| Forestry informatization is not only an important part of modern forestry construction, but also an important means to promote the development of forestry science. At present, our forestry informatization construction has some problems:the construction of application systems lacks unified planning; the system integration lacks unified framework while the integration degree is quite low; the integration platform lacks unifrom interface standard, etc. Therefore, how to take advantage of the advanced theory and technology to integrate forestry multi-application system and to create a unified digital forestry information platform and then promote scientific forestry decision-making, standard work and convenient services becomes an urgent and important issue. The research content of this article comes from "Guangzhou digital forestry and famous trees protection system construction project"(No:GZIT2010-ZB0533). The paper summarized current research and development trend of internal and external digital forestry and multi-system integration. It also deeply researches the current situation of forest resource, digital forestry construction status, local social economy and nature geography summary of Ghuangzhou city on the basis of system science, information science, management science, economics and software engineering theory. By using3S integrated technology, database technology, data mining technology, multimedia technology, virtual reality technology and system engineering method, the paper develops following researches about Guangzhou digital forestry multi-system integration:(1) The relative theories and technologies of multi-system integration are studied combining with the characteristics of digital forestry. A technology architecture which called "microkernel+plug-in" that based on the SOA theory and Web Service is built. The core functions are packaged as system kernel and be released in a service pattern. Meanwhile, other functions are extended based on interfaces and specifications of service and then provided as plug-ins.(2) Combining with similar internal and external researches, the necessity of digital forestry multi-system integration research is discussed based on the full analysis of roles, functional structure, databases of digital forestry applications and its relationship. The goal of digital forestry multi-system integration is cleared and the overall logic frame is designed.(3) The digital forestry multi-system integration platform has been constructed and the hierarchy construction, overall business logic and functional construction are all designed. The software and hardware environment of the platform are planned as well as the net logic and topology construction. According to database theory, all the database of the integration platform are analyzed and designed, including basic geography database, forestry special topic database, etc. Meanwhile, the hierarchy construction from logical design of databases to spatial data, reference design and storages of vector data and raster data are all well constructed.(4) The interfaces of standard services, space functional services, business data services of the platform are all established. The service registration and publication, service searching and calling, service customization are studied in a system and detailed way. A resource catalogue management system is developed to release relative description of manage data sets and various services that provided by the platform. By using this system, users can get all spatial data classified information and external service interfaces that provided by platform.(5) A unified framework of application systems provided by platform is designed, which provides a uniform interface frame, task frame, authority system and other basic supporting frames for application system construction. The secondary development mode of application systems based on the framework is designed which called "service+adapter+Open API". The relationship between application systems and approval system and three level application modes of the application system are analyzed.(6) The business customization platform is built based on SOA theory, and its overall structure and functional structure are designed in detail. The specific steps of the business customization are also given based on the platform. Most of the business can be finished by using the platform and form a plug-in, and then integrated plug-ins by the system framework of platform application system. It reduces the coupling between components and realizes software reuse in a higher level. Besides, it also helps on improving system compatibility, scalability, flexibility, reliability, network support and realizing seamless integration of the software.(7) Spatial distribution and properties of the geographic entities about forestry spatial data involves the country’s political, economic and military sensitive information. In order to ensure their safety, deficiency of the data encryption of resulting sequence by using logistic chaos mapping are analyzed. Moreover, an improved algorithm aimed to this deficiency is proposed and the flow of data encryption using this algorithm for forestry spatial data is given. The sequence created by this algorithm has better randomness without blank window and stable window. Furthermore, it has better uniform distribution and larger key space. Experiments show that encrypted image has completely chaotic state to achieve excellent confidentiality effect by hiding point coordinates and the relative position between geographic entities.(8) The production process of forestry thematic maps is complex and the cost is very expensive, so protecting its copyright has great significance. The invariance property of JPEG compression is analyzed. Then a DCT digital watermarking algorithm, in which watermark information is embedded in median and high frequency coefficients of forestry thematic maps, is proposed. As a result, this proposed algorithm has larger embedding capacity and better imperceptibility. After loss compress to forestry thematic map with quality factor that higher than preliminary value, the algorithm can accurately extract embedded watermark while robustness against noisy can be maintained.(9) Digital forestry multi-system integration is a comprehensive systematic project which involves many departments, multi-disciplinary, and it also includes the integration of people, organizations, technology, data, application and service. At the same time, it is constrained by many factors such as natural environment and social economy. Therefore it has a large amount of information and strong dynamic characteristic. With the acceleration of ecological environment construction and higher requirements of digital forestry construction, the research of digital forestry multi-system integration has significant meaning but still has a long way to go. |
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