Add a function to fill NaNs in a grid

[leouieda]

Description of the desired feature:

This is a surprisingly hard thing to do so it would be nice to have an easy function that does this. Here's what I propose:

def fill_nans(grid, neighbors=1):
    # Make the grid into a table
    # Make KNeighbors interpolator with the given neighbors
    # Fit the interpolator.
    # Predict on the NaN values
    # Make a new grid
    return filled_grid

Are you willing to help implement and maintain this feature?

Yes

Related to https://github.com/fatiando/harmonica/issues/396

[Phssilva]

Hello,

I Would like to contribute to thie feature. I'm geology student and work as a programmer, and i'm starting to contribute to open-source code in geosciences.

Regarding this feature, would the function go inside io.py?

[leouieda]

Hi @Phssilva thank you for volunteering! It could go into verde/utils.py for now. We can move it and some other functions into a separate file later.

Do you need any help getting started? Make sure you've looked at our Contributing Guide and let us know if anything in there isn't clear.

[Phssilva]

Hi @leouieda , I've read about contributions, and here we go, starting my first contribution to an open-source code. Thanks for your attention. If I have any questions regarding the implementation, I'll put them there.

[leouieda]

Awesome! Thank you for taking this on.

Please open the pull request as soon as you have a commit. It doesn't have to be done before you open the PR. Having the PR open gives us a place to discuss and ask questions. Plus, it lets us know how you're progressing.