Research On Composition Model Of Spatial Information Service Of Land And Resources Department Based On Cloud Computing

In recent years,the land and resources department has built a “land resource cloud” with the support of big data and cloud computing technology,and has paid more attention to the application of spatial information services under the cloud environment.On the one hand,the amount of spatial data of land and resources is huge.The use of cloud computing technology can make the data analysis capability of spatial information services faster.On the other hand,there are many different related businesses of land resources,and spatial information services with different functions can be configured to meet different requirements.However,when the spatial information service is actually used,a single information service often cannot actualize complex spatial business applications,but by combining multiple single services,can get more powerful composite services to meet requirements.This paper focuses on the research of the combined model of spatial information service,by using Business Process Modeling Notation(BPMN)to describe the combined model semantically,relying on the characteristics of BPMN to understand and use,and through the relevant business process engine and tools to achieve rapid construction and correctness test.The main research contents and results are as follows:1.Building a spatial information service registry.Based on the Consul service management framework,the Universal Description Discovery and Integration(UDDI)specification is followed to build a registration center suitable for spatial information services,providing functions such as service lookup and service invocation in the form of service catalogs,which provides a guarantee for the rapid construction of the combined model.2.Using the extended semantics of the task elements of BPMN to control the connection of service parameters of the model in the modeling process.The modeling technique used in this paper is a static service composition model,which requires service binding in the model construction phase.The combined model constructed by BPMN lacks the description information of the service parameters,which makes the service chain difficult to guarantee the connection of service parameters.By extending the semantics of the task elements,adding description information of service parameters,and using the parameter indexing method of this paper,it can effectively guarantee the model's cohesiveness in construction.3.Formulate the mapping rules of BPMN elements to Petri nets,and verify the correctness of the process network.There is no effective verification method for the correctness of the BPMN model,but Petri nets have many effective process network analysis methods as classical mathematical expressions.By studying the characteristics of BPMN elements and model structure,modeling characteristics of Petri nets,etc.Develop a mapping rule table of common BPMN elements to Petri nets,map the BPMN model into a Petri net with corresponding structure according to the rules of the table,and verify the correctness of the BPMN model by analyzing the Petri net indirectly.Based on the above research content,this paper applies the research results to the construction of the system platform.The feasibility of the BPMN spatial information service portfolio model based on workflow model is verified by an urban space selection case.