### Equation for calculating e_we, e_sn, i_parent_start, j_paren

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**Mon Sep 21, 2015 7:24 am**Hi,

Is there any equation for calculating e_we, e_sn, i_parent_start, j_parent_start to write a automatic program by using resolution, corner boundary values and central latitude and longitude for parent and nests for any projection for any location in the globe for WRF_ARW.

I tried to understand the WPS code, but i unable to get the clear picture.

Please share your views.

Thanks & Regards,

Is there any equation for calculating e_we, e_sn, i_parent_start, j_parent_start to write a automatic program by using resolution, corner boundary values and central latitude and longitude for parent and nests for any projection for any location in the globe for WRF_ARW.

I tried to understand the WPS code, but i unable to get the clear picture.

Please share your views.

Thanks & Regards,