Plate Carree projection on GrADS Lat-Lon projected display

[Arief Sudradjat]

GrADS Users:

I read a Plate Carree preprojected map (already in lat & lon) and displayed it on GrADS Lat-Lon projection. Because the original map is a 1km grids global cover map, I used hires map background in displaying it on GrADS. It turns out that the displayed map does not really match the map background in detail (more like shifted 0.1 degrees E & S rather than not following). However, on a hemispheric view, the displayed map follow the map background.

Because I am not familiar with map projections, I am not sure if my problem is caused by the different projections used by the global map (Plate Carree) and GrADS display (lat-lon or spherical). I would really appreciate it if somebody is willing to address this problem.

Thanking you in advance,
Arief
CICS/ESSIC/UMD


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