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ee.Image.arrayLength

  • Image.arrayLength(axis) returns the length of each pixel's array along the specified axis.

 Returns the length of each pixel's array along the given axis.

UsageReturns
Image.arrayLength(axis)Image
ArgumentTypeDetails
this:inputImageInput image.
axisIntegerThe axis along which to take the length.

Examples

Code Editor (JavaScript)

// A function to print arrays for a selected pixel in the following examples.functionsampArrImg(arrImg){varpoint=ee.Geometry.Point([-121,42]);returnarrImg.sample(point,500).first().get('array');}// A 3-band image of constants.varimg=ee.Image([0,1,2]);print('3-band image',img);// Convert the 3-band image to a 2D array image.vararrayImg2D=img.toArray().toArray(1);print('2D array image (pixel)',sampArrImg(arrayImg2D));// [[0],//  [1],//  [2]]// Get the number of dimensions in each pixel's array.vararrayImg2Ddim=arrayImg2D.arrayDimensions();print('N dimensions in array',sampArrImg(arrayImg2Ddim));// 2// Get the array length per dimension per pixel.vararrayImg2DdimLen=arrayImg2D.arrayLengths();print('Array length per dimension',sampArrImg(arrayImg2DdimLen));// [3, 1]// Get the array length for 0-axis (rows).vararrayImg2Daxis0Len=arrayImg2D.arrayLength(0);print('Array length 0-axis (rows)',sampArrImg(arrayImg2Daxis0Len));// 3// Get the array length for 1-axis (columns).vararrayImg2Daxis1Len=arrayImg2D.arrayLength(1);print('Array length 1-axis (columns)',sampArrImg(arrayImg2Daxis1Len));// 1

Python setup

See the Python Environment page for information on the Python API and usinggeemap for interactive development.

importeeimportgeemap.coreasgeemap

Colab (Python)

# A function to print arrays for a selected pixel in the following examples.defsamp_arr_img(arr_img):point=ee.Geometry.Point([-121,42])returnarr_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 a 2D array image.array_img_2d=img.toArray().toArray(1)display('2D array image (pixel):',samp_arr_img(array_img_2d))# [[0],#  [1],#  [2]]# Get the number of dimensions in each pixel's array.array_img2d_dim=array_img_2d.arrayDimensions()display('N dimensions in array:',samp_arr_img(array_img2d_dim))# 2# Get the array length per dimension per pixel.array_img_2d_dim_len=array_img_2d.arrayLengths()display('Array length per dimension:',samp_arr_img(array_img_2d_dim_len))# [3, 1]# Get the array length for 0-axis (rows).array_img2d_axis0_len=array_img_2d.arrayLength(0)display('Array length 0-axis (rows):',samp_arr_img(array_img2d_axis0_len))# 3# Get the array length for 1-axis (columns).array_img_2d_axis1_len=array_img_2d.arrayLength(1)display('Array length 1-axis (columns):',samp_arr_img(array_img_2d_axis1_len))# 1

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Last updated 2023-10-06 UTC.