摘要
等值线是反映空间地理信息数据关系的最重要的表现方式之一,但编程实现等值线的绘制并用其进行GIS软件的二次开发却并不容易。在实际开发降雨分析系统的基础上介绍了在数据可视化和地理信息系统中非常重要的等值线绘制和轮廓图填充算法,并且给出了基于动态链接库和XML技术的模块化系统整体架构。实际的绘制效果与计算速度可与美国GoldenSoft公司的著名软件Surfer相媲美。降雨数据来源包括以数据库和文件存储的一切实测、遥感数据。该系统已在杭州、温州、上虞、金华、台州等多个地市的防汛抗旱部门投入使用,改变了原先等值线主要由手工绘制的情况。本系统可以同样用于等高线的绘制。
We fully discuss algorithms of Kriging interpolation, isoline drawing and contour map filling which are important in scientific data visualization and geographical information systems. Though these topics are classical in the theory of geographical systems and have undergone intense studies for many years, these algorithms are not easily found elsewhere in a so detailed and complete form, notably the contour map filling is devised totally through our own much effort. To be more practical, we also present the popular DLL-and-XML-technology based architecture of a real rainfall analysis system which has been used effectively in many cities of ZheJiang province. This greatly eased the hard task of rainfall isoline drawing, formerly furnished mainly by hand. The sources of input rain data are vast, ranging from realtime recording at rain stations to the more advanced radar measurement, as long as these data were stored in databases or files. Both the algorithms and the framework of our software can be used without change to other circumstance such as mountains' height contour and mineral distributions. The algorithms introduced here are robust and the overall functions of this software can rival those of the famous general purpose GIS software-Surfer by Goldensoft Corp. both in speed and appearance.
出处
《遥感技术与应用》
CSCD
2004年第4期284-289,共6页
Remote Sensing Technology and Application
关键词
XML
插值
等值线
轮廓填充
XML, Interpolation, Isoline, Contour fillings
