ee.Image.arrayReshape
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Convertit les bandes de tableau d'une image avec des pixels de forme égale, éventuellement multidimensionnels, en une image de tableaux avec une nouvelle forme.
Utilisation | Renvoie |
---|
Image.arrayReshape(lengths, dimensions) | Image |
Argument | Type | Détails |
---|
ceci : image | Image | Image des tableaux à remodeler. |
lengths | Image | Image à une bande spécifiant les nouvelles longueurs de chaque axe de l'image d'entrée, sous la forme d'un tableau à une dimension par pixel. Chaque tableau de formes doit contenir des valeurs de longueur "dimensions". Si l'une des longueurs est définie sur -1, la longueur correspondante pour cet axe sera calculée de sorte que la taille totale reste constante. En particulier, une forme [-1] est aplatie en 1D. Au maximum, un seul composant de forme peut être défini sur -1. |
dimensions | Nombre entier | Nombre de dimensions partagées par tous les pixels du tableau de sortie. |
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 a 1D array image with length 6.
var arrayImg1D = ee.Image([0, 1, 2, 3, 4, 5]).toArray();
print('1D array image (pixel)', sampArrImg(arrayImg1D));
// [0, 1, 2, 3, 4, 5]
// Reshape the 1D 6-element array to a 2D 2 (row) x 3 (column) array. Notice
// that elements are filled row by row in the reshaped result.
var reshape2x3 = arrayImg1D.arrayReshape(ee.Image([2, 3]).toArray(), 2);
print('2D 2x3 array image (pixel)', sampArrImg(reshape2x3));
// [[0, 1, 2],
// [3, 4, 5]]
// Use -1 to auto-determine a dimension length. For example, here we set
// 3 rows and let Earth Engine determine the number of columns needed.
var reshape3x_ = arrayImg1D.arrayReshape(ee.Image([3, -1]).toArray(), 2);
print('2D 3x? array image (pixel)', sampArrImg(reshape3x_));
// [[0, 1],
// [2, 3],
// [4, 5]]
// Flatten a 2D 2x3 array to 1D 6-element array.
var flattened = reshape2x3.arrayReshape(ee.Image([-1]).toArray(), 1);
print('2D array flattened to 1D', sampArrImg(flattened));
// [0, 1, 2, 3, 4, 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 a 1D array image with length 6.
array_img_1d = ee.Image([0, 1, 2, 3, 4, 5]).toArray()
print('1D array image (pixel):', samp_arr_img(array_img_1d).getInfo())
# [0, 1, 2, 3, 4, 5]
# Reshape the 1D 6-element array to a 2D 2 (row) x 3 (column) array. Notice
# that elements are filled row by row in the reshaped result.
reshape2x3 = array_img_1d.arrayReshape(ee.Image([2, 3]).toArray(), 2)
print('2D 2x3 array image (pixel):', samp_arr_img(reshape2x3).getInfo())
# [[0, 1, 2],
# [3, 4, 5]]
# Use -1 to auto-determine a dimension length. For example, here we set
# 3 rows and let Earth Engine determine the number of columns needed.
reshape3x_ = array_img_1d.arrayReshape(ee.Image([3, -1]).toArray(), 2)
print('2D 3x? array image (pixel):', samp_arr_img(reshape3x_).getInfo())
# [[0, 1],
# [2, 3],
# [4, 5]]
# Flatten a 2D 2x3 array to 1D 6-element array.
flattened = reshape2x3.arrayReshape(ee.Image([-1]).toArray(), 1)
print('2D array flattened to 1D:', samp_arr_img(flattened).getInfo())
# [0, 1, 2, 3, 4, 5]
Sauf indication contraire, le contenu de cette page est régi par une licence Creative Commons Attribution 4.0, et les échantillons de code sont régis par une licence Apache 2.0. Pour en savoir plus, consultez les Règles du site Google Developers. Java est une marque déposée d'Oracle et/ou de ses sociétés affiliées.
Dernière mise à jour le 2025/07/26 (UTC).
