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<br />. <br /> <br />. <br /> <br />. <br /> <br />"! ~ <br /> <br />Deliverables to State: <br />A task memorandum describing the accuracy assessment process used. <br />Files: Accuracy Assessment Report - Final accuracy assessment tables will be <br />created from ERDAS Imagine and delivered as .txt or MS Excel .xls files. <br /> <br />Task 18. Post Processing <br /> <br />Smoothing <br /> <br />After the classification meets or exceeds the specified accuracy standards, the data should be <br />generalized to remove "salt and pepper." This process involves dropping out pixel clumps <br />under a certain size threshold and filling those areas in with a surrounding category. Small <br />pixel clumps corresponding to edge effects from the original data are often incorrectly <br />classified, and should be eliminated (Booth and Oldfield, 1989). Elimination of small pixel <br />clumps also greatly reduces the number of polygons produced when the raster data are <br />converted to ARC/INFO format. The contractor will set the minimum mapping unit to 1 acre or <br />greater and perform clump and sieve operations on the data. <br /> <br />Edge-matching <br /> <br />The contractor will perform edge matching along scene boundaries so that field boundary <br />shapes are maintained and the crop type and irrigation status is consistent. <br /> <br />Mosaicing and Quadrangle Tiling <br /> <br />Before clipping the classification to the USGS quad boundaries, all of the classified images for <br />a division should be stitched together to form one large image. The classification can then be <br />tiled into the map sheet units. <br /> <br />Deliverables to State: <br />A task memorandum describing process. <br /> <br />Images: <br />Final Classification (Two files) - This will include the final classification for <br />Irrigation Status and Crop Type from the Landsat data. The data will have been <br />classified, edited for the minimum mapping unit and edge matched where <br />necessary in .img format for each division. The Arclnfo Dolvqon coverage with <br />the acres, irr_status, and crop_type information for 2000. <br /> <br />Page 22 <br />