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points lying inside a polygon and a circle

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KalMandy
KalMandy 2017-1-30
编辑： Matt J 2019-4-25
How can I find the number of point lies inside both a circle and a polygon (the point should lie in the mutual/overlapping area in between the circle and the polygon) ?

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Matt J
Matt J 2017-1-30
编辑：Matt J 2019-4-25
If the circle is centered at (x0,y0), with radius R and the polygon has vertices xv,yv, you could do,
count = sum( inpolygon(x,y,xv,yv) & ((x-x0).^2+(y-y0).^2<=R^2) )

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Image Analyst
Image Analyst 2017-1-30
Did you try
count = 0;
if inpolygon(x,y,xCircle,yCircle) && inpolygon(x,y,xPoly,yPoly)
count = count + 1
end
where you call inpolygon twice, once passing in the circle coordinates and once passing in the polygon coordinates and then ANDing the two results together?
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KalMandy
KalMandy 2017-1-30
I have the radius and the coordinates of the center of the circle. what is given by xCircle,yCircle? Thanks for your response.
hanif hamden
hanif hamden 2019-4-25
If i put (x,y) in geographical coordinate and I want my radius is 10km. How should I do that?

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