The Implement Of The Fertility Evaluation Workflow Model Based On Geographic Information Services

Soil fertility, as the material basis of plant growth, largely reflects the crop growing conditions. The soil integrated fertility must also affect the degree of plant growth. With the spatial and temporal characteristics of the soil, so the GIS assisted evaluation is used frequently for the current fertility evaluation model. The GIS assisted evaluation process is simultaneously integrated spatial interpolation method and map algebra to establish the evaluation model based on traditional statistical methods. However, such model has a strong regional, not a good promotion, therefore, which needs to gradually adjust the parameters of the model in the application process.This paper analyzed and compared traditional fertility evaluation and the assessment method based on geostatistical methods and GIS technology, and discussed in detail the process of the GIS assisted fertility evaluation. Based on the evaluation process, the key processes and those easily variables of the fertility evaluation are extracted. According to the above, this study established the conceptual model and the corresponding UML models by object-oriented analysis method.Workflow pattern is mainly used in the implementation industry of the general flow at present. GIS also draw lessons the way in the process of development. The Geoprocessing method is considered to be the more popular in the building model field, besides, workflow platform also is used to build model. This study will use the above two approaches to instantiate the concept model.This article integrates geographic information services and workflow technology into the soil fertility evaluation. The data of Yidu city as an example, the implementa-tion methods of Fertility evaluation based on Geoprocessing and universal workflow in the network environment. Meanwhile, some theoretical results are raised, mainly for the following aspects:1, Research of the common workflow conceptual model Based on workflow, the fertility evaluation process is separated into data and functionality. In order to achieve the network share of data and functionality, input/output and parameters of the model are encapsulated into a network data model, processing functions encapsulated into network processing model. The data and process models meet the OWS standards, therefore, by Petri-Net in a certain order to organize the processing and data models into a way of dealing with the chain Process. Process nested multiple functions and algorithms, and through HTTP-POST way to invoke Process to achieve a specific function model.2, Instantiation of the Geoprocessing workflow modelUse Geoprocessing model provided by ESRI detailed analysis of each input/output functions and parameter settings to separate fertility evaluation data and functionality. Then build a stable fertility treatment process and flexible workflow model of parameter input. This method realized the instantiation of fertility evaluation workflow model, and reduced the human workload of fertility evaluation. To demonstrate the practicality and scalability of the Geoprocessing-based model, the original model was reconstructed by adding raster calculator function. However, the disadvantages of Geoprocessing-based model are that it only applied to local computer and difficult used by non-professionals which are not conducive to popularization of a special model.3, Instantiation of the Web Service Workflow ModelFor building workflow model based on the network implementation process and achieving online fertility evaluation, specific method is proposed for sharing data and Geoprocessing functions and service portfolio on the basis based on of the reference conceptual model. All data and processing functions of the method are encapsulated into OGC-compliant services. Yidu Honghuatao town data, for example, the data and functionality are deployed as OGC-compliant services to share data and functionality by GeoServer and52°North. Geographic information service interface is packaged into various activities in the designer. Connecting the various activities to process chain, it can achieve a common network fertility workflow model using HTTP-GET/POST way to invoke the deployed service.This article integrates OGC and workflow technology into the soil fertility evaluation to improve the technical aspects of soil fertility evaluation methods, and draws some conclusions.1, Implementation method of a common network workflow conceptual model based on data and functions is proposedThe data and functionality of fertility evaluation are packaged to meet the data and functionality of the model OWS. Borrowing Petri-Net to organize the models into the processing chain, and implement generic workflow distributed deployment combinations and call of data and functions.2, Building such a network workflow model is feasibleResearch shows that Geoprocessing functions and data can be shared by OGC standard. It’s achievable by workflow technology to build workflow model network environment. The fertility evaluation workflow model restructured to demonstrate the flexibility of the workflow model. This study also demonstrated the method of workflow model construction can indeed achieve fertility evaluation of the network environment, and improve the efficiency of fertility evaluation.3, Propose a new research direction for soil fertility evaluation and network sharingThis paper presents new research direction for soil fertility evaluation by sharing fertility evaluation model in the network. Meanwhile, the method of model building and network deployment of data and function, not only reduces the workload for the soil workers, but also provides a new reference method for sharing research network model.