MapWindow 4 - Desktop Application : MapWindow Discussion Forum
I have been trying to create a map of the world with overlays that is "unwrapped" in the middle of the Atlantic Ocean (longitude 25W) instead of the middle of the Pacific. Using the NOAA's 5' Global Image (http://www.ngdc.noaa.gov/mgg/topo/globegal.html) I have been able to
Unwrapping Cylindrical Projections at Longitude other than 180 degrees
Posted by:
John Moon ()
Date: November 28, 2010 01:04AM
I have been trying to create a map of the world with overlays that is "unwrapped" in the middle of the Atlantic Ocean (longitude 25W) instead of the middle of the Pacific.
Using the NOAA's 5' Global Image (http://www.ngdc.noaa.gov/mgg/topo/globegal.html) I have been able to do this by editing the image in Photoshop then georeferencing the raster (adding 360 degrees to longitude of the "tile" from 25W to 180W).
As expected, when I added the layers (from the MW World sample) they were OK for 25W through 0 to 180E but the layer for 25W to 180W was still "out to the left".
Much appreciated if anybody could point me in the direction of finding out how to "shift the layers" for 25W to 180W so that they overlay the raster file for 25 W to 180W.
Using the NOAA's 5' Global Image (http://www.ngdc.noaa.gov/mgg/topo/globegal.html) I have been able to do this by editing the image in Photoshop then georeferencing the raster (adding 360 degrees to longitude of the "tile" from 25W to 180W).
As expected, when I added the layers (from the MW World sample) they were OK for 25W through 0 to 180E but the layer for 25W to 180W was still "out to the left".
Much appreciated if anybody could point me in the direction of finding out how to "shift the layers" for 25W to 180W so that they overlay the raster file for 25 W to 180W.
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