[null,null,["Dernière mise à jour le 2025/07/26 (UTC)."],[[["\u003cp\u003e\u003ccode\u003eImage.arrayReshape()\u003c/code\u003e transforms images with array-shaped pixels into images with a new array shape, potentially changing the dimensionality of the pixels.\u003c/p\u003e\n"],["\u003cp\u003eIt takes the original image, desired lengths for each axis of the new shape, and the total number of dimensions as input.\u003c/p\u003e\n"],["\u003cp\u003eYou can specify \u003ccode\u003e-1\u003c/code\u003e for a dimension length to have Earth Engine automatically calculate it, ensuring the total number of elements remains constant.\u003c/p\u003e\n"],["\u003cp\u003eThis function is useful for tasks like converting between 1D, 2D, or higher-dimensional array representations of data within an image.\u003c/p\u003e\n"],["\u003cp\u003eExamples demonstrate reshaping a 1D array into a 2D array, using \u003ccode\u003e-1\u003c/code\u003e for automatic dimension calculation, and flattening a 2D array back to 1D.\u003c/p\u003e\n"]]],[],null,["# ee.Image.arrayReshape\n\nConverts array bands of an image with equally-shaped, possibly multidimensional pixels to an image of arrays with a new shape.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-------------------------------------------|---------|\n| Image.arrayReshape`(lengths, dimensions)` | Image |\n\n| Argument | Type | Details |\n|---------------|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `image` | Image | The image of arrays to reshape. |\n| `lengths` | Image | A 1-band image specifying the new lengths of each axis of the input image specified as a 1-D array per pixel. There should be 'dimensions' lengths values in each shape' array. If one of the lengths is -1, then the corresponding length for that axis will be computed such that the total size remains constant. In particular, a shape of \\[-1\\] flattens into 1-D. At most one component of shape can be -1. |\n| `dimensions` | Integer | The number of dimensions shared by all output array pixels. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// A function to print arrays for a selected pixel in the following examples.\nfunction sampArrImg(arrImg) {\n var point = ee.Geometry.Point([-121, 42]);\n return arrImg.sample(point, 500).first().get('array');\n}\n\n// Create a 1D array image with length 6.\nvar arrayImg1D = ee.Image([0, 1, 2, 3, 4, 5]).toArray();\nprint('1D array image (pixel)', sampArrImg(arrayImg1D));\n// [0, 1, 2, 3, 4, 5]\n\n// Reshape the 1D 6-element array to a 2D 2 (row) x 3 (column) array. Notice\n// that elements are filled row by row in the reshaped result.\nvar reshape2x3 = arrayImg1D.arrayReshape(ee.Image([2, 3]).toArray(), 2);\nprint('2D 2x3 array image (pixel)', sampArrImg(reshape2x3));\n// [[0, 1, 2],\n// [3, 4, 5]]\n\n// Use -1 to auto-determine a dimension length. For example, here we set\n// 3 rows and let Earth Engine determine the number of columns needed.\nvar reshape3x_ = arrayImg1D.arrayReshape(ee.Image([3, -1]).toArray(), 2);\nprint('2D 3x? array image (pixel)', sampArrImg(reshape3x_));\n// [[0, 1],\n// [2, 3],\n// [4, 5]]\n\n// Flatten a 2D 2x3 array to 1D 6-element array.\nvar flattened = reshape2x3.arrayReshape(ee.Image([-1]).toArray(), 1);\nprint('2D array flattened to 1D', sampArrImg(flattened));\n// [0, 1, 2, 3, 4, 5]\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# A function to print arrays for a selected pixel in the following examples.\ndef samp_arr_img(arr_img):\n point = ee.Geometry.Point([-121, 42])\n return arr_img.sample(point, 500).first().get('array')\n\n# Create a 1D array image with length 6.\narray_img_1d = ee.Image([0, 1, 2, 3, 4, 5]).toArray()\nprint('1D array image (pixel):', samp_arr_img(array_img_1d).getInfo())\n# [0, 1, 2, 3, 4, 5]\n\n# Reshape the 1D 6-element array to a 2D 2 (row) x 3 (column) array. Notice\n# that elements are filled row by row in the reshaped result.\nreshape2x3 = array_img_1d.arrayReshape(ee.Image([2, 3]).toArray(), 2)\nprint('2D 2x3 array image (pixel):', samp_arr_img(reshape2x3).getInfo())\n# [[0, 1, 2],\n# [3, 4, 5]]\n\n# Use -1 to auto-determine a dimension length. For example, here we set\n# 3 rows and let Earth Engine determine the number of columns needed.\nreshape3x_ = array_img_1d.arrayReshape(ee.Image([3, -1]).toArray(), 2)\nprint('2D 3x? array image (pixel):', samp_arr_img(reshape3x_).getInfo())\n# [[0, 1],\n# [2, 3],\n# [4, 5]]\n\n# Flatten a 2D 2x3 array to 1D 6-element array.\nflattened = reshape2x3.arrayReshape(ee.Image([-1]).toArray(), 1)\nprint('2D array flattened to 1D:', samp_arr_img(flattened).getInfo())\n# [0, 1, 2, 3, 4, 5]\n```"]]