Comparative Study on Coordinate Transformation Methods of Geospatial Data in Xinyi City
For the purposes of unifying geographical standards,providing foundational datas support,and facilitating operations at various levels,Xinyi city was designated as the study area,within which 38 uniformly distributed control points were selected.Each control point had an average control area of approximately 40 km2 and an average distance of roughly 4.0 km from its neighbors.Utilizing CASS and ArcGIS software,three conversion methods—four-parameter transformation,seven-parameter transformation,and spatial adjustment—were employed to transform the geospatial data of Xinyi city from the Xi'an 1980 coordinate system to the China Geodetic Coordinate System 2000(CGCS2000).The conversion results exhibited millimeter-level accuracy.By comparing and analyzing the precision of these three methods,it was concluded that the four-parameter transformation method can also meet the engineering survey accuracy requirements within the study area.Additionally,adopting spatial adjustment using GIS software can satisfy the precision requirements for vector data conversion formats such as SHP and MDB.Furthermore,for geospatial data conversion in large-scale and large-proportion mapping,the seven-parameter transformation method is preferred.
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