ee.Image.arrayCat

Crea un'immagine array concatenando ogni pixel dell'array lungo l'asse specificato in ogni banda.

Utilizzo	Resi
Image.arrayCat(image2, axis)	Immagine

Argomento	Tipo	Dettagli
questo: image1	Immagine	La prima immagine dell'array da concatenare.
image2	Immagine	Seconda immagine dell'array da concatenare.
axis	Numero intero	Asse lungo cui concatenare.

Esempi

Editor di codice (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]]

Configurazione di Python

Consulta la pagina Ambiente Python per informazioni sull'API Python e sull'utilizzo di geemap per lo sviluppo interattivo.

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()
display('1D array image (A) (pixel):', samp_arr_img(array_img_1d_a))
# [0, 1, 2]
array_img_1d_b = ee.Image([3, 4, 5]).toArray()
display('1D array image (B) (pixel):', samp_arr_img(array_img_1d_b))
# [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)
display(
    'Concatenate 1D array images on 0-axis:',
    samp_arr_img(array_img_1d_cat_ax0)
)
# [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)
display(
    'Concatenate 1D array images on 1-axis:',
    samp_arr_img(array_img_1d_cat_ax1)
)
# [[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)
display('2D array image (A) (pixel):', samp_arr_img(array_img_2d_a))
# [[0],
#  [1],
#  [2]]
array_img_2d_b = array_img_1d_b.toArray(1)
display('2D array image (B) (pixel):', samp_arr_img(array_img_2d_b))
# [[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)
display(
    'Concatenate 2D array images on 0-axis:',
    samp_arr_img(array_img_2d_cat_ax0)
)
# [[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)
display(
    'Concatenate 2D array images on 1-axis:',
    samp_arr_img(array_img_2d_cat_ax1)
)
# [[0, 3],
#  [1, 4],
#  [2, 5]]