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The aerial cone penetrometer is a simple device for the determination of soil trafficability for a remote source. It has a number of possible military applications and would require only a modest amount of additional development to make it a practical Army tool. The credibility of the aerial cone penetrometer is best exemplified by the smooth and reproducible relations that exist between soil strength (as measured in terms of cone index) and depth of penetration of the aerial penetrometer (at a constant contact velocity).
A survey of the state-of-the-art in the evaluation of natural terrain by earth-science techniques and measurement systems is presented in response to a need that existed for many years. This report considers the terrain as an envelope of the environment and all related parameters that are basic in an evaluation for relevant military applications such as unimproved landing areas, trafficability, site selection for operational facilities, terrain reconnaissance and surveillance, and target detection within a masked terrain complex. Methods of terrain-data acquisition, analysis, and evaluation and their limitations are reviewed. The status of research and development, specifying the gaps in technology, is summarized with accompanying conclusions. The report forecasts the requirement for an automated terrain-data acquisition, storage, and display system. Information pertaining to the classification of terrain data, field devices to measure bearing strength, and a visualized optimum remote sensing system is also given in the appendix. A glossary and a comprehensive bibliography are included. (Author).
Report on the research by U.S. Air Force personnel and geologists who tested a 5000-foot emergency airstrip on a clay flat near Brønlunds Fjord, northern Greenland in August, 1957. This test, called "Operation Groundhog" emphasized the importance of ice-free terrain in Northern Greenland. Includes information on terrain, construction, water supply, tables, photographs, maps and references