Pandas - Group/bins of data per longitude/latitude

Question

I have a bunch of geographical data as below. I would like to group the data by bins of .2 degrees in longitude AND .2 degree in latitude.

While it is trivial to do

Answer 1

How about this?

step = 0.2
to_bin = lambda x: np.floor(x / step) * step
df["latbin"] = df.Latitude.map(to_bin)
df["lonbin"] = df.Longitude.map(to_bin)
groups = df.groupby(("latbin", "lonbin"))