Key technology of cloud GIS

The shortcomings of existing GIS applications are analyzed;Cloud GIS services layered model and key technologies are pro-posed based on the current major GIS application development trends.Considering the features on the spatial data resources in distributed heterogeneous environment,two integration methods are presented.Based on the GIS technical characteristics,the integration method of heterogeneous functionality resources and the application development technique based on workflow technique combined with GIS web service chaining are demonstrated.Finally,three deployment models of the cloud GIS applications are presented.