Concentration Output Files

By default, ECHO-AIR will output a number of files related to the concentration calculations.

Concentration Map

A concentration map is generated labeled “[batch]_[run]_all emissions_concentrations.png”.

Concentration Shapefile

After each run, a file named “shapes” will be generated, containing shapefiles labeled as “batch_run_detailed_concentration” with the following extensions: “.cpg”, “.dbf”, “.prj”, “.shp”, and “.shx”. If the user enables the DETAILED_CONC option, then the concentrations output will contain speciated concentration data.

Each extension serves a specific purpose:

• .shp (Shapefile):
  • This file contains the spatial data’s geometry (points, lines, or polygons).
• .shx (Shape Index):
  • This file stores an index of the feature geometry for faster access.
• .dbf (dBASE Table):
  • This file is a database that stores attribute data associated with the shapes.
• .prj (Projection File):
  • This file holds information about the coordinate system and projection used.
• .cpg (Code Page File):
  • This file specifies the character encoding used in the attribute data.

These files collectively comprise a shapefile, storing both spatial and attribute data, and providing necessary information for spatial analysis and visualization.