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   "description": "This is a mosaic of the file, \"Impervious_Change_2007\", with approximately 40 individual town impervious raster files that were not included in that first file, plus selected extracts from \"IMPERV\" (2004) to fill in data gaps in the Fryeburg area, the Sanford area, the Appleton area, and some unorganized townships. The individual town raster sets (\"maine_t2_impervious_[TOWN]\" ) originated from \\\\Brm-fgb1pcnmun2\\DevelopmentMapping\\Final ). Metadata for those rasters and Impervious Change 2007 is as follows:SummaryThis is a representation of the impervious surfaces meeting specific criteria within the state of Maine, derived from imagery circa 2007, depending on the location within the state. It was created as part of a project designed to quantify change in development between T1 (early date, circa 2001 - 2003) and T2 (late date, this dataset).DescriptionThis project resulted in the creation of raster data layers that document changes in the spatial pattern of commercial and residential development between two time periods in organized towns in Maine. This analysis was based primarily off leaf-off imagery from 2001-04 (T1) and leaf-on imagery collected in 2007 (T2) through the NAIP program (National Agriculture Imagery Program). Sanborn produced a yes/no \u201cbaseline\u201d development raster from the 2001-04 imagery (T1), a yes/no \u201ccurrent\u201d development raster from the 2007 imagery (T2), and a yes/no \u201cnew development between T1 and T2\u201d raster. Sanborn classified the imagery for the 2001-04 baseline raster, the 2007 current raster, and the 2004-07 change in development raster and carried out a statistically valid accuracy assessment for the 2001-04 raster and the change analysis.CreditsState of Maine, Sanborn Map Company",
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