How extract boundary of red region in attached figure.

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varunesh
varunesh 2018-9-11
编辑： varunesh 2018-9-13
Hello All,
Actually, I want to make masking file of data above 1000m hight. I have already found a longitude and latitude of above 1000m height and plot that in red color but I want to just the boundary of this whole red plotted region. Please help me. Thank you so much in advance.
I am attaching figure and data. Below is code which I am using for plotting this.
z2 = z./9.8; z2 = z2';
xx = find((z2>1000));[x,y]=meshgrid(lons,lats);
plot(x,y,'*k')
hold on;plot(x(xx),y(xx),'*r');axis tight;

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回答（1 个）

Image Analyst
Image Analyst 2018-9-11
Do you have the Image Processing Toolbox? If so, simply use bwboundaries().
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Image Analyst
Image Analyst 2018-9-12
What do you REALLY want to accomplish? If you get this as an image, what would it help you do that you cannot do now?
varunesh
varunesh 2018-9-13
编辑：varunesh 2018-9-13
I had already said that I want to longitude and latitude of all boundaries. With the help that boundaries I will mask the original data. I have already one example boundary of Tibet(Above to northern India). I am sending you this example boundary and code. You can see that how do I mask data above 1000m height from sea level from the help of this Tibet boundary.
cst = load('tibet_bath1000.txt');
inix = inpolygon(ln,lt,cst(:,1),cst(:,2));
nnum(inix)=[];
ln and lt is original logitude and latitude of data.

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