ee.Dictionary.map

    • Dictionary.map applies an algorithm to each key-value pair in a dictionary.

    • The algorithm takes a key and its corresponding value as arguments and returns a new value for that key.

    • If the algorithm returns null for a key, that key is removed from the resulting dictionary.

     Map an algorithm over a dictionary. The algorithm is expected to take 2 arguments, a key from the existing dictionary and the value it corresponds to, and return a new value for the given key. If the algorithm returns null, the key is dropped.
    Usage Returns
    Dictionary. map (baseAlgorithm) Dictionary
    Argument Type Details
    this: dictionary
    		Dictionary
    baseAlgorithm
    		Algorithm

    Examples

    Code Editor (JavaScript) 

     // A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image). 
 var 
  
 dict 
  
 = 
  
 ee 
 . 
 Dictionary 
 ({ 
  
 B1 
 : 
  
 182 
 , 
  
 B2 
 : 
  
 219 
 , 
  
 B3 
 : 
  
 443 
 }); 
 /** 
 * Convert S2 surface reflectance units to native scale. 
 */ 
 function 
  
 scale 
 ( 
 key 
 , 
  
 value 
 ) 
  
 { 
  
 return 
  
 ee 
 . 
 Number 
 ( 
 value 
 ). 
 divide 
 ( 
 1e4 
 ); 
 } 
 print 
 ( 
 'S2 surface reflectance in native units' 
 , 
  
 dict 
 . 
 map 
 ( 
 scale 
 ));

    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) 

     # A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image). 
 dic 
 = 
 ee 
 . 
 Dictionary 
 ({ 
 'B1' 
 : 
 182 
 , 
 'B2' 
 : 
 219 
 , 
 'B3' 
 : 
 443 
 }) 
 def 
  
 scale 
 ( 
 key 
 , 
 value 
 ): 
  
 """Convert S2 surface reflectance units to native scale.""" 
 return 
 ee 
 . 
 Number 
 ( 
 value 
 ) 
 . 
 divide 
 ( 
 1e4 
 ) 
 display 
 ( 
 'S2 surface reflectance in native units:' 
 , 
 dic 
 . 
 map 
 ( 
 scale 
 ))
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