Map plot (surfm) of polar regions missing data

Question

weirdkhar 2015-3-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/182181-map-plot-surfm-of-polar-regions-missing-data

评论： Chad Greene 2015-3-11

Hi all,

I have global model output and am trying to plot the data from a view above the south pole. I am using the surfm function (although using contourfm, or surfacem yields similar results) to plot the data on top of an axes such that:

 axesm('MapProjection','vperspec',...
                    'Frame','on','Grid','on',...
                    'Origin',[-90 0 0],...
                    'MeridianLabel','on','ParallelLabel','on')
 surfm(lat,lon,data)

where:

 lat = 145 x 1 double array (latitude of centre of grid box)
 lon = 192 x 1 double array (longitude of centre of grid box)
 data = 145 x 192 double array (model data)

The output of this results in a map, except that it contains a white 'wedge' at the edge of the dataset (see attached image). This doesn't occur when I plot the data in other plotting programs. Any ideas as to how to get it to plot the edge data and fill this wedge?

I have tried applying the example found at this link to my data, with the same result.

I assume it is a problem with my longitude array (since it is a longitudinal slice), but this is direct output from the model and as mentioned before, works fine with other plotting programs. My longitude array is of the following form:

lon = [0.9385, 0.9385+1.8750i, ..., 359.0625]

Any help would be greatly appreciated.

Thanks! weirdkhar

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Answer 1

Chad Greene 2015-3-10

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/182181-map-plot-surfm-of-polar-regions-missing-data#answer_170810

Hi Weirdkhar,

First, if you make a lot of maps centered about the South Pole, I recommend initializing with antmap or ncpolarm. It's a bit more streamlined than calling the axesm function with a bunch of arguments.

As for the missing data, a manual fix is to append your lat, lon, and data matrices with an extra column, which will be a copy of the very first column. That process is described here.