Design And Implementation Of SDCWR Evaluation Model System Based On WebGIS

Crop water requirement is an important factor for the safety of grain production,the evaluation of water demand satisfaction of contemporary agricultural crops urgently requires scientific and accurate diagnosis technology,WebGIS has been widely used in the development of agricultural information,provide accurate decision support for crop water demand evaluation.This paper combines WebGIS technology and regional crop water requirements(Satisfying Degree of Crop Water Requirement,SDCWR)evaluation model,based on B/S three-tier architecture model,Choose jQuery to build the basic framework of AJAX,using Openlayers as WebGIS development components,design and implementation of the WebGIS-based SDCWR evaluation model software system,Standardize the SDCWR evaluation data processing flow,the SDCWR evaluation model is transformed from traditional manual experimental calculation to systematic and standardized system evaluation,improve the SDCWR evaluation grading index visualization effect,it can provide certain decision support for grain security and crop water irrigation.The main work and achievements of this paper as follows:(1)Research on SDCWR evaluation model theory and development technology.This paper reviews the theories and methods related to crop water demand evaluation,on this basis,analyzes the shortcomings of the existing research,the basic principles,calculation process,data acquisition and processing specification of the SDCWR evaluation model selected by the system has been studied,combining the advantages of WebGIS system development,this paper expounds the architecture of Web Service and the principle of AJAX technology.(2)Design and implementation of crop water requirement evaluation system,based on B/S three-tier architecture model,SDCWR evalution model Choose jQuery to build the basic framework of AJAX,using Openlayers as WebGIS development components,Standard the SDCWR evaluation data input format standard,The evaluation data output model based on Shapefile and Web Service has been designed,apply MS SQL Server to build system database,and the effective access mechanism of all kinds of evaluation data has been designed,the system function modules are designed and implemented in detail,the SDCWR evaluation model software system based on WebGIS has been developed.(3)An Empirical Study on SDCWR Evaluation Model System,This paper takes Hubei Province as the whole research area,with its administrative division as the evaluation unit,according to the evaluation theory of regional crop combination,planting area and the law of water requirement in crop growth period,Select the typical 3,6,9,and 12 months as the system evaluation period,crop water demand data were collected and standardized.System application research discovery:from the overall view of Hubei province,the SDCWR evaluation index of each evaluation unit 3,6,9 and 12 was in the range of[0.2?0.4],[0.4?0.6],[0.6?0.8],[0.8?1.0],showing a typical upward trend,and the gradual downward trend from southeast to northwest,On the one hand,it validates the scientific nature of SDCWR evaluation model theory,crop water requirement is closely related to regional topography,precipitation,crop type and area,population and the distribution of industry and agriculture,on the other hand,the standardization and validity of system design and implementation are examined,we can make a useful attempt to promote the system.