hgrs87造句

• HGRS87 replaced an earlier " de facto " geodetic system.
• Conversion from geographical coordinates in GRS80 to a projection in HGRS87 is supported by PROJ . 4 with appropriate parameters.
• Although HGRS87 uses the GRS80 ellipsoid, the origin is shifted relative to the GRS80 geocenter, so that the ellipsoidal surface is best for Greece.
• The maps used the Hellenic Geodetic Reference System 1987 ( HGRS87 or ????'87 ) which specifies a Transverse Mercatorial Projection mapping Greece in one zone.
• The HGRS87 datum is implemented by a first order geodetic network, which consists of approximately 30 triangulation stations throughout Greece and is maintained by the Hellenic Military Geographical Service.
• HGRS87 specifies a non-geocentric datum that is tied to the coordinates of the key geodetic station at the Dionysos Satellite Observatory ( DSO ) northeast of Athens ( ).
• The central pedestal ( CP ) at this location has by definition HGRS87 coordinates 38?4'33.8000 " N-23?55'51.0000 " E, N = + 7 m.
• HGRS87 also specifies a transverse Mercator cartographic projection ( TM ) with m 0 = 0.9996, covering six degrees of longitude either side of 24 degrees east ( 18-30 degrees east ).