Re: defining all corners of a map region

Hi Dave,
You should be able to use the "Points" mode, but in order to get it to work, you have to set the projection and the center lat and lon correctly.
As you might imagine, these points are only at the corners of a rectangle for a precisely defined set of projection parameters, and if the points are not correct, there may be no possible
projection parameters that could make them into rectangular corners.
 -dave

On Mar 13, 2014, at 10:05 AM, "David B. Reusch" <dreusch@ees.nmt.edu> wrote:

> Hello,
>
> I am trying to make a map of a region with a rectangular shape (equal
> length sides, equal length top/bottom) in polar latitudes. I would like
> to define the region by the lat/lon of all four corners, not just edges
> or upper left/lower right. I thought mpLimitMode = "Points" was
> promising, but it's not clear from the docs that my corners can be used
> as the left/right/top/bottom points and I'd get the rectangle I'm seeking.
>
> Using other tools, I've figured out the four corners I need, from lower
> left, clockwise:
> 75S, 135W
> 72.5S, 134.7W
> 72.16S, 117W
> 74.6S, 115W
> I realize this is more like a trapezoid in lat/lon but if I use a
> rectangle in lat/lon, the top and bottom edges are different lengths
> (the joys of the higher latitudes!).
>
> Is there any way to do this in NCL?
>
> I've been using a trial&error approach and option LatLon for some years
> now but was hoping there might be an alternative.
>
> Thanks,
> Dave
>
> --
> Associate Research Professor of Climatology
> Dept of Earth and Environmental Science
> MSEC 304; 801 Leroy Pl
> New Mexico Tech
> Socorro, NM 87801
>
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Received on Thu Mar 13 11:02:33 2014