Use Of Gis Technology To The New Way To Get Gps Standards

With the development and application of the modern spatial technology, the collecting method of spatial data is largely changed. GPS is the technology which use the satellite to measure the 3D coordination of spatial points. Now the 2D precision of spatial points is very great, but because by usual correlation fitting method we can transfer GPS ellipsoidal height into normal height of the local Geoid is considered as mathematical curve plane ,It is not conform the fact of mountainous districts so the precision of elevation is so small that it is not satisfied with the requirement of leveling.Geoid is the reference datum of spatial data collection, so how to ascertain the Geoid, that of all over the world, that of one nation, or that of one zone, is always an nuclear task of surveying science but there is not the quick and automatic solution .The density of the required data of astronomical measurement, gravimeter survey and geodesic survey is not satisfied.The main factors to influence the Geoid s rising and falling of the mountainous districts are the acute change of the landform and the asymmetry of the mass of landform and the density of rocks. But the data of them are ample so it will be effective to dive Geoid by them.With the development of computer technology, the velocity of operation become quicker, at the same time, the application of the GIS technology become wider, Then MapObjects is developed and it may directly inverse the application of bearing ActiveX. In ActiveX objects there are properties and methods then we may program to control the appearance, action and interaction of objects by them.In this paper, basing on many documents and the study of the former investigator, a new method of GPS leveling being directly confirmed will be discussed in order to explore a method to improve precision (which is centimeter or millimeter about the height anomaly) of the engineering surveying, engineering construction and engineering research in the west mountainous districts of China (for example YunNan province). The elevation of the contour line and the density of rock will be get from the digital maps (now there are many digital maps). Basing on it, we can get the elevation of grid by interpolation and calculate the vertical inclination.