www.gusucode.com > map 案例源码 matlab代码程序 > map/InspectAnExampleOfVectorMapDataExample.m
%% Inspect an Example of Vector Map Data % This example shows how to display vector map data and examine vector data % values. %% % Load vector data set MAT-file of world coastlines and look at the % variables created in the workspace. The variables |coastlat| and % |coastlon| are vectors which together form a vector map of the coastlines % of the world. % Copyright 2015 The MathWorks, Inc. load coastlines whos %% % View a map of this vector data. The example presents the map using a % Mercator projection. A map projection displays the surface of a sphere % (or a spheroid) in a two-dimensional plane. Points on the sphere are % geometrically projected to a plane surface. There are many possible ways % to project a map, all of which introduce various types of distortions. axesm mercator framem plotm(coastlat,coastlon) %% % Inspect the first 20 coordinate values of the coastline vector data set. [coastlat(1:20) coastlon(1:20)] %% % To see where these coastline vector points fall on the map, plot them in % red. As you might have deduced by looking at the first column of the % data, there is only one continent that lies below -80 latitude: % Antarctica. plotm(coastlat(1:20), coastlon(1:20),'r')