How to filter out x-y coordinates and data from a plot, covering exactly the boundary of some region?

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Aditya Wahi
Aditya Wahi 2017-7-11
编辑： Aditya Wahi 2017-7-21
I want to extract the data that belongs exactly to within a particular boundary, but I don't know how to go about it.
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KSSV
KSSV 2017-7-11
If your small region data falls beyond the main region data, then you can do extrapolation but this is not suggested. Why don't you show your domains pictorially so that we can get clear idea.

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Chad Greene
Chad Greene 2017-7-16
To find points in a polygon use inpolygon, just as I suggested in the other post. If you're using Mouginot's annual velocity dataset, the coordinates are
x = -2800000:1000:2800000;
y = (2800000:-1000:-2800000)';
and when you plot it you can use
imagesc(x,y,V)
axis xy image
To find the pixels corresponding to Amery, get a grid of x,y points like this:
[X,Y] = mesghrid(x,y);
Then use inpolygon following the example I wrote for Wilkins Ice Shelf here.
Since you're using the Measures annual data, are you aware of the measuresann_interp function?

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KSSV
KSSV 2017-7-11
You can get the points lying inside the closed region using inpolygon. Read about inpolygon.
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Aditya Wahi
Aditya Wahi 2017-7-12
Sir, I tried using the code that you gave me, but rgb2gray command is giving me the following error:-
Error using rgb2gray>parse_inputs (line 82)
MAP must be a m x 3 array.
Error in rgb2gray (line 37)
X = parse_inputs(X);
What can I do about this?

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