ee.Image.toArray

Concatena los píxeles de cada banda en un solo array por píxel. El resultado se enmascarará si se enmascara alguna banda de entrada.

Uso	Muestra
Image.toArray(axis)	Imagen

Argumento	Tipo	Detalles
esta: image	Imagen	Imagen de las bandas que se convertirán en un array por píxel. Las bandas deben tener píxeles escalares o píxeles de array con la misma dimensionalidad.
axis	Número entero, valor predeterminado: 0	Eje a lo largo del cual se concatenará; debe ser al menos 0 y, como máximo, la dimensión de las entradas. Si el eje es igual a la dimensión de las entradas, el resultado tendrá 1 dimensión más que las entradas.

Ejemplos

Editor de código (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');
}

// A 3-band image of constants.
var img = ee.Image([0, 1, 2]);
print('3-band image', img);

// Convert the 3-band image to an array image. The resulting array image has a
// single band named "array". The "array" band stores the per-pixel band values
// from the input ee.Image as a 1D array.
var arrayImg1D = img.toArray();
print('1D array image', arrayImg1D);

// Sample a single pixel to see its 1D array using the `sampArrImg` function
// defined above. Similar arrays are present for all pixels in a given array
// image; looking at just one helps conceptualize the structure.
print('1D array image (pixel)', sampArrImg(arrayImg1D));
// [0, 1, 2]

// Array images can be displayed to the Code Editor map and queried with the
// inspector tool. Per-pixel, the first element in the array is shown.
// Single-band grayscale is used to represent the data. Style parameters `min`
// and `max` are valid. Styling the layer with the Code Editor's layer
// visualization tool is invalid.
Map.addLayer(arrayImg1D, {min: 0, max: 2}, 'Image array');

// Create a 2D array image by concatenating the values in a 1D array image
// along the 1-axis using `toArray(1)`. For a 3D array, apply `toArray(2)` to
// the result.
var arrayImg2D = arrayImg1D.toArray(1);
print('2D array image (pixel)', sampArrImg(arrayImg2D));
// [[0],
//  [1],
//  [2]]

Configuración de Python

Consulta la página Entorno de Python para obtener información sobre la API de Python y el uso de geemap para el desarrollo interactivo.

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')


# A 3-band image of constants.
img = ee.Image([0, 1, 2])
display('3-band image', img)

# Convert the 3-band image to an array image. The resulting array image has a
# single band named "array". The "array" band stores the per-pixel band values
# from the input ee.Image as a 1D array.
array_img_1_d = img.toArray()
display('1D array image', array_img_1_d)

# Sample a single pixel to see its 1D array using the `samp_arr_img` function
# defined above. Similar arrays are present for all pixels in a given array
# image looking at just one helps conceptualize the structure.
display('1D array image (pixel)', samp_arr_img(array_img_1_d))
# [0, 1, 2]

# Array images can be displayed to the Code Editor map and queried with the
# inspector tool. Per-pixel, the first element in the array is shown.
# Single-band grayscale is used to represent the data. Style parameters `min`
# and `max` are valid. Styling the layer with the Code Editor's layer
# visualization tool is invalid.
m = geemap.Map()
m.add_layer(array_img_1_d, {'min': 0, 'max': 2}, 'Image array')
display(m)

# Create a 2D array image by concatenating the values in a 1D array image
# along the 1-axis using `toArray(1)`. For a 3D array, apply `toArray(2)` to
# the result.
array_img_2_d = array_img_1_d.toArray(1)
display('2D array image (pixel)', samp_arr_img(array_img_2_d))
# [[0],
#  [1],
#  [2]]