基于HTML5和GIService的WebGIS系統(tǒng)開發(fā)
[Abstract]:Geographic Information system (Geographic Information System,GIS) as a multi-discipline and multi-technology cross-cutting discipline, its development benefits from the comprehensive development of various disciplines and technologies. With the rapid development of computer technology, geoscience technology and network information technology, GIS has gradually developed from single machine mode to current network GIS, and to grid GIS,. The emergence of web services provides technical support for the sharing and interoperation of geographic information. The requirement of data sharing and interoperability of GIS system makes the trend of GIS networking inevitable. The emergence of web services provides technical support for the sharing and interoperability of geographic information. As a kind of network GIS, WebGIS has greatly promoted the development of GIS. This paper analyzes the shortcomings of the existing WebGIS system, discusses the application of HTML5,Web services in WebGIS, discusses and studies a lightweight and open WebGIS system model based on HTML5 and GIService, and preliminarily implements the prototype system. On this basis, the land use information WebGIS system is developed, and the system model proposed in this paper is verified. The main contents are as follows: (1) based on the analysis of HTML5,GIService and Ajax technology and their respective advantages, a lightweight and open WebGIS system model based on HTML5 and GIService is constructed, and its design idea is expounded. The prototype system is preliminarily implemented, and the realization of server side under open source software is discussed. (2) the research and implementation of prototype system client based on HTML5 is studied and discussed. This paper mainly discusses the drawing and rendering of client-side vector map based on HTML5canvas. According to the data structure of point, line and plane symbol, the drawing and rendering of point, line and surface symbol are designed and realized based on HTML5canvas,. And stored in the two-dimensional symbol library for users to call; The storage of client-side spatial data based on HTML5Web Database mechanism is discussed. (3) A land use information WebGIS system is constructed, its construction background and process are described in detail, and its related functions are programmed and realized, and the system model proposed in this paper is verified. The practice proves that the WebGIS system model constructed in this paper realizes the visualization and operation of the vector map without relying on the third party plug-in and enriches the application of the browser side. It has the typical open ability, achieves the data and function distributed layout and the sharing and the interoperation, and the system is small, portable, simple and easy to develop. In general, it has certain theoretical and practical research value.
【學(xué)位授予單位】:長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類號(hào)】:P208
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