000			03247nas|a2200433 a 4500
005			20260818094044.0
008			060223s2005 th uu|m rtt 0| a1eng d
035			_a.b11980667
099		9	_aAIT Thesis no.RS-05-07
100	0		_aSirikul Hutasave
245	1	0	_aDistribution testing of positional error for geospatial data (based on manual digitized data)
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2005
300			_a60 leaves : _bill.
490	1		_aThesis ; _vno. RS-05-07
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science
502			_aThesis (M.Sc.) - Asian Institute of Technology, 2005
520			_aThe study focuses on the positional error of digitized geospatial data. In GIS, geospatial data are used to define information that geographically and characteristically identifies natural or constructed features and defines their boundaries on the Earth. They include point, line, and polygon. Three samples of line object were selected for the experiment namely; contour line representing natural and curve lines; road representing artificial and straight lines; and city block representing artificial or boundary lines. As their positional error was tested, the distribution of positional error at midline almost conformed to normal distribution while the positional error at end points conformed to no theoretical distribution. There was 77% of tested data at midline points and 68% at end points lying in - of distribution region. The correlation between length and positional error showed a negative relation. This paper evaluated by a positional error model simulating the - error model suggested by Shi (2000), this result proved that this model is realistic and appropriate with the positional error of geospatial data. As the study concluded, the error band model can be adopted to test the positional error of existing geospatial data in Thailand.
650		0	_aGeographic information systems
650		0	_aGeographical positions
700	1		_aChen, Xiaoyong, _eChairperson
700	1		_aHonda, Kiyoshi, _eExamination Committee
700	1		_aBorne, Federic, _eExamination Committee
700	0		_aLal Samarakoon, _eExamination Committee
710	2		_aRoyal Thai Government, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. RS-05-07
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B09922
907			_a.b11980667 _bmnait _cu
902			_a240405
998			_b0 _c060203 _dm _ea _fu _g0
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942			_c20
942			_c40
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