| 摘要 |
PURPOSE:To enable accurate conversion of a three-dimensional position coordinate data of an object to be measured obtained using a satellite into a two-dimensional position coordinate data suitable for the processing at the subsequent stage auto matically. CONSTITUTION:Conversion is performed by a Japanese geodetic system conversion processing 81 from a three-dimensional position coordinate data X, Y and Z of an object to be measured on the earth as obtained using a GPS satellite to three-dimensional position coordinate data X1, Y1 and Z1 of the object to be measured in the Japanese geodetic system. The calculation of the latitude and the longitude of the object to be measured is performed by latitude/longitude calculation processing 82 from the three-dimensional position coordinate data X1, Y1 and Z1. Calculation of a two-dimensional position coordinate data of the object to be measured from the latitude and the longitude is accomplished by a two-dimensional position coordinate calculation processing 83 within a two-dimensional plane of the Japanese portion as viewed from above. |
