Release Level	5.3.0 beta
Release Date	2007 06
Revision Level	1.1

Model Domain Object

Domains are OBJECTS that can be selected from the OBJECT DATA BASE hierarchical selection/navigator tools.

A domain usually will cover a specific area of interest such as a city, industrial district, part of the transportation system, the area around a major emission source like a thermal power station or major industry, or the entire region of an application. The domain definition provides a shared data structure to ensure the consistency between

1. all the georeferenced data such as the emission sources,
2. a meteorological scenario,
3. model grid and sub-grids and thus georeferenced output,
4. results post-processing such as exposure analysis.

A Domain is a named object with the standard object MEATA DATA header.

Due its multiple use by different models, scenarios, and also as embedded grid in CAMx, domains are READ ONLY and can only be modified by ADMIN group user. The attributes of a domain include:

1. Object META DATA including name and description;
2. Symbolic georeference (data driven set of administrative or geographical concepts such as region, province, community)
3. Location and (rectangular) extent, defined by:
   • Reference point X and Y (in the center of the domain) used to locate the domain; this is shown as the usual default OBJECT location indicator as a circle on the map, it can edited by ADMIN users, also used to locate the object on the map interactively;
   • Origin X and Y: map coordinates of the origin (lower left corner) of the domain, computed from reference and extent, read only;
   • Aspect ratio (symbolic selection between square 1:1 and landscape 4:3);
   • East-West extent or width in km
   • North-South extent in km (computed, read only)
   • area covered (in km², computed, read only)
   • the upper right corner is computed and stored/accessible in the data base, but not displayed.
   • Map margin (in % of the domain extent, generates a margin around the domain rectangle).
4. Background map: MAP ID for the background map (hidden), the map can be selected interactively through the MapCatalog.

For a new domain, the ADMIN user can specify:

• name and description;
• select the aspect ratio and horizontal extent;
• select the map window size in % of the domain width;
• define the location of the reference point i(center of the domain);
• select an alternative background map from the MapCatalog;

Nested grid constraints

1. The domain must be square;
2. The corner point must be positioned on a 3km master grid node;
3. The domain size (extent) must be modulo 3.
4. The extent must not exceed 24 km.

Development Notes

• Elevation distribution and area/elevation diagram;
• Land use distribution and pie chart of CORINE level 1 classification;
• Population distribution (total, age/sex distributiuon derived from census data, gridded spatial distribution);

  

• Emissison sources (total N and link to the sources in the domain, i.e., the domain specific emission inventory); please note that a domain specific emission inventory can be generated dyanmically by
  1. select a domain from the OBJECT CLASS Emission inventory selection; asny newly defined domain will be automatically included in that list;
  2. press the RECALCULATE button to calculate the doamin specifc emission data;
• Monitoring stations within the domain.
• Receptor Areas and Receptor Points (building points).