Note: the resolution of the following illustrations is 1/10 of a degree. Previously, some of the BLM coordinates were based on the NAD27 datum, which led to a displacement of several hundred feet when plotted on the WGS84 Google Earth.ģ) New section coverage for southwest Alaska.Ĥ) Better section coverage along the California coast line. However, this spring, the data was not ready, so it has been almost a year since the last update.ġ) The coverage of quarter-quarters is expanded by about 20%, but within these areas, there are still quite a few gaps.Ģ) Alaska sections are correctly located.
Please try a few yourself, compare the results to a known system, such as CORPSCON, and add a comment to let everyone know the result.Īlso, please post any suggestions you might have about the state plane utilities.Ībout twice each year, the Earth Point gets new township and range data from BLM. I have tested points in all 124 zones (plus three additional zones for Maine 2000). The ConvertCoordinates page accepts State Plane coordinates for conversion to Latitude/Longitude, UTM, and MGRS. Individual coordinates can be mapped onto Google Earth. Other coordinate systems, such as UTM and MGRS, are also included. The StatePlane page converts State Plane coordinates to Latitude/Longitude and back again. An example spreadsheet is available: StatePlaneExample.xls The ExcelToKml utility maps a list of State Plane coordinates onto Google Earth, where they can be viewed easily and shared without the need to load them into a larger mapping system. These flat-plane projections allow measurements to be made using simple Cartesian coordinates, thus avoiding complex spherical or ellipsoidal calculations of distance, angle, and area. Each state is divided into one or more zones based upon Transverse Mercator, Lambert Conformal, or Oblique Mercator projections. The coordinate system was developed in the 1930's, before the advent of computers or GPS, and is used by mapping professionals in all 50 states. Earth Point now supports the State Plane coordinate system.
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