Application Of WebGIS To Climate Prediction

With the development of social and progress of S&T, the application of WebGIS becomes more and more popular, we can see the example in industry, agriculture, construction etc. Just for the WebGIS technology, we understand the space data more clearly, it transform number to picture, which makes the static digital become vividly. This not only provides us the information on time, but also gives us the web page to browse it whenever and wherever possibly. And also it takes great convenience to science research and production and living. What's more it provides the reference for researchers. How to use this technology to climate prediction is the key issue addressed in this paper.The purpose of this study is to display the climate prediction on the GIS map and post it on the Internet. The vivid picture of climate distribution changing with time on makes climate prediction visualization on the Internet, and provides clear way of browsing and query, so the researches could get the more exact information, also it provides important foundation to the agriculture producer.The development is ArcGIS and the implement data is climate data provided by International Meteorological Center. The research's development is Windows XP+Visual Studio 2005+ ArcGIS +.Net+JavaScript+Ajax.This paper solve several puzzles. First, climate distribution isosurfance and clipping boundaries. Sencond, add the isosurface to map. Third, transform the climate data.The problem-solution approaches are as below.Firstly, the problem is to implement the isosurface of climate or insects distribution, you should deal it with interpolation technology, then post the distribution on the Internet. For the problem you should use ArcGIS Server, ArcGIS Server has no interpolation function, but ArcGIS Engine has interpolation function, so you have to call the function of ArcGIS Engine with ArcGIS Server, which called'post-process calls'. In this processs, there are two objects, sever object and engine object. But they could not call each other, once do this, the system will throw exception. To solve this problem, I transform the engine code to server code, and then create an server object with the function Servercontext.create- object(). Recently, the information about this is very rare, and there is few people who know this solution in China. The clipping Boundaries question is similar to this, and so I do not introduce here.Secondly, to add the isosurface to map, and the solution is as below codes. During this process, the property setting is the key issue for this problem.Thirdly, to transform the climate data to the data form that the map need, you'd better have some knowledge of geographical. My major is Science Computer, it seems a little difficult for me. The problem is that the coordinate system of climate data and the map do not match each other, you have to transform one of them to the other's, or transform both of them to another form, for convenience and according to the characteristics of GIS map, I transform the climate data coordinate system to the map's. Here I transform it with a third party software named Coord MG, which I implemented and lose many times, at last I found.For a good understanding of IDW, also the interpolation and fitting algorithms are in common usage, this paper introduces them detail. We will use Interpolation and fitting when we build models. According to the known data, we can get the unknown with interpolation. Then with fitting algorithms, we can draw the lines similar to the data connection. Also these functions can be provided for the subsequent data analysis. Many WebGIS application, require the two algorithms. Therefore, the author achieved by programming the two algorithms. Currently, the interpolation and fitting algorithm has been very mature, there being no improvement on these two algorithms.This research of WebGIS is cutting-edge in China, and also could be used in other fields, like birds'distribution, virus distribution et al.For WebGIS, the map resource is very valuable. Google Maps with Google Maps of itself, other WebGIS platforms all need map resources. Map file used by ArcGIS format. Mxd, and . Shp format file can be transform to. Mxd file by ArcMap, or you can store. Mxd files in the database.The application of WebGIS to climate prediction is main about the WebGIS technology, the author descript WebGIS and ArcGIS in big paragraphy. On one hand, the research use many new technology you may know little, on the other hand, for learner, it will be a good reference for you to study WebGIS.The prediction of climate is about to use the future climate data. But in the study, the author did not get the resource for it is not public. With the old data of one day's climate data, the implement result is very good. Here you just understand the theory, and you can use it in many fields, like insects, birds, virus et al. distribution. Recently, though the WebGIS is widely used, not well, so there is a long road to go and more difficult problem will come. But we believe we can grasp it and get benefit from it. In another hand, ArcSDE is about space data, it has development prospect, so whether can we use it in climate prediction is a matter of concern for future.