ee.Array.cat

  • This method concatenates multiple arrays into a single array along a specified axis.

  • The arrays being concatenated must have the same dimensionality and the same length on all axes except the concatenation axis.

  • The arrays argument is a list of arrays to concatenate, and the optional axis argument is an integer specifying the axis for concatenation, defaulting to 0.

  • The method returns a single concatenated Array.

 Concatenates multiple arrays into a single array along the given axis. Each array must have the same dimensionality and the same length on all axes except the concatenation axis.

UsageReturns
ee.Array.cat(arrays, axis)Array
ArgumentTypeDetails
arraysListArrays to concatenate.
axisInteger, default: 0Axis to concatenate along.

Examples

Code Editor (JavaScript)

// Requires an explicit PixelType if no data.
var empty = ee.Array([], ee.PixelType.int8());  // Empty []
var one = ee.Array([1]);
var two = ee.Array([2]);

print(ee.Array.cat([empty]));  // []
print(ee.Array.cat([empty, empty]));  // []
print(ee.Array.cat([empty, one]));  // [1]
print(ee.Array.cat([one, empty]));  // [1]
print(ee.Array.cat([one, two]));  // [1, 2]

print(ee.Array.cat([one, two], 0));  // [1, 2]
print(ee.Array.cat([one, two], 1));  // [[1,2]]

var a = ee.Array([0, 1, 2]);
var b = ee.Array([3, 4, 5]);
print(ee.Array.cat([a, b]));  // [0,1,2,3,4,5]
print(ee.Array.cat([a, b], 0));  // [0,1,2,3,4,5]
print(ee.Array.cat([a, b], 1));  // [[0,3],[1,4],[2,5]]

var c = ee.Array([[0], [1], [2]]);
var d = ee.Array([[3], [4], [5]]);
print(ee.Array.cat([c, d]));  // [[0],[1],[2],[3],[4],[5]]
print(ee.Array.cat([c, d], 0));  // [[0],[1],[2],[3],[4],[5]]
print(ee.Array.cat([c, d], 1));  // [[0,3],[1,4],[2,5]]
print(ee.Array.cat([c, d], 2));  // [[[0,3]],[[1,4]],[[2,5]]]

var e = ee.Array([[[0, 1], [2, 3]], [[4, 5], [6, 7]]]);
var f = ee.Array([[[10, 11], [12, 13]], [[14, 15], [16, 17]]]);

// [[[0,1],[2,3]]
//  [[4,5],[6,7]]
//  [[10,11],[12,13]]
//  [[14,15],[16,17]]
print(ee.Array.cat([e, f], 0));

// [[[0,1],[2,3],[10,11],[12,13]]
//  [[4,5],[6,7],[14,15],[16,17]]]
print(ee.Array.cat([e, f], 1));

// [[[0,1,10,11],[2,3,12,13]]
//  [[4,5,14,15],[6,7,16,17]]]
print(ee.Array.cat([e, f], 2));

// [[[[0,10],[1,11]],[[2,12],[3,13]]]
//  [[[4,14],[5,15]],[[6,16],[7,17]]]]
print(ee.Array.cat([e, f], 3));

Python setup

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

import ee
import geemap.core as geemap

Colab (Python)

# Requires an explicit PixelType if no data.
empty = ee.Array([], ee.PixelType.int8())  # []
one = ee.Array([1])
two = ee.Array([2])

display(ee.Array.cat([empty]))  # []
display(ee.Array.cat([empty, empty]))  # []
display(ee.Array.cat([empty, one]))  # [1]
display(ee.Array.cat([one, empty]))  # [1]
display(ee.Array.cat([one, two]))  # [1, 2]

display(ee.Array.cat([one, two], 0))  # [1, 2]
display(ee.Array.cat([one, two], 1))  # [[1, 2]]

a = ee.Array([0, 1, 2])
b = ee.Array([3, 4, 5])
display(ee.Array.cat([a, b]))  # [0, 1, 2, 3, 4, 5]
display(ee.Array.cat([a, b], 0))  # [0, 1, 2, 3, 4, 5]
display(ee.Array.cat([a, b], 1))  # [[0, 3], [1, 4], [2, 5]]

c = ee.Array([[0], [1], [2]])
d = ee.Array([[3], [4], [5]])
display(ee.Array.cat([c, d]))  # [[0], [1], [2], [3], [4], [5]]
display(ee.Array.cat([c, d], 0))  # [[0], [1], [2], [3], [4], [5]]
display(ee.Array.cat([c, d], 1))  # [[0, 3], [1, 4], [2, 5]]
display(ee.Array.cat([c, d], 2))  # [[[0, 3]], [[1, 4]], [[2, 5]]]

e = ee.Array([[[0, 1], [2, 3]], [[4, 5], [6, 7]]])
f = ee.Array([[[10, 11], [12, 13]], [[14, 15], [16, 17]]])

# [[[0, 1], [2, 3]]
#  [[4, 5], [6, 7]]
#  [[10, 11], [12, 13]]
#  [[14, 15], [16, 17]]
display(ee.Array.cat([e, f], 0))

# [[[0, 1], [2, 3], [10, 11], [12, 13]]
#  [[4, 5], [6, 7], [14, 15], [16, 17]]]
display(ee.Array.cat([e, f], 1))

# [[[0, 1, 10, 11], [2, 3, 12, 13]]
#  [[4, 5, 14, 15], [6, 7, 16, 17]]]
display(ee.Array.cat([e, f], 2))

# [[[[0, 10], [1, 11]], [[2, 12], [3, 13]]]
#  [[[4, 14], [5, 15]], [[6, 16], [7, 17]]]]
display(ee.Array.cat([e, f], 3))