I'm struggling to plot data over dateline when centred on the North Pacific using geoscatter.

Question

Clare Ostle 2023-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/1975499-i-m-struggling-to-plot-data-over-dateline-when-centred-on-the-north-pacific-using-geoscatter

评论： Clare Ostle 2023-6-8

example.mat

Below is some example data and code. I am wanting to use geoscatter to plot the data across the North Pacific, however it cuts off the data at the dateline (180W Figure 2) due to the way the figure is centered. Geobubble does not cut the data off in the same way and centers the plot around the data (the North Pacific see figure 1). How can I achieve this same behaviour seen in Geobubble (figure 1) in Geoscatter (figure 2)? Thanks for any help!

load example.mat

latlim = [30 75];

lonlim = [130 -115];

centre_lat=54.412;

centre_lon=-173.603;

figure

geobubble(tow_data(:,1),tow_data(:,2),tow_data(:,3));%HOW COME GEOBUBBLE ZOOMS IN BEAUTIFULLY??? Figure 1:

figure

geoscatter(tow_data(:,1),tow_data(:,2),50,tow_data(:,3),'filled');%GEOSCATTER doesn't do well going over -180 line : (

geolimits(latlim,lonlim);

colorbar %Figure 2:

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Answer 1

Kevin Holly 2023-6-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1975499-i-m-struggling-to-plot-data-over-dateline-when-centred-on-the-north-pacific-using-geoscatter#answer_1252184

编辑：Kevin Holly 2023-6-7

在 MATLAB Online 中打开

example.mat

load example.mat

As you can see below, the data points are far apart.

figure

geoscatter(tow_data(:,1),tow_data(:,2),50,tow_data(:,3),'filled');

I added 360 degrees to all the datapoints that were negative.

figure

tow_data(tow_data(:,2)<0,2)=tow_data(tow_data(:,2)<0,2)+360;

geoscatter(tow_data(:,1),tow_data(:,2),50,tow_data(:,3),'filled');

colorbar

Alternatively, you could subtract 360 degrees from all of the longitudinal coordinates greater than zero.

figure

tow_data(tow_data(:,2)>0,2)=tow_data(tow_data(:,2)>0,2)-360;

geoscatter(tow_data(:,1),tow_data(:,2),50,tow_data(:,3),'filled');

colorbar

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Clare Ostle 2023-6-8

Thank you that is a useful workaround and helpful. I am still curious that the behaviour of geobubble seems to re-organise the data in the way that you have suggested, whereas geoscatter does not. Do you know why this might be?

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