Partial Contour Interpolation Algorithm Based On Field Analysis

Contour lines expression is the important issues in the expression of cartography and GIS systems, which reflects the undulating characteristics of the geomorphology, has broad applications in a visual expression of computer geographic information, such as the three-dimensional simulation, the terrain modeling, and also plays an important role in GIS spatial analysis, ect.In this article, we compared the popular current contour line interpolation algorithms, and discussed their characteristics.In this paper, in order to obtain accurately the terrain elevation information from the map, we studied the changing laws of the contour lines shape, analyzed the shortcomings and errors of the existing algorithms, and then discussed the similarity laws of contour lines shape changing in view of field theory. In accordance with the laws, we present the local interpolation and central axis isoclines model to describe the contour lines similarity transfer. Finally, we used the models to analyze the existing interpolation algorithms, and the experimental results show that the initial shape of the contour lines has no limitation on the local contour interpolation algorithm based on the field theory, can obtain the interpolation data of describing 3-D terrain elevation undulation when the initial contour lines has poor smoothness property.In short, there are two purpose of this dissertation. First, we prove the uniqueness and effectiveness of the contour lines interpolation theoretically, so that contour interpolation was changed to be a scientific problem form a empirical one. Secondly, we explore the precise and efficient vector contour lines data interpolation algorithms to meet the need of high-precision applications.