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 two 1D array images.
var arrayImg1Da = ee.Image([0, 1, 2]).toArray();
print('1D array image (A) (pixel)', sampArrImg(arrayImg1Da));
// [0, 1, 2]
var arrayImg1Db = ee.Image([3, 4, 5]).toArray();
print('1D array image (B) (pixel)', sampArrImg(arrayImg1Db));
// [3, 4, 5]
// Concatenate 1D array image B to 1D array image A on 0-axis (rows).
var arrayImg1DcatAx0 = arrayImg1Da.arrayCat(arrayImg1Db, 0);
print('Concatenate 1D array images on 0-axis', sampArrImg(arrayImg1DcatAx0));
// [0, 1, 2, 3, 4, 5]
// Concatenate 1D array image B to 1D array image A on 1-axis (columns).
var arrayImg1DcatAx1 = arrayImg1Da.arrayCat(arrayImg1Db, 1);
print('Concatenate 1D array images on 1-axis', sampArrImg(arrayImg1DcatAx1));
// [[0, 3],
// [1, 4]
// [2, 5]]
// Create two 2D array images (expand the dimensions of 1D arrays).
var arrayImg2Da = arrayImg1Da.toArray(1);
print('2D array image (A) (pixel)', sampArrImg(arrayImg2Da));
// [[0],
// [1],
// [2]]
var arrayImg2Db = arrayImg1Db.toArray(1);
print('2D array image (B) (pixel)', sampArrImg(arrayImg2Db));
// [[3],
// [4],
// [5]]
// Concatenate 2D array image B to 2D array image A on 0-axis (rows).
var arrayImg2DcatAx0 = arrayImg2Da.arrayCat(arrayImg2Db, 0);
print('Concatenate 2D array images on 0-axis', sampArrImg(arrayImg2DcatAx0));
// [[0],
// [1],
// [2],
// [3],
// [4],
// [5]]
// Concatenate 2D array image B to 2D array image A on 1-axis (columns).
var arrayImg2DcatAx1 = arrayImg2Da.arrayCat(arrayImg2Db, 1);
print('Concatenate 2D array images on 1-axis', sampArrImg(arrayImg2DcatAx1));
// [[0, 3],
// [1, 4],
// [2, 5]]
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 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 two 1D array images.
array_img_1d_a = ee.Image([0, 1, 2]).toArray()
print('1D array image (A) (pixel):', samp_arr_img(array_img_1d_a).getInfo())
# [0, 1, 2]
array_img_1d_b = ee.Image([3, 4, 5]).toArray()
print('1D array image (B) (pixel):', samp_arr_img(array_img_1d_b).getInfo())
# [3, 4, 5]
# Concatenate 1D array image B to 1D array image A on 0-axis (rows).
array_img_1d_cat_ax0 = array_img_1d_a.arrayCat(array_img_1d_b, 0)
print(
'Concatenate 1D array images on 0-axis:',
samp_arr_img(array_img_1d_cat_ax0).getInfo()
)
# [0, 1, 2, 3, 4, 5]
# Concatenate 1D array image B to 1D array image A on 1-axis (columns).
array_img_1d_cat_ax1 = array_img_1d_a.arrayCat(array_img_1d_b, 1)
print(
'Concatenate 1D array images on 1-axis:',
samp_arr_img(array_img_1d_cat_ax1).getInfo()
)
# [[0, 3],
# [1, 4]
# [2, 5]]
# Create two 2D array images (expand the dimensions of 1D arrays).
array_img_2d_a = array_img_1d_a.toArray(1)
print('2D array image (A) (pixel):', samp_arr_img(array_img_2d_a).getInfo())
# [[0],
# [1],
# [2]]
array_img_2d_b = array_img_1d_b.toArray(1)
print('2D array image (B) (pixel):', samp_arr_img(array_img_2d_b).getInfo())
# [[3],
# [4],
# [5]]
# Concatenate 2D array image B to 2D array image A on 0-axis (rows).
array_img_2d_cat_ax0 = array_img_2d_a.arrayCat(array_img_2d_b, 0)
print(
'Concatenate 2D array images on 0-axis:',
samp_arr_img(array_img_2d_cat_ax0).getInfo()
)
# [[0],
# [1],
# [2],
# [3],
# [4],
# [5]]
# Concatenate 2D array image B to 2D array image A on 1-axis (columns).
array_img_2d_cat_ax1 = array_img_2d_a.arrayCat(array_img_2d_b, 1)
print(
'Concatenate 2D array images on 1-axis:',
samp_arr_img(array_img_2d_cat_ax1).getInfo()
)
# [[0, 3],
# [1, 4],
# [2, 5]]