A Study on the Quality of Contour in Different Periods
Date Issued
2006
Date
2006
Author(s)
Lai, Yi-Shu
DOI
zh-TW
Abstract
A map is the most important geographic model as well as a language of geography. In all kinds of maps – from the initial strategic meaning to the recent academic research, the base maps that have been used the most frequently are topographic maps, where contour maps are the most common maps among those topographic maps. However, the ways of drawing contours are using measurements and then drawing them on the maps artificially. It is hard to avoid the appearance of errors in such manual operation. The questions that this research is going to study are whether the appearances of errors are on a regularity basis and whether different measurement methods result the same types of errors.
Since the beginning of the 20th century, many series of topographic maps have been drawn in different years. The most representative topographic maps include the maps published in 1904 and 1920.Thereafter, the Combined Logistics Command continuously drew new maps based on those older maps. These topographic maps were drawn using various surveys and drawing methods. Therefore, the contours of a same area may have different contour patterns, suggesting that existing errors may be hiding within. This research is aimed to inspect the differences in these maps and explore the sources of errors.
Subjects
地形圖
資料品質
Topographic Maps
Contour
Data Quality
Type
thesis
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