Overall, the assessment of error suggests a point accuracy of [+ or -] 1 m for both the DOQQ and GPS-based shoreline maps.
Combining a sub-meter-accuracy Global Positioning System and a 1-m-resolution DOQQ to map shoreline change provided a level of point accuracy of [+ or -] 1 m and distance accuracy of [+ or -] 2 m.
Geological Survey (USGS) DLG, DRG, DOQQ
, DEM, GNIS, National Atlas, Landuse, Landcover, GLIS Microsoft TerraServer Digital Orthophoto (originally from Soviet satellites and USGS DOQQ
) EPA AILESP, NPL, Superfund, CERCLA water quality, environmental facility Michigan DNR MIRIS Databases.