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<br />v. Description of Data and Software: South Platte Geographic Infonnation System <br /> <br />Table 1: South Platte Mapping and Analysis Program Map Themes and Images <br /> <br />Theme Name Description <br />WD64 50m Color The 50 meter color imagery was created by utilizing a cubic convolution algorithm (utilizing the <br /> 16 nearest neighbors) on the original 82 feet Landsat imagery. The Landsat imagery that is <br /> used for SPMAP is one image that was obtained September 4, 1996. Bands 4,3, and 2 are <br /> displayed using the red, blue and green video guns resulting in a pseudo infrared color <br /> scheme. The imagery was processed by the Northern Colorado Water Conservancy District in <br /> 1996. <br />WD64 50m B & W The 50 meter grayscale was created by utilizing a cubic convolution algorithm (utilizing the 16 <br /> nearest neighbors) on the originalS meter IRS-1C imagery. The IRS-1C imagery that is used <br /> for SPMAP is a mosaic of three different images. The shape of the merged imagery is an <br /> upside down "L" in which the lower leg was obtained May 5, 1996; the center was obtained on <br /> Nov. 11, 1996; and the upper right leg was obtained on Nov. 25, 1996. The imagery was <br /> processed by the Northern Colorado Water Conservancy District in 1996. <br /> <br />1.2 Data Analysis Tools <br /> <br />Most of the data analysis tools developed to <br />support the creation of input files for the SPCU <br />Model are contained in the Crop Layer Edits <br />pull-down menu. For more information on the <br />use of these tools see the SPGIS User Manual or <br />the online help available in the interface. Below <br />is a short explanation of each of the tools. <br /> <br />1.2.1 Tools for Creatine: Croo Maps <br /> <br />These tools allow the user to convert an <br />existing crop type map to a format compatible <br />with the SPCU Model as well as tools for <br /> <br />creating or modifying crop type maps. These <br />tools include the ability to split and merge <br />polygons that represent field boundaries and to <br />assign crop types to the field polygons <br />(Figure 4). <br /> <br />Crop maps can be grouped into modeling units <br />containing individual fields with specific crop <br />types. The consumptive use of modeling units <br />can be computed as a farm in the SPCU Model. <br />Modeling units are scaleable so the model can <br />calculate the consumptive use of an entire basin <br />or for an individual farm or field. <br /> <br /> <br />1.2.2 Well Information <br /> <br />SPMAP can be used to assign wells to farms, <br />The following data can be entered: <br /> <br />1. Associated Wells - These are wells that are <br />currently associated with a farm. <br /> <br />Figure 4: Selecting Polygons to Merge <br /> <br />2. SDF Qotions - There are four values that can <br />be used for Stream Depletion Factors (SDF) <br />for the well selected: <br /> <br />User Defined - This is an arbitrary user defined value. <br /> <br />Completion Report: South Platte Mapping and Analysis Program <br /> <br />15 <br />