ee.Image.arrayCat

Crée une image de tableau en concaténant chaque pixel de tableau le long de l'axe donné dans chaque bande.

Utilisation	Renvoie
Image.arrayCat(image2, axis)	Image

Argument	Type	Détails
ceci : image1	Image	Première image du tableau à concaténer.
image2	Image	Deuxième image de tableau à concaténer.
axis	Nombre entier	Axe le long duquel concaténer.

Exemples

Éditeur de code (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]]

Configuration de Python

Consultez la page Environnement Python pour en savoir plus sur l'API Python et sur l'utilisation de geemap pour le développement interactif.

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]]