AI-generated Key Takeaways
-
The
Image.arrayLengths()method returns a 1D array image where each pixel contains the length of each axis of the array in the corresponding input pixel. -
The method takes an input image as an argument.
-
The output is an Image object.
| Usage | Returns |
|---|---|
Image.
arrayLengths
()
|
Image |
| Argument | Type | Details |
|---|---|---|
|
this:
input
|
Image | Input image. |
Examples
Code Editor (JavaScript)
// 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
import ee import geemap.core as geemap
Colab (Python)
# 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
