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ee.Image.arrayDotProduct
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Calcola il prodotto scalare di ogni coppia di array unidimensionali nelle bande delle immagini di input.
Utilizzo | Resi |
---|
Image.arrayDotProduct(image2) | Immagine |
Argomento | Tipo | Dettagli |
---|
questo: image1 | Immagine | Prima immagine dell'array di vettori unidimensionali. |
image2 | Immagine | Seconda immagine dell'array di vettori 1D. |
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');
}
// A 1D array image.
var arrayImg1Da = ee.Image([0, 1, 2]).toArray();
print('1D array image A (pixel)', sampArrImg(arrayImg1Da));
// [0, 1, 2]
// A second 1D array image of the same length.
var arrayImg1Db = ee.Image([3, 4, 5]).toArray();
print('1D array image B (pixel)', sampArrImg(arrayImg1Db));
// [3, 4, 5]
// Calculate the dot product for the two 1D arrays.
var test = arrayImg1Da.arrayDotProduct(arrayImg1Db);
print('A⋅B = 0(3) + 1(4) + 2(5) = ', sampArrImg(test));
// 14
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')
# A 1D array image.
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]
# A second 1D array image of the same length.
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]
# Calculate the dot product for the two 1D arrays.
test = array_img_1d_a.arrayDotProduct(array_img_1d_b)
print('A⋅B = 0(3) + 1(4) + 2(5) = ', samp_arr_img(test).getInfo())
# 14
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
Ultimo aggiornamento 2025-07-26 UTC.
[null,null,["Ultimo aggiornamento 2025-07-26 UTC."],[[["\u003cp\u003eComputes the dot product of corresponding 1-D arrays within two input images, resulting in a new image.\u003c/p\u003e\n"],["\u003cp\u003eEach 1-D array represents a band in the input images, and they must have the same length.\u003c/p\u003e\n"],["\u003cp\u003eThe dot product calculation is performed element-wise between the arrays in matching bands.\u003c/p\u003e\n"],["\u003cp\u003eThe resulting image contains a single band representing the dot product values for each pixel location.\u003c/p\u003e\n"]]],["The `arrayDotProduct` function computes the dot product between two 1-D array images. It takes two image arguments, `image1` and `image2`, representing the first and second array images respectively. The dot product is calculated for each corresponding pair of 1-D arrays in the images' bands. The result is an `Image` representing the dot product. The example illustrates this using arrays [0, 1, 2] and [3, 4, 5], yielding a dot product of 14.\n"],null,["# ee.Image.arrayDotProduct\n\nComputes the dot product of each pair of 1-D arrays in the bands of the input images.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|---------------------------------|---------|\n| Image.arrayDotProduct`(image2)` | Image |\n\n| Argument | Type | Details |\n|----------------|-------|------------------------------------|\n| this: `image1` | Image | First array image of 1-D vectors. |\n| `image2` | Image | Second array image of 1-D vectors. |\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// A 1D array image.\nvar arrayImg1Da = ee.Image([0, 1, 2]).toArray();\nprint('1D array image A (pixel)', sampArrImg(arrayImg1Da));\n// [0, 1, 2]\n\n// A second 1D array image of the same length.\nvar arrayImg1Db = ee.Image([3, 4, 5]).toArray();\nprint('1D array image B (pixel)', sampArrImg(arrayImg1Db));\n// [3, 4, 5]\n\n// Calculate the dot product for the two 1D arrays.\nvar test = arrayImg1Da.arrayDotProduct(arrayImg1Db);\nprint('A⋅B = 0(3) + 1(4) + 2(5) = ', sampArrImg(test));\n// 14\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# A 1D array image.\narray_img_1d_a = ee.Image([0, 1, 2]).toArray()\nprint('1D array image A (pixel):', samp_arr_img(array_img_1d_a).getInfo())\n# [0, 1, 2]\n\n# A second 1D array image of the same length.\narray_img_1d_b = ee.Image([3, 4, 5]).toArray()\nprint('1D array image B (pixel):', samp_arr_img(array_img_1d_b).getInfo())\n# [3, 4, 5]\n\n# Calculate the dot product for the two 1D arrays.\ntest = array_img_1d_a.arrayDotProduct(array_img_1d_b)\nprint('A⋅B = 0(3) + 1(4) + 2(5) = ', samp_arr_img(test).getInfo())\n# 14\n```"]]