When i run CMAQ version 5.3.2 successfully, but encounter an error when running version 5.4.
As shown in the figure.
The units for the coordinate system are meters, and it seems most exceedingly improbable that the SW corner of your grid is just over half a kilometer south of the map-projection center. This is most probably a “bad” file – where did it come from?
On the other hand, these two values are certainly within the bounds of reasonable round-off error of being the same thing – the newer version of CMAQ may well be using a bad round-off check. Why they didn’t use the I/O API’s carefully ropundoff-tuned coordinate-checking routine
GRDCHK3 is beyond me.