| Summary: | 碩士 === 國立宜蘭大學 === 土木工程學系碩士班 === 94 === Some surveyors often misapply the coordinate data in performing cadastral survey, cause of the renewal of the coordinate system in Taiwan and the cadastral survey successively adopted the measurement achievements of many kinds of different coordinate systems, and lacked the tight relation with different area. After the new TWD97 coordinate system announced, the cadastral survey results are on a basis of this new system.
In order to integrate the maps of different coordinate systems, this research adopted the least squares collocation to translate the TWD67 coordinates to TWD97 coordinates on the small area, and chose 10 4th order control points around the test area as the common point and 125 control points as the checking point. The experimental results find that the least squares collocation method combines four parameters or the way of six parameters did not have obvious difference on 125 control points precision. Only 3 control points position errors are greater than 2 centimeters, 122 control points position error are smaller than 2 centimeters, account for all count 97.6% , the greatest position error is 2.7 centimeters.
Then we translated the coordinates of all parcels boundaries points using the same transformation parameters of test area, the experimental results are：the greatest position error of parcels boundaries coordinates is 1.3 centimeters, and the land boundaries position error is 0.5 centimeters on average, 99.7% of the lengths error of parcels are within 1 centimeter, 99.6% area error of parcels are in 0.1%. So we can find that these results all conform to the cadastral survey implement law request, this coordinate transformation could be deemed to have no position error, and we can perform the cadastral survey tasks with these TWD97 coordinates directly.
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