7 August 2007 Improving method of line (area) buffer creating model used in MapInfo
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Abstract
Both the "Earth" coordinates system and "Non Earth" coordinates system are the coordinates systems mostly used in the GIS software nowadays. In the former coordinates system, the earth is treated as a sphere and in the latter one; all the spatial analysis models are based on the Euclidian Plane. The different coordinates system has the different usage: the "Earth" coordinates system is applied to the spatial analysis of large-scale areas and the "Non Earth" coordinates system is applied to local areas. The error will be made if the usage of the systems is exchanged. Through the analysis of typical MapInfo point and line (area) buffer creating examples, the inaccuracy of MapInfo line (area) buffer creating model based on map projection plane has been found. Analyzing and validating its reason, the improving ideas and methods are given out: constituting line (area) buffer creating model by MapInfo point buffer creating model and convex hull creating model; constituting line (area) buffer creating model based on the earth ellipsoid. This paper not only provides an idiographic method for MapInfo users to improve the accuracy and reliability of spatial analysis, but also reminds users not to abuse the buffer analysis tools. On the other hand, this will put forward a good reference for the new version of MapInfo system and other GIS developers.
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R. C. Peng, R. C. Peng, Y. Chen, Y. Chen, G. H. Liu, G. H. Liu, L. X. Guo, L. X. Guo, Y. D. Zheng, Y. D. Zheng, H. R. Chen, H. R. Chen, "Improving method of line (area) buffer creating model used in MapInfo", Proc. SPIE 6754, Geoinformatics 2007: Geospatial Information Technology and Applications, 675409 (7 August 2007); doi: 10.1117/12.764589; https://doi.org/10.1117/12.764589
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