ee.Image.arrayArgmax

Berechnet die Positionsindexe des Maximalwerts im Bild der Arraywerte. Wenn das Maximum mehrmals vorkommt, beziehen sich die Indexwerte auf das erste Vorkommen.

Nutzung	Ausgabe
Image.arrayArgmax()	Bild

Argument	Typ	Details
So gehts: image	Bild	Das Eingabebild.

Beispiele

Code-Editor (JavaScript)

// A function to print the array 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.
var arrayImg1D = ee.Image([0, 1, 5, 2, 3, 4]).toArray();
print('1D array image (pixel)', sampArrImg(arrayImg1D));
// [0, 1, 5, 2, 3, 4]

// Get the position of the maximum value in a 1D array.
var maxValue1D = arrayImg1D.arrayArgmax();
print('Position of the maximum 1D array value', sampArrImg(maxValue1D));
// [2]

// Create a 2D 2x3 array image (reshape the 1D array image).
var arrayImg2D = arrayImg1D.arrayReshape(ee.Image([2, 3]).toArray(), 2);
print('2D 2x3 array image (pixel)', sampArrImg(arrayImg2D));
// [[0, 1, 5],
//  [2, 3, 4]]

// Get the position of the maximum value in a 2D array.
var maxValue2D = arrayImg2D.arrayArgmax();
print('Position of the maximum 2D array value', sampArrImg(maxValue2D));
// [0, 2]

Python einrichten

Informationen zur Python API und zur Verwendung von geemap für die interaktive Entwicklung finden Sie auf der Seite Python-Umgebung.

import ee
import geemap.core as geemap

Colab (Python)

# A function to print the array 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.
array_img_1d = ee.Image([0, 1, 5, 2, 3, 4]).toArray()
print('1D array image (pixel):', samp_arr_img(array_img_1d).getInfo())
# [0, 1, 5, 2, 3, 4]

# Get the position of the maximum value in a 1D array.
max_value_1d = array_img_1d.arrayArgmax()
print(
    'Position of the maximum 1D array value:',
    samp_arr_img(max_value_1d).getInfo()
    )
# [2]

# Create a 2D 2x3 array image (reshape the 1D array image).
array_img_2d = array_img_1d.arrayReshape(ee.Image([2, 3]).toArray(), 2)
print('2D 2x3 array image (pixel):', samp_arr_img(array_img_2d).getInfo())
# [[0, 1, 5],
#  [2, 3, 4]]

# Get the position of the maximum value in a 2D array.
max_value_2d = array_img_2d.arrayArgmax()
print(
    'Position of the maximum 2D array value:',
    samp_arr_img(max_value_2d).getInfo()
)
# [0, 2]