Visualize population data in a coordinate grid

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Bas 2016-12-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/315831-visualize-population-data-in-a-coordinate-grid

评论： Star Strider 2016-12-8

Hi,

I'm struggling with the imagesc function to plot my population data.

I have a matrix A of 1500 x 3, in which the first column contains the decimal degree latitude value, the second column contains the decimal degree longitude value and the third column contains the population count at that specific coordinate set.

Now I would like to make the population visible in a plot with the x-axis showing the longitude and the y-axis the latitude coordinate.

Matrix A looks like this:

A= [51.5416665650000  -0.650000374000000  236;
51.5416665650000  -0.641667041000000  519;
51.5416665650000  -0.633333708000000  1857............]

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Answer 1

Star Strider 2016-12-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/315831-visualize-population-data-in-a-coordinate-grid#answer_246322

在 MATLAB Online 中打开

See if this does what you want:

A= [51.5416665650000  -0.650000374000000  236;
51.5416665650000  -0.641667041000000  519;
51.5416665650000  -0.633333708000000  1857];
figure(1)
scatter3(A(:,1), A(:,2), A(:,3))
grid on
figure(2)
stem3(A(:,1), A(:,2), A(:,3))
grid on

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Bas 2016-12-8

What I'm looking for is a 2D plot with on the x-axis the longitude coordinate, on the y-axis the latitude coordinate and the grid itself showing the population by means of a colorbar (darker color, a higher population density).

So the grid should be minimum longitude and latitude coordinate in the origin and the maximum longitude and latitude coordinate in the northeast corner.

Star Strider 2016-12-8

在 MATLAB Online 中打开

Experiment with the image function and its friends:

figure(3)
image(A(:,1), A(:,2), A(:,3))

Note that the related pcolor function will delete one row and one column, because of the way it defines its plots. I do not recommend it for what you want to do.

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