Specify CRS for sample points

[ejm714]

I tried passing in a point from google maps for the SF bay and got an error

 cyano predict-point -lat -122.3753 -lon 37.763987
...
ValueError: Latitude must be in the [-90; 90] range.

Which reminded me that we only support one CRS and don't specify what that is.

Minimum:

• [ ] add to help text which CRS is currently supported

Nice to have:

• [ ] allow CRS to be set at command line (at least for predict point)

[klwetstone]

@ejm714 I'm not sure this is a CRS issue. I think that point in the SF bay actually has latitude 37.763987 and longitude -122.3753 (switched - I have to look up latitude v longitude literally every time). cyano predict-point -lat 37 -lon -122 runs fine

I think we want the current behavior, at least for this failure. What fails is this line using geopy.distance.distance.destination: https://github.com/drivendataorg/cyanobacteria-prediction/blob/13d8fb38f63992d286baea36846672d20feba599/cyano/data/satellite_data.py#L45

From the geopy code here, they normalize longitude but don't normalize latitude because the normalization is less straightforward:

    if abs(latitude) > 90:
        warnings.warn('Latitude normalization has been prohibited in the newer '
                      'versions of geopy, because the normalized value happened '
                      'to be on a different pole, which is probably not what was '
                      'meant. If you pass coordinates as positional args, '
                      'please make sure that the order is '
                      '(latitude, longitude) or (y, x) in Cartesian terms.',
                      UserWarning, stacklevel=3)
        raise ValueError('Latitude must be in the [-90; 90] range.')

    if abs(longitude) > 180:
        # Longitude normalization is pretty straightforward and doesn't seem
        # to be error-prone, so there's nothing to complain about.
        longitude = _normalize_angle(longitude, 180.0)

[ejm714]

Ah yep you're right

The latitude of San Francisco, CA, USA is 37.773972, and the longitude is -122.431297.

Regardless, still good to support additional CRS, thanks for taking this on