ee.Image.arrayLength

 // A function to print arrays for a selected pixel in the following examples. 
 function 
  
 sampArrImg 
 ( 
 arrImg 
 ) 
  
 { 
  
 var 
  
 point 
  
 = 
  
 ee 
 . 
 Geometry 
 . 
 Point 
 ([ 
 - 
 121 
 , 
  
 42 
 ]); 
  
 return 
  
 arrImg 
 . 
 sample 
 ( 
 point 
 , 
  
 500 
 ). 
 first 
 (). 
 get 
 ( 
 'array' 
 ); 
 } 
 // A 3-band image of constants. 
 var 
  
 img 
  
 = 
  
 ee 
 . 
 Image 
 ([ 
 0 
 , 
  
 1 
 , 
  
 2 
 ]); 
 print 
 ( 
 '3-band image' 
 , 
  
 img 
 ); 
 // Convert the 3-band image to a 2D array image. 
 var 
  
 arrayImg2D 
  
 = 
  
 img 
 . 
 toArray 
 (). 
 toArray 
 ( 
 1 
 ); 
 print 
 ( 
 '2D array image (pixel)' 
 , 
  
 sampArrImg 
 ( 
 arrayImg2D 
 )); 
 // [[0], 
 //  [1], 
 //  [2]] 
 // Get the number of dimensions in each pixel's array. 
 var 
  
 arrayImg2Ddim 
  
 = 
  
 arrayImg2D 
 . 
 arrayDimensions 
 (); 
 print 
 ( 
 'N dimensions in array' 
 , 
  
 sampArrImg 
 ( 
 arrayImg2Ddim 
 )); 
 // 2 
 // Get the array length per dimension per pixel. 
 var 
  
 arrayImg2DdimLen 
  
 = 
  
 arrayImg2D 
 . 
 arrayLengths 
 (); 
 print 
 ( 
 'Array length per dimension' 
 , 
  
 sampArrImg 
 ( 
 arrayImg2DdimLen 
 )); 
 // [3, 1] 
 // Get the array length for 0-axis (rows). 
 var 
  
 arrayImg2Daxis0Len 
  
 = 
  
 arrayImg2D 
 . 
 arrayLength 
 ( 
 0 
 ); 
 print 
 ( 
 'Array length 0-axis (rows)' 
 , 
  
 sampArrImg 
 ( 
 arrayImg2Daxis0Len 
 )); 
 // 3 
 // Get the array length for 1-axis (columns). 
 var 
  
 arrayImg2Daxis1Len 
  
 = 
  
 arrayImg2D 
 . 
 arrayLength 
 ( 
 1 
 ); 
 print 
 ( 
 'Array length 1-axis (columns)' 
 , 
  
 sampArrImg 
 ( 
 arrayImg2Daxis1Len 
 )); 
 // 1 

 # A function to print arrays for a selected pixel in the following examples. 
 def 
  
 samp_arr_img 
 ( 
 arr_img 
 ): 
 point 
 = 
 ee 
 . 
 Geometry 
 . 
 Point 
 ([ 
 - 
 121 
 , 
 42 
 ]) 
 return 
 arr_img 
 . 
 sample 
 ( 
 point 
 , 
 500 
 ) 
 . 
 first 
 () 
 . 
 get 
 ( 
 'array' 
 ) 
 # A 3-band image of constants. 
 img 
 = 
 ee 
 . 
 Image 
 ([ 
 0 
 , 
 1 
 , 
 2 
 ]) 
 display 
 ( 
 '3-band image:' 
 , 
 img 
 ) 
 # Convert the 3-band image to a 2D array image. 
 array_img_2d 
 = 
 img 
 . 
 toArray 
 () 
 . 
 toArray 
 ( 
 1 
 ) 
 display 
 ( 
 '2D array image (pixel):' 
 , 
 samp_arr_img 
 ( 
 array_img_2d 
 )) 
 # [[0], 
 #  [1], 
 #  [2]] 
 # Get the number of dimensions in each pixel's array. 
 array_img2d_dim 
 = 
 array_img_2d 
 . 
 arrayDimensions 
 () 
 display 
 ( 
 'N dimensions in array:' 
 , 
 samp_arr_img 
 ( 
 array_img2d_dim 
 )) 
 # 2 
 # Get the array length per dimension per pixel. 
 array_img_2d_dim_len 
 = 
 array_img_2d 
 . 
 arrayLengths 
 () 
 display 
 ( 
 'Array length per dimension:' 
 , 
 samp_arr_img 
 ( 
 array_img_2d_dim_len 
 ) 
 ) 
 # [3, 1] 
 # Get the array length for 0-axis (rows). 
 array_img2d_axis0_len 
 = 
 array_img_2d 
 . 
 arrayLength 
 ( 
 0 
 ) 
 display 
 ( 
 'Array length 0-axis (rows):' 
 , 
 samp_arr_img 
 ( 
 array_img2d_axis0_len 
 ) 
 ) 
 # 3 
 # Get the array length for 1-axis (columns). 
 array_img_2d_axis1_len 
 = 
 array_img_2d 
 . 
 arrayLength 
 ( 
 1 
 ) 
 display 
 ( 
 'Array length 1-axis (columns):' 
 , 
 samp_arr_img 
 ( 
 array_img_2d_axis1_len 
 ) 
 ) 
 # 1