Air Quality Data Services: Application of OGC specifications Air Quality Data: Multi-dimensional, multi-source, multi-format Point observations are collected by fixed-location sensors and mapped into a relationship database. The station information (lat, lon, name, etc) is captured in a station table that can be serve the station information as a WFS . The descriptive information identifying the type of sensor, such as pollutants measured, method used, sampling frequency, and sampling duration are collected in parameter table. This information can be encoded in SensorML and accessed through SOS . A central fact table of observations is continually updated as newer observations are collected. The observations are associated with a station id, date/time, and parameter and can be served as a WCS or SOS and visualized through a WMS or other viewer services. Application of OGC Specifications to Air Quality Information Systems Center for Air Pollution Impact and Trend Analysis (CAPITA) Washington University in St. Louis Contacts: Stefan Falke (stefan@wustl.edu), Rudolf Husar (rhusar@me.wustl.edu) OGC: Open Geospatial Consortium Specifications DataFed: Interoperability among distributed data sources Data Federation (www.datafed.net) is a web-based infrastructure for distributed data access and collaborative processing/analysis of air quality data. Research supported by: Web Map Service (WMS) Web Feature Service (WFS) Web Coverage Service (WCS) Sensor Observation Service (SOS) IN43B-09 Air quality data are collected by multiple sources including surface monitoring networks, air-borne measurements, and satellite-borne sensors. multidimensional data model Station-Point SQL Server, Files… Sequence Image, file nDim Grid OpenDAP netCDF, … Other Traject., Events, Pics Characterizing air pollution with these data involves multi-dimensional analysis over x,y,z spatial dimensions, the temporal dimension, and across multiple parameters. The Open Geospatial Consortium (OGC) specifications focus on the spatial dimensions (maps) but can be extended and adapted to support standardized queries to non-spatial dimensions of the data space. WMS Server GetMap image http://webapps.datafed.net/ogc_EPA.wsfl ?SERVICE=wms &REQUEST=GetMap &VERSION=1.1.1 &SRS=EPSG:4326 &STYLES= &LAYERS=NEI_EGU.SO2 &BBOX=-127.00,24.00,-66.00,50.00 &TIME=1999-01-01T00:00:00 &FORMAT=image/png &EXCEPTIONS=application/vnd.ogc.se_inimage &TRANSPARENT=TRUE &BGCOLOR=0xFFFFFF &WIDTH=700 &HEIGHT=350 GetMap Request Sensor Modeling Language (SensorML) WMS Client http://webapps.datafed.net/ogc_EPA.wsfl ?SERVICE=wcs &REQUEST=GetCoverage &VERSION=1.0.0 &CRS=EPSG:4326 &COVERAGE=EPA_CAMD_HOUR.SO2_MASS &FORMAT=NetCDF-table &BBOX=-82.4606,42.9258,-82.4606,42.9258,0,0 &TIME=2002-04-01/2002-04-30 &WIDTH=700 &HEIGHT=350 &DEPTH=99 GetCoverage Request WCS Server WCS Client GetCoverage GeoTiff,HDF, netCDF,… netCDF Other specs: multi-dimensional access to measurement data and sensor descriptions standard for requesting and delivering spatial map images standard for query-based access to and delivery of multi-dimensional data models and XML encoding of sensors query and delivery of discrete feature data Implementation of OGC specifications makes the data available in multiple formats and usable by a variety of clients as either maps, time series plots, or tables.

multi-dimensional access to measurement data and sensor descriptions

standard for requesting and delivering spatial map images

standard for query-based access to and delivery of multi-dimensional data

models and XML encoding of sensors

query and delivery of discrete feature data