Quiver Plot over Binary map

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Yogang
Yogang 2022-6-14
评论： KALYAN ACHARJYA 2022-6-18
Ran in:
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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回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2022-6-14
编辑：KALYAN ACHARJYA 2022-6-14
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.
  2 个评论
Yogang
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.
KALYAN ACHARJYA
KALYAN ACHARJYA 2022-6-18
Can it be done segmentation in particular water area only (after quiver plot)? Is that OK?

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