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~~ <br />consumptive use for modeling applications; and (iv) Raster files of original MODIS imagery and <br />intermediate products such as NDVI. <br />Task 91. Develop a Ditch and Canal Data Layer <br />Objective.• Develop a canal and irrigation ditch data layer and assign diversion structure IDs. <br />Background: SPDSS contractors and users need a complete data layer with active canals and irrigation <br />ditches and their associated diversion structure IDs. <br />Approach: <br />91.9 Develop ditches and canals data layer and attribute these with the correct diversion structure <br />ID. The contractor has compiled a ditch and canal data layer from USGS 24k DRGs and other existing <br />sources during previous phases. Following interviews with water users and water commissioners together <br />with analysis of the Ortho Image Base Map, additional ditches and canals have been added to this dataset. <br />While the contractor has been able to considerably augment and enhance the original dataset by digitizing <br />and attributing additional canals and ditch data, some small diversions are impossible to map using <br />available data - i.e. a few of the narrowest ditches are not visible on the Ortho Image Base Map. It is <br />believed that all of the ditches and canals that are visible have been mapped. Thus, nearly every diversion <br />structure mapped with 2001 irrigation will have an associated ditch. A conservative estimate of the <br />omission error is believed to be <5%, and it is most likely that in reality 2% or less of the diversions will <br />not have an associated ditch. During interviews conducted in Phases 1, 2, and 3 it was discovered that <br />some diversion structures share a ditch with another structure within a portion of their service area. For <br />these diversion structures two ditch lines will be created, and will be spatially identical for the portion of <br />ditch that they share. <br />The 2001 irrigation service areas developed in Phases 1, 2, and 3, and diversion structures from <br />HydroBase, will be used to finalize the ditch and canal data layer. All canals and any laterals from the <br />contractor's data layer that are within each active service area will be associated with that service area and <br />diversion structure. Ditches and canals that travel through a service area but do not receive water from <br />that service area will not be associated with that service area. Some service areas have several laterals <br />mapped, while other service areas do not. The contractor will not attempt to map any additional laterals <br />under this task. The canals and irrigation ditch layer will be completed with attributes for ditch name, <br />district, diversion structure ID, and diversion structure name. <br />Deliverables: <br />91.9 A final GIS shapefile containing active irrigation ditches and canals associated with key diversion <br />structures in the South Platte Basin. The shapefile will contain complete metadata describing the creation <br />and source of the dataset. The shapefile will be consistent with CDSS standards. <br />Task 98. Mapping, Visualization, and Presentation Tools <br />Objective: Visualize data and results produced under the SPDSS in a way that can be understood by <br />SPDSS users and the broader public. Create a variety of visualization products that State personnel can <br />use at different SPDSS user meetings as well as displays for the public. Develop tools to facilitate further <br />visualization of data by State personnel and others. Data and visualization products will be presented in a <br />neutral manner so that the audience may form their own conclusions about conditions in the basin. <br />Background.• This activity addresses one of the primary objectives of the SPDSS - to format data and <br />results effectively so that they are accessible to, and understandable by, SPDSS users (2.2 Feasibility <br />Study, page 2-3). In Phase 3, ArcReader applications, posters, fly-through videos and PowerPoint slides <br />were created to support SPDSS outreach efforts. ArcGIS Explorer will be developed as a tool the State <br />can use to further visualize and analyze SPDSS data (to be released by ESRI in mid-2006). Some <br />additional posters, fly-through videos and PowerPoint materials will be produced in Phase 4, to <br />