Abstract
This study describes the development of an Air Quality GeoPortal (AQG) via a Web-basedGeographic Information System (WebGIS) in Istanbul in Turkey. The system has been developed for onlineuse to present the concentrations of PM10, SO2, NOX, NO, NO2 CO, as well as meteorological data(temperature, humidity, wind speed and direction) based on hourly data from each air quality monitoringstation. A prototype system is providing the viewing, querying and downloading of up-to-date air qualitymaps on web pages via a Web Based GIS system based on Open Geospatial Consortium (OGC) webservices. Furthermore, the integration of a Web Map Service-Time (WMS-T) with air quality data allowsusers to access previous data and related maps by specifying a time value on a web page. Thus, it ispossible to download air quality parameters in desktop GIS systems and web pages in map format for adesired time interval. The system architecture is based on open source software integration includingGeoServer and OpenLayers functions, MySQL database for data management, with HTML, JavaScript andPHP as programming languages in both the server and client scripting. Furthermore, the user interfacesare programmed to provide user-data interaction via web. The application includes the facility todownload air quality data on an hourly basis raster (Tiff, Bmp, and Jpeg) and vector (ShapeFile, GML, Jsonand CSV) format.
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