ee.Number.atan2

Calculates the angle formed by the 2D vector [x, y].

Usage	Returns
Number.atan2(right)	Number

Argument	Type	Details
this: left	Number	The left-hand value.
right	Number	The right-hand value.

Examples

Code Editor (JavaScript)Colab (Python)

// Left input is x and right input is y, representing point (x,y).
print('Atan2 of point (0,0)', ee.Number(0).atan2(0));  // 0
print('Atan2 of point (1,0)', ee.Number(1).atan2(0));  // 0
print('Atan2 of point (0,1)', ee.Number(0).atan2(1));  // 1.570796326 (π/2)
print('Atan2 of point (-1,0)', ee.Number(-1).atan2(0));  // 3.141592653 (π)
print('Atan2 of point (0,-1)', ee.Number(0).atan2(-1));  // -1.570796326 (-π/2)

Python setup

See the Python Environment page for information on the Python API and using geemap for interactive development.

import ee
import geemap.core as geemap

print('Atan2 of point (0,0):', ee.Number(0).atan2(0).getInfo())  # 0
print('Atan2 of point (1,0):', ee.Number(1).atan2(0).getInfo())  # 0
# 1.570796326 (π/2)
print('Atan2 of point (0,1):', ee.Number(0).atan2(1).getInfo())
# 3.141592653 (π)
print('Atan2 of point (-1,0):', ee.Number(-1).atan2(0).getInfo())
# -1.570796326 (-π/2)
print('Atan2 of point (0,-1):', ee.Number(0).atan2(-1).getInfo())