DEVELOPMENT OF A WEBGIS BASED AIR QUALITY GEOPORTAL FOR MONITORING AND MANAGING AIR QUALITY IN ISTANBUL

Abstract

This study describes the development of an Air Quality GeoPortal (AQG) via a Web-based
Geographic Information System (WebGIS) in Istanbul in Turkey. The system has been developed for online
use 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 monitoring
station. A prototype system is providing the viewing, querying and downloading of up-to-date air quality
maps on web pages via a Web Based GIS system based on Open Geospatial Consortium (OGC) web
services. Furthermore, the integration of a Web Map Service-Time (WMS-T) with air quality data allows
users to access previous data and related maps by specifying a time value on a web page. Thus, it is
possible to download air quality parameters in desktop GIS systems and web pages in map format for a
desired time interval. The system architecture is based on open source software integration including
GeoServer and OpenLayers functions, MySQL database for data management, with HTML, JavaScript and
PHP as programming languages in both the server and client scripting. Furthermore, the user interfaces
are programmed to provide user-data interaction via web. The application includes the facility to
download air quality data on an hourly basis raster (Tiff, Bmp, and Jpeg) and vector (ShapeFile, GML, Json
and CSV) format.

Keywords

• Air Quality Monitoring,WebGIS,GeoPortal,Web Services,Interoperability

İstanbul İlinde Hava Kalitesi İzleme ve Yönetimi için WebGIS Tabanlı Hava Kalite GeoPortalı Tasarımı

Öz

Bu çalışmada İstanbul ili için WebCBS tabanlı Hava Kalite Geoportalı (HKG) tasarımını içermektedir.
Sistem, havada bulunan PM10, SO2, NOX, NO, NO2 CO konsantrasyonlarını ve bununla birlikte
meteorolojik parametrelerin de (sıcaklık, nem, rüzgâr hızı ve rüzgar yönü) ölçüm istasyonları bazında
saatlik olarak online şekilde görülebilmesini sağlamaktadır. HKG sistemi Open Geospatial Consortium
(OGC) web servislerini kullanarak hava kalite haritalarının sunumunu, indirilmesini ve sorgulanmasını
sağlayacak şekilde geliştirilmiştir. Ayrıca WMS-T web servis standardının da sisteme entegre edilmesi ile
birlikte belirli bir zamana ait haritalara ulaşma ve sorgulama mümkün olabilecektir. Böylelikle istenilen
zamana ait hava kalitesi verileri masaüstü CBS yazılımlarında kullanılabilecek yada web sayfasında
görüntülenebilecektir. HKG sistemi openlayers ve Geoserver entegrasyonu ile oluşturtulmuş olup MySQL
veritabanı yönetim sistemi ve hem sunucu hem de istemci taraflı kodların yazılması için HTML, PHP ve
JavaScript kodlarını içermektedir. GeoPortal ara yüzü kullanıcı odaklı olarak ve verilerle etkileşim
içerisinde bulunulabilecek şekilde tasarlanmıştır. Uygulama aynı zamanda saatlik hava kalitesi verisini
raster (Tiff, Bmp, and Jpeg) ve vektör (ShapeFile, GML, Json and CSV) formatta indirmeye olanak verecek
şekilde tasarlanmıştır.

Anahtar Kelimeler

• Hava Kalitesi İzleme,WebCBS,GeoPortal,Web Servisleri,Birlikte Çalışabilirlik

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