add boundary

[HuangLiPang]

adding boundary option

[spatialsparks]

Hi HuangLiPang, sorry for the late reply and thx for the pull request. Your screenshot looks a bit weird at the edges, whats happening there? Or could you quickly show a side-by-side comparison of with boundary and without boundary? I am a bit sceptical about that blue ring on the bottom left where yellow transitions right to blue...
Best regards

[HuangLiPang]

Hi @JoranBeaufort !
Thank you for your comment.
I have a demo version which can see the interpolation value.
You can check the demo here.
I also fixed a half-cell length offset here.

[spatialsparks]

Hi @HuangLiPang
Thanks for the links, unfortunately the link is not working at the moment, Ill check back later. And The half cell offset was actually on purpose: the reasoning is that I wanted the data points which have the value of a cell to be in the middle (the centroid) of a cell. If you remove the half cell offset, then the "point" in your cell which actually has the interpolated value will be a corner of the cell which I found to be less intuitive.
Cheers

Edit: Try to replace "https" with "http" in https://cdn.leafletjs.com/leaflet/v1.0.0-beta.2/leaflet.js for the time being

[HuangLiPang]

I used incognito mode. The link works. Maybe you should hard fresh the browser since the demo is used gh-pages.
I got the point of the offset.

[spatialsparks]

Hm, I tried in incognito but get the same errors:

[HuangLiPang]

I got the same error when I used http, so I changed it to https.
I changed it to http now. Please try the link again.