ee.Number.atan2

Page Summary

• The atan2 method calculates the angle formed by a 2D vector [x, y].

• The method takes two arguments: this representing the x-value and right representing the y-value.

• The result is a Number representing the angle.

• The examples show how to use atan2 in JavaScript and Python to find angles for different points.

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)

// 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

Colab (Python)

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