Area in 3-D temperature plot

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Tyler Menz
Tyler Menz 2020-5-20
评论： Star Strider 2020-5-21
Hello,
I have a set of oceanographic data with longitude, depth, and temperature. I've used contour3 to make a 3-D image of the data. Now I would like to find the area within the 6-8 deg C temperature range. Is there any way to do this withing Matlab? This is the code I've been using. Thank you!
load 'upcast';
lat = upcast(:,2);
long = upcast(:,3);
depth = upcast(:,4);
temp= upcast(:,5)
x = (upcast(:,3)); %long
y = (upcast(:,4)); %depth
z = (upcast(:,5)); %temp
xv = linspace(min(x),max(x));
yv = linspace(min(y),max(y));
[X,Y] = meshgrid(xv,yv);
Z = griddata(x,y,z,X,Y);
figure
contour3(X,Y,Z);
hold on
surf(X,Y,Z);
axis ij;
ylim ([0 100]);
colorbar
colormap 'jet'
grid off

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Star Strider
Star Strider 2020-5-20
Apparently, the contour3 call plots temperature contours as a function of longitude and depth. You can specify the levels at which you want the contours to be drawn: Contours at Specific Levels with Labels and also do that in a separate contour call if necessary to get only those specific levels.
The first output ‘M’ is the contour (x,y) coordinates (that here would be longitude and depth, see: M for details) that you can then use with trapz to get the areas.
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Tyler Menz
Tyler Menz 2020-5-21
Seems to be working! Thank you so much!

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