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~;J <br />Tak <br />C. Specific Task Descriptions <br />Task 89 -Mapping of Current Land Use and Irrigated Field Boundaries <br />Objective: <br />Mapping of irrigated parcels and their crop types and performing accuracy assessment of irrigated lands <br />and crop type mapping for Water Districts 4-9, 23, 47, 48, 76, and 80. Conduct peer review of ET <br />estimates from native vegetation. <br />Background: <br />Current land use, including irrigation and crop type, was finalized for Districts 64, 1, 2, and 3 under <br />Phase 1&2. Irrigation and crop type mapping and accuracy assessment for Districts 4-9, 23, 47, 48, 76, <br />and 80 will be completed in this Task. Other related subtasks include mapping of water bodies and peer <br />review of the native vegetation ET estimates. <br />Approach: <br />89.7 Review, Revision, and Final Classification. 'The Contractor will be responsible for review, <br />revision, and final classification of results for irrigation status and crop types. Instrumental in this <br />process will be input from water users, division engineers, conservancy district engineers,. and <br />technicians. These personnel will be provided with draft products for use in reviewing the field <br />boundaries, current land use and crop types. Interaction with these personnel for this review will be <br />conducted at the same time as the consultation on :irrigation service areas, as described in Task 91, <br />for Districts 4-9, 23, 47, 48, 76, and 80. Based on this review, the Contractor will edit the draft field <br />boundaries and classifications and prepare the final products for Districts 4-9, 23, 47, 48, 76, and 80. <br />89.8 Conduct Accuracy Assessment. The Contractor will assess the accuracy of the classification of <br />irrigation status and crop type for Districts 4-9, 23, 47, 48, 76, and 80. The primary source of data <br />will be the Farm Service Area field-checked data for• the year 2001. <br />89.9 Peer Review ET Estimates from Remote Sensing. Remote sensing has the potential for <br />estimating ET on a regional scale with a minimal amount of collected ground data. Through remote <br />sensing, it is possible to estimate an instantaneous ET on a pixel basis (e.g., 30-meter pixels for <br />Landsat TM) using the surface energy balance equatiom or by relating reference ET to satellite image <br />parameters. The Consumptive Use (CU) Contractor will make estimates of ET from native vegetation <br />using relationships established from ground measurements of ET and parameters derived from <br />2 <br />compression software -have proven to be critical and also will be used under Phase 3. Other special <br />software is not anticipated for Phase 3, but if the need arises will be brought to the attention of the <br />State. <br />