How to shift a map, so that the Pacific Ocean will be in the center?

Question

Leon 2015-4-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/213629-how-to-shift-a-map-so-that-the-pacific-ocean-will-be-in-the-center

评论： Leon 2015-4-29

采纳的回答： Philip Caplan

I'm using the below commands to plot a global map.

S1 = shaperead('map/ne_110m_land.shp');

mapshow(S1);

How do I shift the map slightly, so that the Pacific Ocean will be displayed in one piece? When I used plot(x,y, 'k.') to do the plot, I can simply use x(x<20)=x(x<20)+360 to deal with it. How should I do it in mapshow?

Thank you.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Philip Caplan 2015-4-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/213629-how-to-shift-a-map-so-that-the-pacific-ocean-will-be-in-the-center#answer_176862

在 MATLAB Online 中打开

Here is an example of how to shift the x-coordinates of all the geometries stored in the 'concord_roads.shp':

S1 = shaperead('concord_roads.shp');
S2 = S1;
for i=1:length(S2)
  S2(i).X = S2(i).X +1e5; % replace appropriate shift here
end
figure(1); mapshow(S1);
figure(2); mapshow(S2);

You will notice that the x-coordinates in Figure 2 are all shifted by 1e5.

You may not need to apply this shift to all the geometries stored in the structure returned by shaperead so you may only need to apply this shift to a certain subset of the geometries describing the Pacific Ocean.