Add GeoHash and XYZ Grids

[njanakiev]

Great project! I think Geohash (e.g. https://github.com/hkwi/python-geohash) and XYZ Grid might be a great addition (e.g. https://github.com/mapbox/mercantile)

[JoaoCarabetta]

Hi, thanks!

I was taking a look at these grids. They are certainly great additions to the package.

One question though,

Are XYZ Grid the same as quadtrees? Because the project API documentation has conversion examples between them

[njanakiev]

From what I understood it is the same segmentation, so perhaps a conversion might be sufficient there (Use Bing Quadkey tiles instead of x/y/z tiles in leafletjs map)

By the way, there are some nuances with TMS tiles, WMTS tiles and XYZ tiles (What are the Differences Between TMS, XYZ & WMTS?).

[JoaoCarabetta]

Thanks! I will take a deeper look.