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With the rapid development of information technologies and GIS techniques, raster data amount is growing on an unprecedented scale. Existing WebGIS based on local file systems and RDBMS cannot manage very large raster data efficiently because of limited storage capacity of single node. Although expensive storage devices are used to enlarge capacity, WebGIS is still vulnerable to suffer from single...
Environmental impact assessment is usually a necessary procedure to evaluate the impacts of a project on its surrounding media before the construction started. However, assessment of the final environmental impact on human health is usually lacked during the evaluation process in China. This paper demonstrated a web based GIS system that consists of twofold, which can aid health assessment: 1) a database...
Erhai Lake has a important role for the development of the city of Dali. After the mid-70s of 20th century, the intervention of human activities causes many problems. The lake level dropped and area reduced. Water quality gets serious by non-point pollution which leads to changes in ecological environment, biological diversity and accelerate eutrophication. With the people's improving of environment...
In order to respond to sudden environmental pollution incidents and reduce their damage and loss, an emergency decision-making system need to be built. The air pollution emergency plan system based on WebGIS, which relies on the on-site monitoring data in real time, simulates the spread and distribution of the on-site pollutants to assist decision-makers to make an appropriate emergency plans. Among...
For integrating into CWIC system, this system is implemented comply with OGC standards: Catalogue Services for Web (CSW) and Geographic information — Metadata (ISO 19115). As the data centers are isolated from each other, this system is designed as a distributed one which has one mediator and many data center nodes. The mediator receives requests, distributes them and integrates all the responses...
With the development of network technology, more and more people choose service-oriented development mode to construct WebGIS. The integration of SOA and Web Service technology has become a trend in WebGIS. However, WebGIS construction is not only an enormous but also a high cost project. Facing this problem, this paper proposed a solution for quick and efficient construction of WebGIS. Firstly, it...
With the development of informationization in our country, it becomes very imperative to informationize in the field of historical relics management. Historical relics have the great value in history science and art. In order to improve the ways and means of the survey and management of cultural relics, this paper discusses the Construction of Immovable Historical Relics Survey and Management Information...
The features of mass spatial data and the limit of Internet bandwidth are key issues which restrict the WebGIS application performance. How to implement efficient vector data compression is important during the stage of data transmission. To get high compression ratio, we propose one multilevel vector data compression method which combine lossy compression and lossless compression technology. According...
With the rapid development of Chinese urbanization and industrialization, it has become an increasingly pressing problem to alleviate the situation of blackening and stink of the urban rivers. In the requirement of controlling black-odor river, this research was operated with the support of the National Key Water Program during the 11th Five-Year Plan Period. In this study, the commonness technical...
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