Mapshow : attribute colors to polygons according to ID

Question

Loriann Chevalier 2022-8-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1785950-mapshow-attribute-colors-to-polygons-according-to-id

评论： Loriann Chevalier 2022-8-26

采纳的回答： Chad Greene

在 MATLAB Online 中打开

Hi everyone,

I have the map layer of climate zones downloaded from there : https://datacatalog.worldbank.org/search/dataset/0042325

I would like to display the different climate zones of Ethiopia, and represent each climate zone according to the climate type (GRIDCODE field in my shapefile's structure). I have this so far :

addpath('...')
climate = shaperead('c1976_2000.shp');
figure();
set(groot,'defaultLineMarkerSize',6);
mapshow(climate, "DefaultEdgeColor",[0.9 0.9 0.9])
xlim([32 49]);
ylim([2 16]);

The map displays fine and for my region of interest. However all the climate zones just appear in yellow. Obviously I would like to have them appear each in a different color according to their GRIDCODE ID but I can't do that and couldn't find anything on MathWorks either.

Thanks!

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Answer 1

Chad Greene 2022-8-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1785950-mapshow-attribute-colors-to-polygons-according-to-id#answer_1033780

在 MATLAB Online 中打开

Try this. Define a list of colors, and plot each gridcode region seperately.

climate = shaperead('c1976_2000.shp'); 
% List of grid codes: 
gc = [climate.GRIDCODE];
% What are the unique values of grid codes? 
ugc = unique(gc); 
% A color for each unique grid code: 
col = parula(length(ugc)); 
figure()
hold on
% Loop through each unique gridcode: 
for k = 1:length(ugc)
    % Plot only the shapes that whose grid code is ugc(k)
    mapshow(climate(gc==ugc(k)), "DefaultEdgeColor",[0.9 0.9 0.9],'facecolor',col(k,:))
end