03247nas|a2200433 a 4500 20260818094044.0 060223s2005 th uu|m rtt 0| a1eng d .b11980667 AIT Thesis no.RS-05-07 Sirikul Hutasave Distribution testing of positional error for geospatial data (based on manual digitized data) Pathum Thani, Thailand : Asian Institute of Technology, 2005 60 leaves : ill. Thesis ; no. RS-05-07 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science Thesis (M.Sc.) - Asian Institute of Technology, 2005 The 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. Geographic information systems Geographical positions Chen, Xiaoyong, Chairperson Honda, Kiyoshi, Examination Committee Borne, Federic, Examination Committee Lal Samarakoon, Examination Committee Royal Thai Government, Scholarship donor Asian Institute of Technology. Thesis ; no. RS-05-07 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B09922 .b11980667 mnait u 240405 0 060203 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120591226 CREATED : 2006-03-02 RECORD # : i1247499x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120591200 CREATED : 2006-03-02 RECORD # : i12475002 LPATRON : 1021394 LCHKIN : 2009-11-18 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 2 TOT RENEW : 1 Barcode : 30050120238232 CREATED : 2016-03-30 RECORD # : i12912827 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 31175 31175 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.RS-05-07 30050120591226 2026-08-18 09:40:44 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.RS-05-07 30050120591200 2026-08-18 09:40:44 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.RS-05-07 30050120238232 2026-08-18 09:40:44 2026-08-18 40