Using interp2 on maps that have different longitude systems

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Melissa
Melissa 2015-5-15
评论： Melissa 2015-5-16
Hello,
I am trying to use interp2 between A and B
A longitude spans 0 to 360
B longitude spans -180 to 180
If I use wrapTo180 on A, it is no longer monotonically increasing.
If I use wrapTo360 on B, it is no longer monotonically increasing.
If I use interp2 without wrapping either, I only get the interpolated data for longitudes 0+
What are my options for getting a full global interpolation with these different longitude systems?
Thank you,
Melissa

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Walter Roberson
Walter Roberson 2015-5-15
unwrap one of them and circshift as needed to make it and the referenced data monotonically increasing.
Blongwrap = wrapTo360(Blong);
crossingidx = find(diff(Blongwrap) < 0, 1);
Blongwrapshifted = circshift(Blongwrap(:),-crossgidx,1);
Bshifted = circshift(B, -crossingidx, 1);
This assumes that, as per your previous postings, longitude varies in the first dimension.
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Melissa
Melissa 2015-5-16
Thank you so much! Sorry, I didn't see your comments from the other posts because it doesn't notify me :(

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