How to export contour plot as shape file?

Question

Amra Rajuli 2018-4-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/395938-how-to-export-contour-plot-as-shape-file

评论： Ozgur Kirca 2023-12-6

Hi, I want to export result of plotting as shapefile. Before, I use several syntaxes, like shapewrite, but it does not work. Thank you.

 [X,Y,Z] = peaks;
 figure
 A=contour(X,Y,Z,20);
 shapewrite(A,'contour.shp')

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Answer 1

KSSV 2018-4-19

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https://ww2.mathworks.cn/matlabcentral/answers/395938-how-to-export-contour-plot-as-shape-file#answer_315957

编辑：KSSV 2018-4-19

在 MATLAB Online 中打开

[X,Y,Z] = peaks;
figure
A=contour(X,Y,Z,20);
% shapewrite(A,'contour.shp')

x = A(1,:) ;
y = A(2,:) ;
Data = struct([]) ;  % initilaize structure
for i = 1:length(x)
    Data(i).Geometry = 'Point' ;
    Data(i).X=x(i)  ;  % x value 
    Data(i).Y =y(i) ;  % y value
    Data(i).Name = randseq(1) ;   % some random attribute/ name
end
shapewrite(Data, 'myfile.shp')

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Max Friedrich 2021-2-4

在 MATLAB Online 中打开

In your attached figure you are asking where a set of extra scattered points come from. It may come from the contour matrix A itself. For each new contour line extra information is stored. The code provided by KSSV is interpreting this information as coordinates. Following example (based on KSSV solution) solves that problem:

x_cont = A(1,:);
y_cont = A(2,:);
count_parts=1;
idx=1;
while idx<length(y_cont) % extracts each single contour
    part(count_parts,:)=[idx+1 idx+y_cont(idx)];
    idx=idx+y_cont(idx)+1;
    count_parts=count_parts+1;
end
count_parts=count_parts-1;
Data = struct([]) ;  % initilaize structure
for i = 1:count_parts
    Data(i).Geometry = 'Line' ;
    Data(i).X=x_cont(part(i,1):part(i,2))  ;  % x value 
    Data(i).Y =y_cont(part(i,1):part(i,2)) ;  % y value
    Data(i).Z =x_cont(part(i,1)-1) ;   % store the contour value
end
shapewrite(Data, 'myfile.shp')