# xrspatial.proximity.great_circle_distance¶

xrspatial.proximity.great_circle_distance(x1: float, x2: float, y1: float, y2: float, radius: float = 6378137) float[source]

Calculates great-circle (orthodromic/spherical) distance between (x1, y1) and (x2, y2), assuming each point is a longitude, latitude pair.

Parameters
• x1 (float) – x-coordinate (latitude) between -180 and 180 of the first point.

• x2 (float) – x-coordinate (latitude) between -180 and 180 of the second point.

• y1 (float) – y-coordinate (longitude) between -90 and 90 of the first point.

• y2 (float) – y-coordinate (longitude) between -90 and 90 of the second point.

Returns

distance – Great-Circle distance between two points.

Return type

float

References

Examples

```>>> # Imports
>>> from xrspatial import great_circle_distance

>>> point_a = (123.2, 82.32)
>>> point_b = (178.0, 65.09)

>>> # Calculate Euclidean Distance
>>> dist = great_circle_distance(
point_a,
point_b,
point_a,
point_b,
)
>>> print(dist)
2378290.489801402
```