I have a raster set to 0-360E projected using WGS:1984.

When I modify the Data Frame Properties GCSWGS1984 to a custom meridian of 180, the raster does not move. The polygon of the continent moved but not the raster.

Also, I want the raster to display at 160. Because at 0-360, UK (of course) is cut lengthwise. So I want it at 160.

I am using ArcMap 10.3.

  • Does this help gis.stackexchange.com/questions/37790/… – Michael Stimson Dec 3 '18 at 5:44
  • 1
    You asked a near-identical and since Roomba-ed question about 6 weeks as gis.stackexchange.com/questions/299992/… I think the comment offered there by @Vince of "Copy, Shift, Mosaic, Clip." is still the way to do this. – PolyGeo Dec 3 '18 at 5:53
  • Thanks, @PolyGeo. I totally forgot the thread. But I am confused how to do the Copy, Shift, Mosaic, Clip? – user2543 Dec 3 '18 at 6:34
  • If you modified the WGS84 geographic coordinate system to give it a new prime meridian of 180 or 160, you also need to set a custom transformation for it so give it a custom name as well. Alternative: use a projected coordinate system with the central meridian set to 160. – mkennedy Dec 3 '18 at 17:51
  • Hi, MKennedy: I will try this tonight. – user2543 Dec 4 '18 at 9:56

To do this in ArcMap.

  1. Use the shift tool to your chosen central meridian. Make sure that you modify your data frame coordinate system to your similar central meridian.
  2. Clip. Return to original coordinate system. I used WGS 84, in this case. Clip the raster to the area uncovered by the shifting. This becomes tricky. You need to be exact in clipping extent as it will have impact on your seamlines.
  3. Mosaic. Mosaicc using the shifted raster as mosaic operator.

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