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SPDSS Memorandum -Final <br />To: Ray Alvarado, Ray Bennett <br />From: Riverside Technology, inc., Nils Babel, Timothy Martin, Kelly Scott <br />Subject: SPDSS Spatial System Integration Component, Task 91-Map Wells, Irrigation Systems <br />and Irrigation Service Areas <br />Date: January 9, 2007 <br />1. Introduction <br />This memorandum summarizes the procedures for the 2001 irrigated parcel mapping prepared under Task <br />91 -Map Wells, Irrigation Systems, and Irrigation Service Areas. These activities are described in the <br />Scope of Work for SPDSS Phase 1, 2, and 3 Spatial System Integration Component. Per the Scope of <br />Work, the objective of Task 91 includes the following: <br />Map irrigation distribution systems served by diversion structures ... using (1) irrigated <br />parcels and GIS coverages and (2) input from water commissioners, water managers, <br />and water users.... Map wells with capacity of SO gpm and greater and assign to specific <br />irrigation service areas. <br />This memo describes the process for mapping the 2001 irrigated parcels and irrigation service areas in <br />Division 1 (not including the Republican Basin) Water District 47 in Division 6. Throughout this memo, <br />the term Division 1 will refer to the water districts within the South Platte Basin only. The data were <br />delivered on CD to the State on September 8, 2006. The overall approach used in the mapping process is <br />shown in Figure 1. <br />2. Approach <br />2.1 Irrigated Parcel Delineation <br />The process for delineating irrigated parcels was completed in Subtask 90.2- Determine Field Polygon <br />Boundaries. The following is a brief summary of the process. The irrigated parcels for the 2001 <br />irrigation season were created from interpretation of Landsat satellite imagery, an orthophoto image base <br />map, and irrigated parcel data from Northern Colorado Water Conservancy District (NCWCD) and <br />Colorado State University (CSU). The 2001 multi-date Landsat imagery were combined into a composite <br />Normalized Difference Vegetation Index (NDVI). The image base map was created from high resolution <br />Digital Orthophoto Quarter Quads (DOQQ). The NCWCD and CSU data are interpretations of irrigated <br />land in 1997 and 2000, respectively, and were used as a reference to highlight potential areas of irrigation. <br />The approach to mapping irrigated parcels involved five steps: printing hard copy maps of the Image Base <br />Map and NDVI composite, interpreting maps and drawing parcel boundaries, quality assurance and <br />quality control (QAQC) of the parcel boundary drawings, digitizing parcel boundaries, and QAQC of the <br />digitized parcel boundaries. Table 1 references the SPDSS technical memoranda that describe the above <br />processes. <br />Page 1 of 55 ~Riversfde FecAno[o`(!~Y fnc. <br />4'JaYer Resources Errgi~ecr:np an~i L~ar+suFlrnd <br />