Hi,
It appears that one needs to "double up" the beginning and ending
longitude values when displaying a 2-D lat/lon grid. For example, say
we have a complete 2-D regular lat/long grid of data values on 10 degree
centers. Then, in order to display it via the following code (for
example):
display.addMap(new ScalarMap((RealType)domainType.getComponent(0),
Display.Longitude));
display.addMap(new ScalarMap((RealType)domainType.getComponent(1),
Display.Latitude));
the grid must have the following latitude locations:
-90, -80, -70, -60, -50, -40, -30, -20, -10, 0, 10, 20, 30, 40, 50,
60, 70, 80, 90
and the following longitude locations:
0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150,
160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280,
290, 300, 310, 320, 330, 340, 350, 360
Note that the values at 0 degrees longitude must be replicated at 360
degrees longitude. If this is not done, then the field is displayed
with a 0th-order discontinuity at 0 degrees longitude.
Is this true? And, if so, why and is there a workaround?
--Steve
