| Scenario |
Yilan county has been a very popular tourist area in Taiwan due to the beautiful landscape with some lakes; the major earth water body includes Lanyan river, Dezikou river, Lotong river, Yilan river, Dongshan river and Xincheng river. However, with the rapid development in transportation in recent years, more and more people are attracted to visit her, contributing more prosperous and growing commercial activities. Thus, more and more garbage increase as well. Great amount of discards are thrown into rivers and lakes, which not only influences the appearance but also damages the original water ecology and the environmental sanitation.
In order to maintain and protect the river environment, the Environmental Protection Bureau of Yilan County constructively begins to clean surface of water body such as rivers or lakes and to investigate the water pollution, expecting to provide some basic data for pollution basis through GIS system and to assist in decision-making, and to improve the water quality and increase the management efficiency. |
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| Goals |
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Quality of Water Body and Pollutant Management Interface |
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| Environmental Protection Bureau of Yilan County expects to develop a complete set of spatial database about water body and pollutant; meanwhile the standard operation procedure for database creation is designed to help rapidly generate correct results for maintaining and updating data in the future.
In addition, as the system collocates with river watershed spatial data query system, the internet service platform can act as a single window interface for query purpose in front-end or for management purpose in back-end. Therefore, the related staffs can browse, query, edit, add or manage data
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| simply through the internet service. Moreover, through the application of the mechanism of central management, dispersed application, and data sharing, the business unit staff will be more willing to utilize file, and the manipulation will become much easier as well, which will significantly increase the precision and width for decision-making. |
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| Solutions |
This project is planning to use SuperWebGIS and program design to build up a set of system with database management and WebGIS functions, which is Quality of Water Body and Pollutant Management System.
Through the system, the related staffs can display files and charts, query, position and modify files online through WebGIS without installing any internet browser plug-ins. As a result, the staffs of the bureau can easily position the needed information through the system and do the advanced analysis with GIS tools. Additionally, the business unit can upload the existing information to database then display in the form of WebGIS to share information with the public.
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| System Architecture |
Besides, in respect of data exchange mechanism, the system supports WMS (Web Map Service) developed by OGC (OpenGIS Consortium). |
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| Results |
Quality of Water Body and Pollutant Management System is designed with water quality of all body of water, pollutant query and GIS position as the major part. With WebGIS technology applied, the WebGIS system is created for multiple-online query and position functions.
The system function architecture can be divided into four parts: Basic Map Manipulation, Thematic Layer Query, GIS Position as well as File Editing and Management. Please refer to the chart below.
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| System Function Architecture |
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Basic Map Manipulation: |
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Quality of Water Body and Pollutant Management System provides various map navigation tools, such as Zoom to Full Extent, Zoom In, Zoom Out, Pan and Measure tool, to allow users to do basic browsing. |
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| 2. |
Thematic Layer Query: |
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Users can use Quality of Water Body and Pollutant Management System to query data of the animal husbandry, the controlled industries, drain system and water quality monitor station layers. By clicking any point of any described layers on the map, users can see the attribute information of the clicked point showing on the screen. If users click any point of any monitor station of the water quality monitor station layer, the monitor value of the station can be queryable and the diagram of curves will be drawn according to the annual data for user’s comparison.
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| The query window of water quality monitor data |
Or users can use Query Upstream Pollutant or Query Pollutant to quickly find out the pollutant of specific stream. Then, through clicking the pollutant’s point, the attribute data will be obtained; therefore the correct solution can be drafted.
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| Query Upstream Pollutant function will mark the pollutant of the specific section in red frame for users to recognize the right pollutant. |
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| 3. |
GIS Position: |
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Quality of Water Body and Pollutant Management System provides five orientation methods: Coordinate Position, Township and Village Road Position, Address Position, Landmark Position and Layer Position. Users can choose the suitable method and rapidly and efficiently get the searching point through clicking the list. |
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File Editing and Management: |
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The account authentication mechanism is used as the foundation of the system to manage the web. Through the level of account authentication, users can manage the account, layer or edit layer field and point according to their own authentication to effectively maintain and update database. |
Quality of Water Body and Pollutant Management System not only assists the local authority concerned about the quality of water body but also allows related units to trace the pollutant instantaneously as the abnormal condition occurs to prevent pollution from getting worse. Besides, Quality of Water Body and Pollutant Management System also provides a cross-unit service platform for integration of geographic information file and system, which will simplify the procedures, reduce administrative cost, increase water quality controlling efficiency and significantly improve the current water quality situation in Yilan county. |
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