How to decide these geogrid parameters in nameslist.wps ?

[winash12]

How can I get a starting value for i_parent_start and j_parent_start ?


Also dx and dy ? Is ref_lat and ref_lon the lowest left corner of my outer most grid ?

Also is the projection for me - mercator ? I am wanting a domain between 35 N and the equator.

 

[Ming Chen]

Please see answers below:

How can I get a starting value for i_parent_start and j_parent_start ?

These two variables are used to specify the starting points of the child domain for nesting run. They are lower-left corner starting indices of the nest domain in its parent domain

Also dx and dy ? Is ref_lat and ref_lon the lowest left corner of my outer most grid ?

dx and dy are the grid interval of WRF. ref_lat and ref_lon are lat and lon of the central point of WRF. Please see more detains at
Chapter 3: WRF Standard Initialization

Also is the projection for me - mercator ? I am wanting a domain between 35 N and the equator.

I suppose mercator should work for your case.