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Research on Evaluating Indexes System of Contour Simpli-fication Algorithms

Author: YuXiaoYan
Tutor: MaJinSong
School: Nanjing University
Course: Cartography and Geographic Information Systems
Keywords: Contour simplification algorithm Geometric errors Attribute data error Evaluation
CLC: P283
Type: Master's thesis
Year: 2011
Downloads: 68
Quote: 0
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Abstract


The contour comprehensive is the cartographic generalization research in the field of hot issues. Currently, contour mapping integrated approach diverse line features simplify the algorithm, computer technology is a contour comprehensive spatial data compression method. The current line feature simplified algorithm, there are many, most of the algorithm is to achieve the purpose of reducing data amount by discarding points of the elements of the composition lines. Select spatial data point of principle as well as the search range set these methods are divided into five categories, namely independent point algorithm, a simple local search method, the constraints of local search algorithm, without the constraints of the local search algorithm , as well as the global algorithm. These algorithms simplify the process may affect the quality of the spatial data, including positional accuracy, shape and dimensional accuracy, properties, precision, and simplify the process of generating the error vary with the different algorithms or different compression ratio. With the contour simplify the deepening of algorithms, simplified after the results of the assessment methods are becoming increasingly important. Mainstream data quality assessment method is abstracted as contour the ordinary line feature from geometry, topology, analysis of the results of the simplified algorithm. These methods to meet the algorithm comparison as well as to simplify the results of the qualitative analysis of the requirements, but has ignored the attributes of geoscience contour terrain elements of the carrier has. The change from the simplified geometric distortion of the results, as well as the properties of geoscience two ways to build a universal contour simplified algorithm evaluation index system. Which geometric deformation length error, displacement error, buffer tolerance and topology errors to measure geoscience evaluation of the property changes built by contour DEM the extracted raster data attribute values ??were statistically analyzed to achieve. The article as experimental data using the the Lushan Temple of Azure Clouds contour map in five categories simplified algorithm selected 11 kinds of common algorithms are programmed, the original contour simplify. The proposed evaluation system and to evaluate the results of various algorithms simplify. The results showed that, various algorithms simplified data, the index system built from two angles of geometric deformation and properties of geoscience comprehensive comparison and evaluation, comparative results are obvious practical application can be selected according to the different needs of different combinations of indicators simplify the results were evaluated. This indicator system has certain reference value for the cartographic generalization and contour.

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Cartography ( Cartology ) > Map compilation
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