Air Quality Data Services: Application of OGC specifications

1
IN43B-09
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_at_wustl.edu), Rudolf Husar
(rhusar_at_me.wustl.edu)
Air Quality Data Multi-dimensional,
multi-source, multi-format
OGC Open Geospatial Consortium Specifications
Web Map Service (WMS)
Web Coverage Service (WCS)
Other specs
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.
Air quality data are collected by multiple
sources including surface monitoring networks,
air-borne measurements, and satellite-borne
sensors.

• standard for requesting and delivering spatial
  map images

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

Web Feature Service (WFS)
GetCoverage
netCDF
GetMap
WCS Client

• query and delivery of discrete feature data

WCS Server
WMS Client
WMS Server
image
GeoTiff,HDF, netCDF,
Sensor Observation Service (SOS)
GetMap Request
GetCoverage Request
http//webapps.datafed.net/ogc_EPA.wsfl?SERVICEw
msREQUESTGetMapVERSION1.1.1SRSEPSG4326
STYLESLAYERSNEI_EGU.SO2BBOX-127.00,24.00,-6
6.00,50.00TIME1999-01-01T000000FORMATimage
/pngEXCEPTIONSapplication/vnd.ogc.se_inimageT
RANSPARENTTRUEBGCOLOR0xFFFFFFWIDTH700HEIG
HT350

• multi-dimensional access to measurement data and
  sensor descriptions

http//webapps.datafed.net/ogc_EPA.wsfl?SERVICEw
csREQUESTGetCoverageVERSION1.0.0CRSEPSG4
326COVERAGEEPA_CAMD_HOUR.SO2_MASSFORMATNetCD
F-tableBBOX-82.4606,42.9258,-82.4606,42.9258,0,
0TIME2002-04-01/2002-04-30WIDTH700HEIGHT3
50DEPTH99
Station-Point SQL Server, Files
Sensor Modeling Language (SensorML)

Sequence Image, file

• models and XML encoding of sensors

nDim Grid OpenDAP netCDF,
multidimensional data model
Other Traject., Events, Pics
DataFed Interoperability among distributed data
sources
Air Quality Data Services Application of OGC
specifications
Data Federation (www.datafed.net) is a web-based
infrastructure for distributed data access and
collaborative processing/analysis of air quality
data.
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.
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.
Research supported by