Quiver Plot over Binary map

Question

Yogang 2022-6-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1740415-quiver-plot-over-binary-map

评论： KALYAN ACHARJYA 2022-6-18

I have a binary image of the coastline and would like to plot quiver (representative of wind) on the top of the binary map. The issue I am having is:

(1) How to plot vectors on the water area by extracting the features between land and water?

(2) How to finally get a combined image comprising of vector and binary data?

My current code is here:

im = imread('Genova_Binary.tif');
Error using imread>get_full_filename
File "Genova_Binary.tif" does not exist.

Error in imread (line 371)
    fullname = get_full_filename(filename);
[x,y] = meshgrid(-2:.2:2,-1:.15:1);
z = x .* exp(-x.^2 - y.^2); [px,py] = gradient(z,.2,.15);
quiver(x,y,px,py); axis image %plot the quiver to see the dimensions of the plot
hax = gca; %get the axis handle
image(hax.XLim,hax.YLim,im); %plot the image within the axis limits
hold on; %enable plotting overwrite
quiver(x,y,px,py) %plot the quiver on top of the image (same axis limits)

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Answer 1

KALYAN ACHARJYA 2022-6-14

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1740415-quiver-plot-over-binary-map#answer_985660

编辑：KALYAN ACHARJYA 2022-6-14

在 MATLAB Online 中打开

im = imread('Genova_Binary.tif');
[x,y] = meshgrid(-2:.2:2,-1:.15:1);
z = x .* exp(-x.^2 - y.^2); [px,py] = gradient(z,.2,.15);
quiver(x,y,px,py); axis image %plot the quiver to see the dimensions of the plot
hax = gca; %get the axis handle
image(hax.XLim,hax.YLim,im); %plot the image within the axis limits
hold on; %enable plotting overwrite
quiver(x,y,px,py) %plot the quiver on top of the image (same axis limits)

Please ensure "Genova_Binary.tif" must be in currunt working directory.

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Yogang 2022-6-14

I am already having the working code here for the above plot but my question is :

(1) How to plot vectors on the water area by extracting the features between land and water? So I just want the vectors over water area not over land.