how to select and delete unwanted coordinates from a set of data obtained by find() command from an binary image of a river.

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Hernán Madrid Oyarzún 2020-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/504447-how-to-select-and-delete-unwanted-coordinates-from-a-set-of-data-obtained-by-find-command-from-an

hi, i´m trying to find distances from a curve obtained by a binary image from a river. Precisely i´m using the "Arclength()" function (https://la.mathworks.com/matlabcentral/fileexchange/34871-arclength)

the principal issue is there´s some points that screw everything by being aberrant and not having the desired tendency

to find the coordinates form this image i have used "find()" comand and get the local coordinates, but, after ploting the data i noticed that there´s some points in the same "x" axis that have multiple data in "y" axis.

I need help to be able to optimize my code and automatically delete the data where this occurs and join them with the ends because I need to do this procedure with multiple images.

by the way, i use this code. thanks

a=imread('valdivia1analizar.png');
imshow(a);
impixelinfo;
b=im2bw(a);
%%  step 2: Find TALWEG
figure,imshow(b)
impixelinfo;
C=watershed(bwdist(b))==0;
[icoords,jcoords]=find(C);