Find values within a contour and replace with nan
5 views (last 30 days)
Show older comments
Hi,
I have a contour (bathymetry) line with a column of values x, y. I also have a dataset of chlorophyll values (XX,YY,Chl) scattered on the map. I would like find all the Chl values within the contour and replace with NaN. Is it also possible to choose a distance, say 3 km, outside the contour line and replace all those values with NaN?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/473998/image.jpeg)
0 Comments
Answers (1)
Adam Danz
on 30 Dec 2020
It sounds like the goal is to hide the scatter points under the contour in which case it would be easiest to use the (x,y) coordinates that define the contour to create a white patch that's plotted on top of the existing objects.
3 Comments
Image Analyst
on 30 Dec 2020
Can you upload data and code to reproduce your diagram? Make it easy for us to help you.
Adam Danz
on 30 Dec 2020
Edited: Adam Danz
on 30 Dec 2020
In that case I would recommend inpolygon as you have discovered. If you want to remove all points within the larger contour, you should only use the (x,y) coordinates that define the outer contour and remove the coordinates that define the inner contours.
If you want to remove all points within the larger contour that are not within the inner contours, follow this example,
If you're having further problems, provide more detail.
See Also
Categories
Find more on Contour Plots in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!