air quality assessment & management
Reference and User Manual
AirWare   On-line Reference Manual
  Release Level 7.0
  Revision Level beta
  Release Date 2015 03

Area Sources

Area sources represent distributed sources of small stacks and chimneys and fugitive emissions.

The default Data Structure and data base representation of area sources is defined by the object header and the open list of attributes defined in the HTML OBJECT TEMPLATE.

They can represent

  • industrial areas or individual enterprises (possible in combination with one or more point sources and associated with a plant OBJECT);
  • commercial (e.g., gas stations) or residental areas;
  • city areas representing diffuse contributions from the transportation system including both moving and stationary vehicles;
  • intersections as "hot spots" of the transportation network if not covered by appropriate line sources.
All area sources are OBJECTs and have the standard OBJECT META DATA associated that include:
  • name, short descriptiopn, owner, creation and last modification date of the data set;
  • georeference: symbolic, by a reference point (center of the rectangular bounding box of the polygon, see below);
  • OPTIONAL Hypertext description (with import function);
  • Type specific attributes (Descriptors):
    • ISIC classification;
    • Type (describing a sectoral classification,e.g., commerical, industrial, residential, public, traffic)
    • average height;
    • total area;
    • primary fuel;
    • fuel consumption (kg/day)
    • an optional link to a contact address for larger objects/buildings.
DATA SUMMARY: Area sources
Location: Province
Location: Community
Category (symbolic)Residential Areas, Airports, Industial Park...
Year of constructionbegin of operations
Source size (symbolic)very small, small, medium, large, very large
Fuel type (symbolic)list of legal values from the knowledge base
Fuel consumption average [kg/year]
Total Area [km2](consistency with GIS polygon representation ?
Average Height [m]
Emission Data, average [g/s]NOx, NO,NO2, SO2, PM10, PM2.5, CO, VOC
GIS Data
  • Type specific geometry: georeference (beyond the symbolic association with a province/county/community include:
    • the reference point;
    • a circle (defined by the reference point and the radius derived from the total area;
    • an arbitrary polygon.
    Polygon: the AREA OBJECT has an attribute that defines the NUMBER OF POINTS in the polygon (one single closed area, no crossing lines, no islands); In a separate table (AREA_SOURCE_POLYGONS) the coordinates are stored together with the OBJECT ID in a number indicating the drawing sequence:
                OBJ_ID n X Y
    the drawing routine finds N pairs of coordinates X,Y from n=1 to N and draws the polygon, closing it by connectin N with 1 again.
  • Data import: The area source geometry (polygon) can be imported as a CSV text file in a separate import dialog.
  • Source specific temporal scaling factors (for month, day, hour)
  • a TABLE of substance specific average (default) emission values (g/s);
  • optional one or more substance (or emission related parameter such as production volume, energy consumption, etc) specific temporal scaling factors;

Bulk Data Import:

To import a set of area sources together, the data from a spreadsheet can be impored directly to the data base, with parallel import of the corresponding polygon (geometry) data.

Polygon import:

An import function supports the import of polygon definition as shape files from ArcView.

The interactive polygon import dialog includes a browser option on the local client, and requires the specification of the features ID of the polygon boundaries in the shapefile imported.

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