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Finding Coordinates of Multiple Contours

조회 수: 2(최근 30일)
Brian DeCicco
Brian DeCicco 2021년 5월 21일
댓글: Adam Danz 2021년 5월 28일
Hello, I am working with a dataset and trying to find the coordinates (lat/long) of each contour drawn from my loop. When I run the loop, each new iteration replaces the the previous position data of the last contour drawn, and I wish to get the position data for all 40 lines drawn contained within the same matrix. The position data of the line (and each line) should be stored under the variable "C" which is a 2 x ? double matrix. I appreciated any assistance you may be able to provide! Below is my code thus far:
for n = 1:40
[C,h] = contour(long3,lat3,squeeze(yearly_array2(:,:,n))',[287 287],'y');
  댓글 수: 2
Brian DeCicco
Brian DeCicco 2021년 5월 21일
Thank you Adam, your response here was really helpful as well and I will try these in my coding!

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채택된 답변

KSSV 2021년 5월 21일
C = cell(40,1) ;
H = cell(40,1)
for n = 1:40 ;
[c,h] = contour(long3,lat3,squeeze(yearly_array2(:,:,n))',[287 287],'y');
C{n} = c ;
H{n} = h ;
  댓글 수: 2
Adam Danz
Adam Danz 2021년 5월 28일
@Brian DeCicco There are some files on the file exchange that organize the contour matrix output into a table, a structure, or a cell array. Here's a list:

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추가 답변(1개)

Steven Lord
Steven Lord 2021년 5월 21일
Why create the contours one at a time? Why not pass a vector of contour levels to the contour function and either parse the ContourMatrix property of the contour object or the contour matrix returned as the first output of contour? This will also eliminate the need to break the ambiguity of whether a scalar value represents a number of contours to plot or the height at which to plot one single contour line.
[X, Y, Z] = peaks;
surf(X, Y, Z);
hold on
[C, h] = contour3(X, Y, Z, -5:5, 'r'); % I could also have used surfc
shading interp
C(:, 1)
ans = 2×1
-5 25
This tells me the contour at z = -5 has 25 points.
C(:, 1+25+1) % 1 (first element) + 25 (points on first contour) + 1 (move to start of next contour)
ans = 2×1
-4 35
The contour at z = -4 has 35 points, etc.

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