METHOD FOR IMPLEMENTING GPS SURVEYING FIELD WORK PLANNING USING 3D TOPOGRAPHIC INFORMAITON AND METHOD FOR ANALYZING 3D TOPOGRAPHIC INFORMATION
First Claim
1. A method for implementing GPS surveying field work planning by using three dimensional topographic information, comprising:
- obtaining three dimensional topographic information according to the location of a GPS receiver;
obtaining maximum topographic elevation angle information from the GPS receiver to terrain for each azimuth using the three dimensional topographic information;
obtaining elevation angle information from the GPS receiver to satellites along the satellite bearings according to the satellite ephemeris or almanac;
determining whether observation is visible according to the maximum topographic elevation angle information along the satellite bearings, and the elevation angle information from the GPS receiver to the satellites; and
estimating the positioning accuracy using the usable satellite observations.
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Abstract
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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Citations
9 Claims
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1. A method for implementing GPS surveying field work planning by using three dimensional topographic information, comprising:
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obtaining three dimensional topographic information according to the location of a GPS receiver; obtaining maximum topographic elevation angle information from the GPS receiver to terrain for each azimuth using the three dimensional topographic information; obtaining elevation angle information from the GPS receiver to satellites along the satellite bearings according to the satellite ephemeris or almanac; determining whether observation is visible according to the maximum topographic elevation angle information along the satellite bearings, and the elevation angle information from the GPS receiver to the satellites; and estimating the positioning accuracy using the usable satellite observations. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for analyzing 3D topographic information, comprising:
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obtaining topographic information; determining a location and a analysis area; obtaining topographic heights in the area with different grid sizes according to the topographic information, wherein the grid sizes are proportional to the distance between the location and the sampling points; and obtaining maximum topographic elevation angle information according to the topographic heights and the height of the location. - View Dependent Claims (8, 9)
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Specification