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- W2058731937 abstract "Surface-generating software is being used to construct geologic contour maps of aquifers in the San Juan basin. The maps are being prepared for the US Geological Survey's San Juan Basin Regional Aquifer-System Analysis. Geologic tops picked from geophysical logs are selected primarily from a data base of approximately 24,000 oil and gas test wells, supplemented with data from water wells and outcrops. A program was developed to eliminate suspected inaccurate data points intersecting the geographic information system coverage of control points with a polygon coverage of a fine-mesh grid. Points are collected by grid cell, and a mean value is determined for tops and map-unit coordinates. Points whose tops deviate significantly from the mean are deleted if incorrect. Geologic tops and map-unit coordinates of remaining control points in the same grid cell are reaveraged to reduce (1) small discrepancies at specific points and (2) the number of points used. Formatted data are gridded by the surface-generating software, and a contour map is produced. If the map is satisfactory, the grid is smoothed to reduce abrupt meandering of contours. The map is redrawn using an option that produces a contour-output file containing map-unit coordinates and numerical-attribute values of contours. This filemore » is used to create a geographic information system coverage. When a satisfactory contour map is produced and converted to a line coverage, the geographic information system edits, annotates, and clips contours with another line coverage consisting of the basinward part of the outcrop.« less" @default.
- W2058731937 created "2016-06-24" @default.
- W2058731937 creator A5033065508 @default.
- W2058731937 date "1989-01-01" @default.
- W2058731937 modified "2023-09-27" @default.
- W2058731937 title "Analysis of Spatial Geologic Data Using Surface Modeling and Geographic Information System Software--Applications to Regional Geologic Mapping, San Juan Structural Basin, New Mexico, Colorado, Arizona, and Utah: ABSTRACT" @default.
- W2058731937 doi "https://doi.org/10.1306/44b4a645-170a-11d7-8645000102c1865d" @default.
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