How to mask a data using the contour closed line?

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Subhodh Sharma
Subhodh Sharma 2022-7-10
评论： Subhodh Sharma 2022-7-11
I have a lower resolution data. If I do masking using shapefile some portion around the boundary is getting cut. I just want to mention I don't want to interpolate.
Therefore, I am looking a for a solution where I can mask the data using contour lines itself. Regardless of whether a whole/half pixel coming inside of it. I want to show even a small portion of the pixel coming inside of it. I also don't want to show anything outisde the contour line.
I hope you could understand what I am looking for. You can see a figure attached below. You could see a Indian boundary contour, I just want to make outside that region white insider the rectangle box. Other things (colorbar,xticks,yticks) I want to keep at it's.
Looking forward to your suggestion.
Thanks in advance.

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回答（1 个）

KSSV
KSSV 2022-7-10
Read about inpolygon. Using this you can get the indices lying inside and outside the closed shape. Using tese indices you can make the puter points NaN and the plot.
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Image Analyst
Image Analyst 2022-7-10
Tell us exactly what functions and arguments you used to display the image and the black outline.
Subhodh Sharma
Subhodh Sharma 2022-7-11
@Image Analyst This is simple contourf plot (i.e., contourf(lon,lat,data)). And the black outline is just line plot made using plot function (like plot(lon,lat)).

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