Design and Algorithms of a Rainfall Analysis System
降雨分析系统的设计与算法

We fully discuss algorithms of Kriging interpolation, isoline drawing and contour map fillingwhich are important in scientific data visualization and geographical information systems. Though thesetopics are classical in the theory of geographical systems and have undergone intense studies for manyyears, these algorithms are not easily found elsewhere in a so detailed and complete form, notably thecontour map filling is devised totally through our own much effort. To be more practical, we also presentthe popular DLL-and-XML-technology based architecture of a real rainfall analysis system which has beenused effectively in many cities of ZheJiang province. This greatly eased the hard task of rainfall isolinedrawing, formerly furnished mainly by hand. The sources of input rain data are vast, ranging fromrealtime recording at rain stations to the more advanced radar measurement, as long as these data werestored in databases or files. Both the algorithms and the framework of our software can be used withoutchange to other circumstance such as mountains' height contour and mineral distributions. The algorithmsintroduced here are robust and the overall functions of this software can rival those of the famous generalpurpose GIS software-Surfer by Goldensoft Corp. both in speed and appearance.