Area calculation within contour

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William White 2018-2-6

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回答： William White 2018-2-7

采纳的回答： William White

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Sirs, I have the following plot

[C,h] = contour(X,Y,Z,[s,s])

Where s is a variable that I change. This plot the image:

I am interested to calculate the area inside this contour (so I can compare different values of s)

I have attempted to use some previous solutions I have found on this site, to no joy.

I have attached data for X,Y,Z

s can take any value <Z max

kind regards. W

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Image Analyst 2018-2-6

Someone could if you had given us the data to create your plot. Come on, make it easy for people to help you not hard.

Steven Lord 2018-2-6

You should give a small sample data set that's more or less representative of your actual problem. That way interested people can test out their suggestions ahead of time to make sure they work.

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William White 2018-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/381103-area-calculation-within-contour#answer_303792

I think I have a rather clumsy numeric answer.

I count the number of entries in Z that are equal or larger than s.

Then multiply by the area of a unit "pixel" (because I know the dimensions of X,Y I know how many "pixels" are in X,Y and so the area of that pixel).

Thanks for everybody's help W

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