10 seed crops, ranging from light to bumper, were produced by ponderosa pine. white fir, Douglas-fir, and incense cedar. Seedfall ranged from 76 to 40,691 sound seed per acre (188 to 100,547/ha) for a single species in a given year. From 89 to 100 percent of each species' seed fell within an area 1 1/2 times the height of the average dominant tree. Overall, seed distribution was highly variable.