intensity of dought events
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Hi, I have a drought duration over time file. So, it is the drought duration event where it contains consecutive months of negative value, so, i need to calculate the mean intensity of each drought events, can I do it in matlab?
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Sulaymon Eshkabilov
2021-6-12
Use can use mean()
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Sulaymon Eshkabilov
2021-6-12
Here is a nice discussion on how to locate consequitive numbers:
You can find relevant comments and answers to this question of yours.
Image Analyst
2021-6-12
You need to use regionprops(), which will get you both the length of each drought, as well as it's mean value. You can also get the max value if you want with 'MaxIntensity':
d = [1 -2 -2 -4 -5 -1 3 3 -3 -4.5 -8 5 6 7] % 2 regions of negative runs
% Find negative regions - binarize.
bw = d < 0
% Make measurements
props = regionprops(bw, d, 'Area', 'MeanIntensity');
% Get the lengths of all the runs
droughtDurations = [props.Area]
% Get the mean value for each of the 2 runs
droughtIntensities = [props.MeanIntensity]
You get:
bw =
1×14 logical array
0 1 1 1 1 1 0 0 1 1 1 0 0 0
droughtDurations =
5 3
droughtIntensities =
-2.8 -5.16666666666667
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Image Analyst
2021-6-13
OK we're getting there. So, say for a given long and lat, what if there are 5 or 10 or 15 droughts of longer than a certain duration during those 415 months? How do you convert that to a color? Do you simply sum up all the drought months over the 415 months?
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