# define the range of Longitude from 0-360 in the World plot from CountryData

How can I change the Longitude range to 0-360 in the such plots?

Graphics[{GrayLevel[0.2],AbsoluteThickness[1.5],
CountryData[
"World", {"SchematicPolygon",{"Equirectangular",{0,180}}}
]/.Polygon->Line},
Frame->True,ImageSize->200]


Thanks

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I don't think longitude goes above +/- 180, though... – cormullion Jan 21 '13 at 12:18
@cormullion Among many examples of longitude extending beyond the $[-180,180]$ range, NASA's recent Cassini mission mapped Titan between 0 and 360 degrees longitude. In principle there's no limit to longitude; for instance, to describe a spiraling track around the earth, one might prefer to use as many multiples of 360 degrees as there are windings of the spiral (in order to maintain a local continuity of the longitude coordinate). – whuber Jan 21 '13 at 17:14
@whuber well, I learn something every day! – cormullion Jan 21 '13 at 17:18
It is common to use longitude between 0 and 360 in climate science (although 180W-180E is more common). In Mathematica, the command Longitude is also defined between -180 and 360. – Karami Jan 22 '13 at 9:08

Simply like this:

map = Graphics[{GrayLevel[0.2], AbsoluteThickness[1.5],
CountryData[
"World", {"SchematicPolygon", {"Equirectangular", {0,
180}}}] /. Polygon -> Line}, Frame -> True];

Show[map,
FrameTicks -> {{Automatic,
None}, {Transpose[{Range[13]*30 - 210, Range[13]*30 - 30}],
None}}, ImageSize -> 400]


Show[map,
FrameTicks -> {{Automatic,
None}, {Transpose[{Range[13]*30 - 210,
RotateLeft[Range[13]*30 - 30, 7] /. x_ /; x > 180 :> x - 30}],
None}}, ImageSize -> 400]


map = Graphics[{GrayLevel[0.2], AbsoluteThickness[1.5],
CountryData[
"World", {"SchematicPolygon", {"Equirectangular", {0,
180}}}] /. Polygon -> Line}, Frame -> True];

linepos = First[Position[map, Line]];
line = Extract[map, Most[linepos]];
newline = line /. {a_Real, b_} :> {a + 180, b};
map2 = ReplacePart[map, Most[linepos] -> newline];

p2 = ListContourPlot[
Table[Sin[i + j^2], {i, 0, 3, 0.1}, {j, 0, 3, 0.1}],
Contours -> 15, ColorFunction -> "Rainbow", AspectRatio -> 1/2,
DataRange -> {{0, 360}, {-90, 90}}];

Show[p2, map2, ImageSize -> 400]


-
Thanks a lot. It was a great help. – Karami Jan 21 '13 at 13:16
Now I face with another problem.When I try the following, I do not get the two plots on each other with the newly defined range for longitude.For example: p2 = ListContourPlot[ Table[Sin[i + j^2], {i, 0, 3, 0.1}, {j, 0, 3, 0.1}], Contours -> 15, ColorFunction -> "Rainbow", AspectRatio -> 1/2, DataRange -> {{0, 360}, {-90, 90}}] ; Show[p1, map, ImageSize -> 400, FrameTicks -> {{Automatic, None}, {Transpose[{Range[13]*30 - 210, Range[13]*30 - 30}], None}}, ImageSize -> 400] – Karami Jan 21 '13 at 13:25
many thanks again – Karami Jan 21 '13 at 14:02