separate rain events by specific dry period

Question

Albert Johan Mamani Larico 2022-5-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1717225-separate-rain-events-by-specific-dry-period

评论： Jovon Jacob 2023-1-8

采纳的回答： Image Analyst

Hi

I have hourly rain data for a period of 5 years

x = [0 0 0 0 0 2 4 5 14 10 16 0 0 0 0 0 24 33 22 0 0 2 3 5 0 0 0 0.........]

I need to group them considering that each rain event is separated by 3 hours of zero values or more

How could I get the numbers of rain events, their mean rain value and duration of each event?

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Answer 1

Image Analyst 2022-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/1717225-separate-rain-events-by-specific-dry-period#answer_962345

在 MATLAB Online 中打开

Try this, if you have the Image Processing Toolbox.

x = [0 0 0 0 0 2 4 5 14 10 16 0 0 0 0 0 24 33 22 0 0 2 3 5 0 0 0 0]
props = regionprops(x > 0, x, 'Area', 'MeanIntensity')
numberOfRainPeriods = length(props)
stormLengths = [props.Area] % In hours
meanRainPerHour = [props.MeanIntensity] % In mm or whatever.
integratedRainTotalsPerStorm = stormLengths .* meanRainPerHour % In mm or whatever.