AI-generated Key Takeaways
-
The
arrayProjectmethod projects the array in each pixel to a lower dimensional space by specifying the axes to retain. -
Dropped axes must have a length of at most 1.
| Usage | Returns |
|---|---|
Image.
arrayProject
(axes)
|
Image |
| Argument | Type | Details |
|---|---|---|
|
this:
input
|
Image | Input image. |
axes
|
List | The axes to retain. Other axes will be discarded and must be at most length 1. |
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' ); } // Create a 2D array image with the 0-axis having length 6 and the 1-axis // having length 1. var arrayImg2D = ee . Image ([ 0 , 1 , 2 , 3 , 4 , 5 ]). toArray (). toArray ( 1 ); print ( '2D array image (pixel)' , sampArrImg ( arrayImg2D )); // [[0], // [1], // [2], // [3], // [4], // [5]] // Project the 2D array to a 1D array, retain the 0-axis (concatenate elements // from the 1-axis into the 0-axis). var arrayImg2Dto1D = arrayImg2D . arrayProject ([ 0 ]); print ( '2D array image (pixel)' , sampArrImg ( arrayImg2Dto1D )); // [0, 1, 2, 3, 4, 5]
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' ) # Create a 2D array image with the 0-axis having length 6 and the 1-axis # having length 1. array_img_2d = ee . Image ([ 0 , 1 , 2 , 3 , 4 , 5 ]) . toArray () . toArray ( 1 ) display ( '2D array image (pixel):' , samp_arr_img ( array_img_2d )) # [[0], # [1], # [2], # [3], # [4], # [5]] # Project the 2D array to a 1D array, retain the 0-axis (concatenate elements # from the 1-axis into the 0-axis). array_img_2d_to_1d = array_img_2d . arrayProject ([ 0 ]) display ( '2D array image (pixel):' , samp_arr_img ( array_img_2d_to_1d )) # [0, 1, 2, 3, 4, 5]
