ee.Image.arrayGet

  • For each band, an output band of the same name is created with the value at the given position extracted from the input multidimensional pixel in that band.

  • The Image.arrayGet(position) function returns an Image where the value at the given position is extracted from the input multidimensional pixel.

  • The position argument is an Image specifying the coordinates of the element to get and must have as many scalar bands as the input image has dimensions.

 For each band, an output band of the same name is created with the value at the given position extracted from the input multidimensional pixel in that band.

UsageReturns
Image.arrayGet(position)Image
ArgumentTypeDetails
this: imageImageArray to get an element from.
positionImageThe coordinates of the element to get. There must be as many scalar bands as there are dimensions in the input image.

Examples

Code Editor (JavaScript)

// A function to print the array 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 1D array image.
var arrayImg1D = ee.Image([0, 1, 2, 3, 4, 5]).toArray();
print('1D array image (pixel)', sampArrImg(arrayImg1D));
// [0, 1, 2, 3, 4, 5]

// Get the array value at a given position. Here we target the 4th element.
var position1D = ee.Image([3]);
var selectedElement1D = arrayImg1D.arrayGet(position1D);
print('Element at position [3] (4th element)', sampArrImg(selectedElement1D));
// [3]

// Create a 2D 2x3 array image (reshape the 1D array image).
var arrayImg2D = arrayImg1D.arrayReshape(ee.Image([2, 3]).toArray(), 2);
print('2D 2x3 array image (pixel)', sampArrImg(arrayImg2D));
// [[0, 1, 2],
//  [3, 4, 5]]

// Get the array element value at axis-0, position 0 and axis-1, position 2.
var position2D = ee.Image([0, 2]);
var selectedElement2D = arrayImg2D.arrayGet(position2D);
print('Element at position [0, 2]', sampArrImg(selectedElement2D));
// 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)

# A function to print the array 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 1D array image.
array_img_1d = ee.Image([0, 1, 2, 3, 4, 5]).toArray()
print('1D array image (pixel):', samp_arr_img(array_img_1d).getInfo())
# [0, 1, 2, 3, 4, 5]

# Get the array value at a given position. Here we target the 4th element.
position_1d = ee.Image([3])
selected_element_1d = array_img_1d.arrayGet(position_1d)
print(
    'Element at position [3] (4th element):',
    samp_arr_img(selected_element_1d).getInfo()
)
# [3]

# Create a 2D 2x3 array image (reshape the 1D array image).
array_img_2d = array_img_1d.arrayReshape(ee.Image([2, 3]).toArray(), 2)
print('2D 2x3 array image (pixel):', samp_arr_img(array_img_2d).getInfo())
# [[0, 1, 2],
#  [3, 4, 5]]

# Get the array element value at axis-0, position 0 and axis-1, position 2.
position_2d = ee.Image([0, 2])
selected_element_2d = array_img_2d.arrayGet(position_2d)
print(
    'Element at position [0, 2]:',
    samp_arr_img(selected_element_2d).getInfo()
)
# 2