6.4. Spatial Allocation Files

6.4.1. SRGDESC: Surrogate Designation, Description and Surrogate profile filename.
6.4.2. Area and Mobile Spatial Surrogates Files
6.4.3. AGREF and MGREF: Gridding cross-reference files for area and mobile sources
6.4.4. BELD3_A, BELD3_B, BELD3_TOT: BELD3 land use data files
6.4.5. BELD6 and BIOMASS: BELD land use data files
6.4.6. BGPRO: Biogenic spatial surrogate file
6.4.7. GRIDDESC: Grids and projection information

All 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 directories where the spatial allocation files should be stored are listed in Table 6.3, “Spatial Allocation Input File Locations”. The table also lists the programs that use each input file.

6.4.1. SRGDESC: Surrogate Designation, Description and Surrogate profile filename.

The Surrogate Description file is used to designate the regional location of the surrogate, the surrogate code number, a brief description of the code number and the Area and Mobile spatial surrogate file in which surrogate profile can be found. This file is located in SRGPRO_PATH. See Figure 4.4, “Grdmat input and output files”. The format of the SRGDESC file is shown in Table 6.37, “Format for SRGDESC.

Table 6.37. Format for SRGDESC

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:

  • Latitude-Longitude: “LAT-LON” or “LATGRD3
  • Lambert Conformal: “LAMBERT” or “LAMGRD3
  • Polar Stereographic: “POLAR” or “POLGRD3
  • UTM: “UTM” or “UTMGRD3
  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 Region of surrogate i.e. USA, MEX, or CAN. (ASCII) (not used by SMOKE)
  B Surrogate code number (Integer)(required)
  C Surrogate Description (ASCII 80 characters in quotes) (required)
  D Surrogate file name (ASCII 80 characters) (required) located in SRGPRO_PATH