All possible points of (latitude,longitude) from latitude/longitude coordinates in separate arrays

Question

I have latitude and longitude coordinates in two separate arrays:

a = np.array([71,75])
b = np.array([43,42])

How can I easily find all possible points made up of these coordinates?

I've been messing around with itertools.combinations:

In [43]:

list(itertools.combinations(np.concatenate([a,b]), r=2))

Out[43]:

[(71, 75), (71, 43), (71, 42), (75, 43), (75, 42), (43, 42)]

but this doesn't work for me because the points (71,75) and (43,42) are latitude/latitude and longitude/longitude pairs.

What I would like to have is this:

Out[43]:

    [(71, 43), (71, 42), (75, 43), (75, 42)]

The a and b arrays will eventually be of a larger size but will be kept the same size as they are latitude/longitude pairs.

Answer 1

What you want is itertools.product():

from itertools import product

list(product(a, b))
#[(71, 43), (71, 42), (75, 43), (75, 42)]

Answer 2

Just do two for loops that are nested and go over both arrays for i=0 to len(a) do for j=0 to len(b) do out.add(coordinate(a[i],b[j]);