ee.Image.arrayPad

Pads the array values in each pixel to be a fixed length. The pad value will be appended to each array to extend it to given length along each axis. All bands of the image must be array-valued and have the same dimensions.

Usage	Returns
Image.arrayPad(lengths, pad)	Image

Argument	Type	Details
this: image	Image	Array image to pad.
lengths	List	A list of desired lengths for each axis in the output arrays. Arrays are already as large or larger than the given length will be unchanged along that axis
pad	Number, default: 0	The value to pad with.

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]).toArray();
print('1D array image (pixel)', sampArrImg(arrayImg1D));
// [0, 1, 2]

// Pad 1D array to length of 5 with value 9.
var arrayImg1Dpad = arrayImg1D.arrayPad([5], 9);
print('1D array image padded', sampArrImg(arrayImg1Dpad));
// [0, 1, 2, 9, 9]

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

// Pad 2D array to 0-axis length 3 and 1-axis length 5 with value 9.
var arrayImg2Dpad = arrayImg2D.arrayPad([3, 5], 9);
print('2D array image padded', sampArrImg(arrayImg2Dpad));
// [[0, 1, 2, 9, 9],
//  [3, 4, 5, 9, 9],
//  [9, 9, 9, 9, 9]]

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]).toArray()
print('1D array image (pixel):', samp_arr_img(array_img_1d).getInfo())
# [0, 1, 2]

# Pad 1D array to length of 5 with value 9.
array_img_1d_pad = array_img_1d.arrayPad([5], 9)
print('1D array image padded:', samp_arr_img(array_img_1d_pad).getInfo())
# [0, 1, 2, 9, 9]

# Create a 2D array image.
array_img_2d = ee.Image([0, 1, 2, 3, 4, 5]).toArray().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]]

# Pad 2D array to 0-axis length 3 and 1-axis length 5 with value 9.
array_img_2d_pad = array_img_2d.arrayPad([3, 5], 9)
print('2D array image padded:', samp_arr_img(array_img_2d_pad).getInfo())
# [[0, 1, 2, 9, 9],
#  [3, 4, 5, 9, 9],
#  [9, 9, 9, 9, 9]]