I am currently trying to validate my CROCO model output with some CTD observation data which is at some fixed longitude and latitude points. For this I need model output data say salinity at this same or nearest lat_rho and lon_rho as for CTD data.

I tried to find the corresponding index from lat_rho and lon_rho but due to staggered grid I am facing difficulties to get it correctly. Can any one pleasse help to to overcome with this problem??