Color Ortho Imagery (2008 USGS) - 30cm
- In spring 2008, the U.S. Geological Survey, as part of its 133 Cities Urban Area mapping program, contracted for true-color imagery covering the metropolitan Boston area. Image type is 3-band (RGB) natural color (Red, Green, Blue) in 8 bits (values ranging 0-255) per band format. Pixel resolution is 0.3 meters (30 cm., ~one foot). The horizontal accuracy specification was 0.6m RMSE. MassGIS received imagery in the UTM Zone 19N coordinate system and projected the data into the Massachusetts State Plane Mainland NAD83 Meters coordinate system. This digital orthoimagery can serve a variety of purposes, from general planning, to field reference for spatial analysis, to a tool for development and revision of vector maps. It can also serve as a reference layer or basemap for myriad applications inside geographic information system (GIS) software.
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