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Shifted Grid

MIR can work with shifted grids, with no point at latitude=0, longitude=0. An example would be: 

No Format
AREA=89.5/0.5/-89.5/359.5,
GRID=1.0/1.0

This is done automatically provided the differences between N-S and E-W limits are both divisible by the corresponding increments without remainder. This represents a change in respect to EMOSLIB, which would adjust the area to fit. In the previous example, EMOSLIB would adjust the N/W/S/E boundaries to the more conventional area 90/0/-90/359.

In this example the black points represent the original grid with 1 degree spacing. The red points show the user defined area, which has the same spacing but shifted by half a degree.

MARS with EMOSLIB would expand the area to fit in the original grid, as seen in the yellow rectangle.

MARS with MIR would honor honour the user defined area and would return the inner grid shown in green.

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