ee.Image.arrayReshape

Mengonversi band array gambar dengan piksel berbentuk sama, yang mungkin multidimensi, menjadi gambar array dengan bentuk baru.

Penggunaan	Hasil
Image.arrayReshape(lengths, dimensions)	Gambar

Argumen	Jenis	Detail
this: image	Gambar	Gambar array yang akan diubah bentuknya.
lengths	Gambar	Gambar 1-band yang menentukan panjang baru setiap sumbu gambar input yang ditentukan sebagai array 1-D per piksel. Harus ada nilai panjang 'dimensi' di setiap array 'bentuk'. Jika salah satu panjangnya adalah -1, panjang yang sesuai untuk sumbu tersebut akan dihitung sehingga ukuran total tetap konstan. Secara khusus, bentuk [-1] diratakan menjadi 1-D. Maksimal satu komponen bentuk dapat berupa -1.
dimensions	Bilangan bulat	Jumlah dimensi yang dibagikan oleh semua piksel array output.

Contoh

Editor Kode (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]

Penyiapan Python

Baca halaman Lingkungan Python untuk mengetahui informasi tentang Python API dan penggunaan geemap untuk pengembangan interaktif.

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()
display('1D array image (pixel):', samp_arr_img(array_img_1d))
# [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)
display('2D 2x3 array image (pixel):', samp_arr_img(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.
reshape3x_ = array_img_1d.arrayReshape(ee.Image([3, -1]).toArray(), 2)
display('2D 3x? array image (pixel):', samp_arr_img(reshape3x_))
# [[0, 1],
#  [2, 3],
#  [4, 5]]

# Flatten a 2D 2x3 array to 1D 6-element array.
flattened = reshape2x3.arrayReshape(ee.Image([-1]).toArray(), 1)
display('2D array flattened to 1D:', samp_arr_img(flattened))
# [0, 1, 2, 3, 4, 5]