Modify the area specified by a shapefile

WRFtailor can modify the WRF input data (grid points) inside the area of a shapefile, by providing the desired variable to be modified and a polynomial to replace the values of the desired variable.

All required settings can be managed by a text file (namelist.wrf).

Note

The shapefile can partly cover the domains. For example, it is okay if the shapefile be entirely inside the parent domain, but covers half of the subdomain.

Example

Modify WPS geographical data (geo_em.d01.nc and geo_em.d02.nc):

Provide the paths to the files in namelist.tailor:

====================== WRF files and input data =======================

===================================================================

number_of_domains = 2

domain_1 = /home/anikfal/extra_codes/SR/emissions/wrfchemi/geo_em.d01.nc

domain_2 = /home/anikfal/extra_codes/SR/emissions/wrfchemi/geo_em.d02.nc

domain_3 =

domain_4 =

domain_5 =

————————————————————————————————-

Set namelist.tailor to modify the values of the desired variables:

====================== Modify by shapefile mask =======================

===================================================================

shapefile_ON_OFF = 1

target_variable1 = LANDUSEF

target_var_level1 = 12

substitute_variable1 = (ALBEDO12M * 1.1) + EROD + GREENFRAC + 1.2

substitute_var_levels1 = 1,1,6

path_to_shapefile = /home/anikfal/extra_codes/tehranbasin.shp

inverse_mask_on_off = 0

————————————————————————————————-

In the table above, the variable LANDUSEF in the area inside the shapefile tehranbasin.shp will be modified and replaced by (ALBEDO12M * 1.1) + EROD + GREENFRAC + 1.2. substitute_var_levels1 specifies the levels for ALBEDO12M, EROD, and GREENFRAC, respectively. Levels for each of these variable may be a special dimension (month, soil layer, etc).

Shapefile area to be used for modifying the LANDUSEF variable:

Shapefile border

Parent domain and nested domains for the WRF input data (geo_em):

WRF domain structure

Nested domain will be tailored as shown below:

Variable LANDUSEF, modified by WRFtailor

Parent domain will be tailored as shown below:

Variable LANDUSEF, modified by WRFtailor