AGPRO
and MGPRO
: Area and Mobile Spatial Surrogates FilesAGREF
and MGREF
: Gridding cross-reference files for area and mobile sourcesBELD3_A
, BELD3_B
, BELD3_TOT
: BELD3 land use data filesBGPRO
: Biogenic spatial surrogate fileGRIDDESC
: Grids and projection informationAll spatial allocation (gridding) inputs need to be consistent. Each file has a header to indicate the grid projection, location, dimensions, and resolution; SMOKE uses these headers to ensure consistency across all inputs. SMOKE also requires that any meteorology data inputs be consistent with these gridded data. Most programs in SMOKE are capable of processing a modeling grid that is a subgrid of the input data (i.e. spatial surrogates, meteorology data).
Several options are available for creating the spatial surrogate and biogenic land use inputs.
The MIMS Spatial Allocator can create surrogates and prepare BELD3 inputs files for any modeling grid.
Several national surrogate data sets are available online at EPA’s Clearinghouse for Inventories and Emissions Factors. These data sets are at 36-, 12-, and 4-km resolutions.
The gridding surrogates and land use data can be prepared using a GIS program.
The directories where the spatial allocation files should be stored are listed in Table 8.3, “Spatial Allocation Input File Locations”. The table also lists the programs that use each input file.
The spatial surrogates files contain the spatial allocation factors for all area sources and non-link mobile sources. One
file may be used for both area and mobile sources, although the SMOKE programs use the two logical file names to access it.
The format for these files is shown in Table 8.57, “Format for AGPRO
and MGPRO
”.
Table 8.57. Format for AGPRO
and MGPRO
Line | Position | Description |
---|---|---|
1 | A | #GRID |
B | Grid name | |
C | X origin in units of the projection | |
D | Y origin in units of the projection | |
E | X direction cell length in units of the projection | |
F | Y direction cell length in units of the projection | |
G | Number of columns | |
H | Number of rows | |
I | Number of boundary cells | |
J |
Projection types:
|
|
K | Projection units | |
L | Projection alpha value | |
M | Projection beta value | |
N | Projection gamma value | |
O | X-direction projection center in units of the projection | |
P | Y-direction projection center in units of the projection | |
2+ | A | Spatial surrogates code (area) or county feature/roadway type (mobile) (Integer) (required) |
B | Country/state/county code (6-digit Integer YSSCCC) (required) | |
C | Grid column number (Integer) (required) | |
D | Grid row number (Integer) (required) | |
E | Spatial surrogate ratio (area) or fraction of county feature in cell (mobile) (Real) (required) |