COORDINATE TRANSFORMATION OF DIGITAL MAP BASEDON COLLOCATION BY TWO MINIMIZATION STEPS
Zeng Anmin 1,2) ; and Zhang Juqing 2)
1)Xi’ an Information Division of Surveying & Mapping,Xi’ an 710054 2)School of Geological & Surveying Engineering, Chang’an University, Xi’an, 710054
Abstract After having reviewed the basic collocation theory, the principle of the collocation by two minimization steps is introduced. Considering that the stochastic signal contains not only the stochastic information but also some systematic trend, after the systematic trend parameter having been calculated and then the residual was used to compute the covariance function of the stochastic information. With the refitted covariance function, the stochastic signal was evaluated and the systematic trend parameters were estimated again. An actual digital map case shows that the solution accuracy with this method for collocation is better than that with the affine transformation by least squares.
Key words ：
collocation
covariance function
two minimization steps
digital maps
coordinate transformation
Received: 01 January 1900
Corresponding Authors:
Zeng Anmin
Cite this article:
Zeng Anmin,and Zhang Juqing . COORDINATE TRANSFORMATION OF DIGITAL MAP BASEDON COLLOCATION BY TWO MINIMIZATION STEPS[J]. , 2008, 28(1): 81-84.
Zeng Anmin,and Zhang Juqing . COORDINATE TRANSFORMATION OF DIGITAL MAP BASEDON COLLOCATION BY TWO MINIMIZATION STEPS[J]. jgg, 2008, 28(1): 81-84.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2008/V28/I1/81
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