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CRDSS <br />TASK MEMORANDUM 1.06-3 <br />Spatial Database <br />Spatial Database Population <br />1.0 ISSUE <br />This task memorandum describes the population of the spatial database. This document summarizes <br />spatial data populated in response to the modeling tasks with an emphasis on the Gunnison River basin. <br />Where possible, data have been subjected to quality checks and methods for determining reliability. <br />2.0 DISCUSSION/ANALYSIS <br />The spatial database consists of geo-referenced data stored and manipulated in such a way that the user <br />can display graphical representations of data. In some cases the user will be able to select sites, lines, <br />cells, or polygons and query data stored in INFORMIX. All of the coverages are for the entire Western <br />Slope and are available through the visual data browser (VDB) interface, ARC/INFO, and GRASS, <br />unless otherwise indicated. The sources and schedule for population of spatial data are presented in <br />Tables 1 and 2. <br />Topography/ Elevation <br />Elevation data consist of a digital elevation model (DEM) for the Western Slope of Colorado. Elevation <br />correction is needed for the agricultural consumptive use methods. Population for the Gunnison River <br />basin is complete. Final DEM data were imported from the U.S. Geological Survey (USGS) at 3 arc <br />seconds resolution and a vector coverage with contour lines every 100 meters and a raster coverage with <br />1:100,000 resolution. <br />General Hydrography <br />Surface water features are described by this coverage. Surface water features are used for the water rights <br />planning model for building surface water networks. General hydrography consists of a stream network <br />at 1:500,000 resolution for the entire State obtained from the Colorado Department of Local Affairs <br />(DOLA). Gunnison River basin was edited and merged from U.S. Bureau of Reclamation (USBR) <br />archives of basic hydrography in 1:24,000 resolution. <br />Hydrologic Units <br />This coverage contains hydrologic unit boundaries. Hydrologic units are vector-based boundary lines <br />and raster area maps for drainage areas used by the USBR. These data are used to determine drainage <br />areas for the water rights and consumptive use models and are also used for data analysis. Resolution is <br />1:250,000 or smaller. The attributes follow hydrologic unit codes defined by the hydrologic unit map <br />series initiated in the fall of 1972 by the Geological Survey's Office of Water Data Coordination. These <br />data were obtained over the Internet from the USGS Mosaic site listed in the on-line documentation. <br />1 <br />A275 01.08.95 1.06-3 Lange <br />