VIC Domain file¶
The Image Driver uses the NetCDF file format to define model running domain.
Below is a list of variables in the domain netCDF file. The dimensions of the netCDF file are lat
and lon
. Note that here only the type of variables (i.e., MASK, AREA, FRAC, LAT and LON) is listed; corresponding variable names in the input netCDF file are specified by user in the Global Parameter File. All the listed variables are required.
Variable | Dimension | Units | Type | Description |
---|---|---|---|---|
LAT | [lat] | degree | double | Latitudes |
LON | [lon] | degree | double | Longitues |
MASK | [lat, lon] | N/A | integer | Mask of domain. 1 for grid cells inside considered domain; 0 for grid cells outside of domain. Cells outside of domain will not be run. Use run_cell variable in the parameter file to turn on/off active cells inside domain. |
AREA | [lat, lon] | m2 | double | Area of grid cells. |
FRAC | [lat, lon] | N/A | double | Fraction of grid cells that is land. |
Example netCDF format VIC 5 image driver domain file¶
ncdump -h /ArkRed.domain.nc
netcdf ArkRed.domain {
dimensions:
lat = 66 ;
lon = 125 ;
variables:
int mask(lat, lon) ;
mask:comment = "0 indicates grid cell outside of domain" ;
mask:long_name = "domain mask" ;
double lon(lon) ;
lon:long_name = "longitude coordinate" ;
lon:units = "degrees_east" ;
double lat(lat) ;
lat:long_name = "latitude coordinate" ;
lat:units = "degrees_north" ;
double frac(lat, lon) ;
frac:long_name = "fraction of grid cell that is active" ;
frac:units = "1" ;
double area(lat, lon) ;
area:standard_name = "area" ;
area:long_name = "area of grid cell" ;
area:units = "m2" ;
// global attributes:
:title = "VIC domain data" ;
:Conventions = "CF-1.6" ;
:history = "Wed Oct 12 15:48:42 2016: ncap2 -s mask=int(mask) ArkRed.domain.nc.float_mask ArkRed.domain.nc\n",
"created by ymao, 2016-09-23 18:17:58.761256" ;
:user_comment = "VIC domain data" ;
:source = "generated from VIC CONUS 1.8 deg model parameters, see Maurer et al. (2002) for more information" ;
:nco_openmp_thread_number = 1 ;
}