ee.Number.atan2

    • 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 
 ))
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