ArcGIS9 provides a common coordinate system, coordinate conversion, coordinate transformation can be achieved using the WGS84 and Beijing 54, Xi'an 80 coordinate conversion between. Has been such a coordinate conversion is not feel are accurate, but should also be summoned up the courage, how to control it in a few meters Wucha no problem can basically meet. Recently made a project, one step is to test IKONOS, SPOT5 no control points such as remote sensing image positioning accuracy to 10 000 topographic map data as a standard.
The IKONOS images and other data is in WGS84 UTM coordinate system, 10 000 topographic map mainly based Xi'an 80 coordinate system. In operation, first of all be unified coordinate system, the project is 10 000 topographic map data into WGS84 coordinates system, began to use ArcGIS coordinate conversion, the 10 000 topographic maps to WGS84 UTM coordinate system, was found to test results of positioning accuracy is very poor, they begin to doubt the accuracy of this coordinate system conversion problem. So please Xi'an earth was accurate coordinate transformation, transformation in the sub-meter level precision control plane.
The following figure 1, using exact coordinate transformation for comparison, the red line for the 10 000 topographic maps, there is the image position accuracy error
The figure 2, using ArcGIS software for coordinate transformation, the blue line for the 10 000 topographic map
The results secret, could not be released, preliminary estimates a bit, ArcGIS map coordinates of the site for conversion error of 86 meters, mainly in the X direction, the accuracy of the resource application may be able to tolerate the error, but the mapping, engineering, etc. application may not meet the requirements, so the coordinate transformation in the use of ArcGIS need to pay attention to this issue before, or will affect the results of your analysis.
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