| 摘要 |
A method for implementing GPS surveying field work planning by using three dimensional topographic information is provided, comprising the steps of: obtaining three dimensional topographic information according to the location of a GPS receiver; obtaining maximum topographic elevation angle information from the GPS receiver to the terrain for each azimuth using the three dimension topographic information; obtaining elevation angle of satellites from the GPS receiver according to the satellite ephemeris or almanac; determining whether observation is usable according to the maximum topographic elevation angle information along the satellite bearings, and the elevation angle of satellites; and estimating the positioning accuracy according to the usable satellite observations.
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