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035 _a.b11494128
099 9 _aAIT Thesis no. CS-95-23
100 0 _aSonglak Piriyapairoje
245 1 0 _aGIS data conversion
260 _aBangkok :
_bAsian Institute of Technology,
_c1995
300 _a47 leaves +
_e1 online resource
490 1 _aThesis ;
_vno. CS-95-23
500 _aA thesis submitted in partial fulfilment of the requirements for the degree of Master of Science
502 _aThesis (M.Sc.) - Asian Institute of Technology, 1995
520 _aA number of GIS data conversion mechanisms are available to convert raster data to vector data and vice versa. Some GIS's are able to automatically convert from one format to the others while others can operate on only a specific data format. The scanline algorithm, double run-length encoding and thinning can be handle the GIS data conversion mechanisms to improve and preserve data contents. It also provide data quality and eliminate error due to repeated conversions. In the first experiment vector data is converted to raster data. Vector data are encoded in digital line graph (DLG) which consists of the topology records of node, line and area. The scanline algorithm is used next for raster coding. The second experiment raster data is converted to vector data. To improve the quality of vector data, the double run length coding, boundary thinning and tracing by double run-length codes are proposed.
650 1 0 _aGeographic information systems
700 1 _aYulu, Qi,
_eChairperson
700 1 _aMurai, Shunji,
_eCo-chairperson
700 1 _aHuynh, Ngoc Phien,
_eExamination Committee
710 2 _aRajamangala Institute of Technology,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. CS-95-23
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B15029
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