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- Northern latitudes (north of the equator) must be given as positive numbers
- Southern latitudes (south of the equator) must be given as negative numbers
- Eastern longitudes (east of the 0 degree meridian) must be given as positive numbers
- Western longitudes (east of the 0 degree meridian) must be given as negative numbers
If the longitude values overlap, e.g. 0 and 360 or -180 and 180, the eastern line of points will not be returned.
| value | comment |
|---|---|
North/West/South/East | latitude/longitude coordinates of sub-area |
E | specifies the European area 73.5/-27/33/45 |
G | specifies the global area 90/0/-90/360 (default) |
If the longitude values overlap, the most eastern line of points will not be returned, e.g.
AREA=90/-180/-90/180, |
|---|
will return a field with the boundaries 90/-180/-90/179.5.
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In cases where the differences between N-S and E-W limits are not divisible by the corresponding increments without remainder, MARS starts from the user-specified south-west corner and goes up to (but does not exceed) the north-east corner. For example, a request specifying:
AREA=55.5/0.5/45.0/5.0, |
|---|
retrieves AREA=55.0/0.5/45.0/4.5 with the northern and eastern boundaries adjusted so that the area returned lies within that specified by the request and includes a point at latitude=0, longitude=0.
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