Open-File Report 2009–1089
This report contains digital data, image files, and text files describing data formats and survey procedures for two high-resolution aeromagnetic surveys in south-central Colorado: one in the eastern San Luis Valley, Alamosa and Saguache Counties, and the other in the southern Upper Arkansas Valley, Chaffee County. In the San Luis Valley, the Great Sand Dunes survey covers a large part of Great Sand Dunes National Park and Preserve and extends south along the mountain front to the foot of Mount Blanca. In the Upper Arkansas Valley, the Poncha Springs survey covers the town of Poncha Springs and vicinity. The digital files include grids, images, and flight-line data.
Several derivative products from these data are also presented as grids and images, including two grids of reduced-to-pole aeromagnetic data and data continued to a reference surface. Images are presented in various formats and are intended to be used as input to geographic information systems, standard graphics software, or map plotting packages.
First posted May 19, 2009
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Drenth, B.J., Grauch, V.J.S., Bankey, Viki, and New Sense Geophysics, Ltd., 2009, Digital data from the Great Sand Dunes and Poncha Springs aeromagnetic surveys, south-central Colorado: U.S. Geological Survey Open-File Report 2009–1089.