基于MapInfo数据格式在GIS应用环境下等值线综合方法实现

等值线构建是G IS开发、数字地图绘制重要的研究内容之一。重点讨论了基于M apInfo数据格式在G IS应用环境下等值线综合方法的实现,首先根据高程采样点跟踪等高线通过点,再利用五点光滑法、正轴抛物线加权平均光滑法以及M apX提供的光滑方法对等值线通过点进行光滑处理,从而绘制出光滑度好、准确美观的等值线,同时发现M apX所提供的光滑方法可能利用的就是正轴抛物线加权平均光滑法。通过大量的数据验证了绘制的正确性。

The Integrated Method of Constructing Contours Based on the Data Structure of the Mapinfo in the Environment of Using of the GIS

Constructing contours is an important part of the development of GIS and Digital Mapping.This article introduces the implement of the method of constructing contours based on the data structure of the MapInfo in the environment of using of the GIS.The method is as follows:first,get the points which the contours get across by the height,and then smooth the points by three methods,at last draw out the smooth contours.At the same time,it is found that the smoothing method which the MapX possibly uses to smooth the contours is same as that of the average of the parabola.Experiment with so many data and tests on this system provides good results.