The Research And Application On Area Rainfall Meteorological Based On GIS

Areal Rainfall is average rainfall of the unit area within a certain region and be able to reflect the situation of rainfall in the region objectively. It's an important parameter which describes a certain regional water resources, one of the crucial indicators in flood forecasting and a main basic data in study of water cycling. To carry out research and application of Areal Rainfall can help government organizations and relevant departments at all levels to organize disaster prevention, disaster fighting and provide an important basis for the decision-making in reservoir dispatching.It's also a significant work for enhancing the pertinence and practicality of the meteorological services.Geographic Information System (GIS) is a kind of computer system which can collect,store,manage,search,analyse,process and apply the geographical information. It becomes wider and wider in application of meteorological field for its powerful capacity for analyzing, processing and mining massive geographical data, spatial analysis and rich visualization.This paper was based on the project Areal Rainfall Service System.With the use of the introduction combined with self-developed technical line and the second development on ArcGIS Engine, the paper discussed how to use ArcGIS related technologies on.NET platform to support rainfall monitoring, the production and release of the submitted materials in Prediction Center, to support statistics,analysis and processing of various information,to customize and manufacture product graphics,thus formed professional meteorological services platform on the basis of GIS.The paper choosed two function modules of system for discussing.One was data mangnament,inquiry and analysis,the other was system automatic drawing.It Studied and analyzed the key technology and business process. In the module of data mangnament,inquiry and analysis,the paper introduced Micaps data format supported by the areal rainfall,established GIS-based database of area rainfall data,discussed how to read Micaps data and file data efficiently and achieved the result of data real-time storage and data loading.In the design of data searching, the paper studied the GIS,meteorological combined with database technology to achieve surface rainfall data query capabilities. Data query, the query interface and sql could be configured in the database directly after using the parameterized interface generation and configuration. So we could add query search function of rainfall meteorological element without modifying and recompiling code,thus improved the efficiency. In the module of system automatic drawing, the paper chose Cressman interpolation algorithm for spatial distribution graphics in the Areal Rainfall Service System after a comparative study of commonly used algorithms about areal rainfall,thus made the spatial distribution graphics of precipitation become more accurate and beautiful.At the same time,the paper discussed the method of developing various components by using ComGIS technology and how to use ArcGIS ModelBuilder modeling technology for building specific processing model for service product similar to work flow diagrams.We made thematic maps by using ArcMap to achieve a variety of formats including vector and image output. Combined with the background processing system of Meteorological Service Products,we monitored the operating conditions of the model to achieve automatic mapping output function of the system and meet the demand of specific thematic map in Areal Rainfall Service System.Thus,we increased automation and improved service means.