Issue with 2D Planar Area Calculation Using surf

1 次查看（过去 30 天）
peter huang
peter huang 2025-7-24
编辑： Matt J 2025-7-24
Hello MATLAB community,
I would like to ask how to calculate the area of a colored region from a surf plot.
For example, in the figure I’m working with, I want to determine the concentration area where the value is greater than 0.2.
My current idea is to extract the outer boundary of that region and use polyarea to calculate the area.
However, the boundary function in MATLAB doesn't seem to work properly in this context.
Below is the code I’m currently working with.
Any help or suggestions would be greatly appreciated.
Thank you very much for your support!

请先登录，再回答此问题。

回答（1 个）

Matt J
Matt J 2025-7-24
编辑：Matt J 2025-7-24
Ran in:
You may havee to regrid the data so that it is uniformly spaced and also scale the area calculation by the pixel area:
load max_Layer1.mat
BW=281000<=GX&GX<=293000&...
2780000<=GY&GY<=2790000&...
2e-4 <=max_Layer1&max_Layer1<=15*10^-4;
area=bwarea(BW),
area = 1.2016e+03
imshow(BW',[])
●

类别

在 Help Center 和 File Exchange 中查找有关 Contour Plots 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by