With the development of network technology, especially under the background of marine GIS services application trend, it is ushering a new generation of marine GIS architecture. Marine GIS model as a tool to process, analyze, simulate and represent the marine GIS spatio-temporal data, particularly the marine GIS professional application model as a quantitative tool to study the marine environment, ocean system and global change, air-sea interaction, marine ecosystem, estuary coastal processes, ocean development and application, and other marine field complex problems, which can provide support to marine scientific research, teaching, engineering design, planning and management, forecasting and evaluation of the environment, sustainable development of marine economy and military marine environmental conditions. However, the distributed sharing and composition of the marine GIS model in the distributed network environment will effect the extent of marine GIS services.

Aiming at the composition techniques of marine GIS model services, this paper proposed the architecture and operation mechanism of marine GIS model dynamic composition, which can provide the overall framework and the top-level guidance for studying the key technologies of marine GIS model services composition and constructing specific marine GIS model services composition applications. This paper has made a thorough study on the key technology of the composition of marine GIS model services. Taking typical marine GIS spatio-temporal data as examples, it verifies the composition method of the marine GIS spatio-temporal analysis model services. Taking remote sensing inversion model of the polar sea ice-ocean parameters as example, it verifies the composition method of the marine GIS professional application model services. The main contents of this paper include:

(1) The architecture and the operation mechanism of marine GIS model services composition

This paper has compared the composition techniques of marine GIS model services and the traditional services composition techniques based on workflow. Then on the basis of this comparison, the architecture and operation mechanism of marine GIS model dynamic composition have been proposed, which can provide the overall framework and the top-level guidance for studying the key technologies of marine GIS model service composition and constructing specific marine GIS model services composition applications.

(2) Marine GIS spatio-temporal data and its distributed sharing architecture

This paper analyzed the characteristics of the marine GIS spatio-temporal data, and analyzed the data access methods from three respects: observation, remote sensing and numerical simulation, and described the characteristics of the marine GIS spatio-temporal data. In order to fully represent and analyze the characteristics and changing process of ocean phenomena, the spatio-temporal process was introduced, and a spatio-temporal process-oriented organization and representation method of marine GIS spatio-temporal data has been proposed. According to the data demands of the distributed marine GIS model sharing, this paper studied the distributed sharing technology of the marine GIS spatio-temporal data, and put forward the service-oriented distributed sharing system of marine GIS spatio-temporal data, and practiced the construction method of data services based on the OGC service interface specification with three kinds of typical marine GIS spatio-temporal data.

(3) The characteristics of marine GIS model and its classification system

Marine GIS models were classified into marine GIS spatio-temporal analysis model and the marine GIS professional application model. The former focuses on the graphical display, and describes the spatio-temporal relationship between ocean phenomena and property characteristics. The latter focuses on the numerical calculation, and is used to the space autocorrelation calculation and spatial structure simulation.

(4) The construction technology of marine GIS model services

This paper put forward the concept of marine GIS model sharing service platform, and analyzed the design guidelines of marine GIS model sharing service platform, and further studied the key technologies involved in the marine GIS model sharing service platform. Including，identification and particle size selection of marine GIS model services, the interface and management of marine GIS model service. This paper proposed service identification methods based on the stability of marine GIS model, and model particle size selection method, which takes the stability of the marine GIS model as an important indicator. According to the analysis of the marine GIS models, the stable models are mapped to coarse-grained model services, and the instable models are mapped to fine-grained model services. The concept of marine GIS model service interface was proposed based on the the WPS specification specification, which is the expansion of the WPS specification specification. Control and management of marine GIS model services were classified into internal management and external management, and the getPercent, getStatus and cancel functions in the marine GIS model service interface for sharing services control and status monitoring were mainly studied.

(5) The publication and management methods of marine GIS model service

According to the publication and management demands of the marine GIS model service, this paper proposed the concept of virtual communities of marine GIS model services, and put forward the architecture of the virtual community of marine GIS model service, and studied the marine GIS model service publishing method based on the virtual community architecture. This paper studied and put forward the marine GIS model service publishing method from three respects: marine GIS model service core Metadata, marine GIS model service reference metadata and marine GIS model service extended metadata. In the study of the marine GIS model service publishing method based on the marine GIS model service extended metadata, this paper proposed the extraction method of the Tags for the marine GIS model service, this method consists of four steps: 1) Extract the describe words of the marine GIS model service. 2) Calculate the weight of the describe words. 3) Construct the training data for Tags categories. 4) Extract the Tags of the marine GIS model service. This paper studied the query method of the marine GIS model services, and proposed the multi-level matching method and classification selection method of the marine GIS model services.

(6) The construction of the composition application prototype system