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ee.Number.atan2
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Calculates the angle formed by the 2D vector [x, y].
| Usage | Returns | Number.atan2(right) | Number |
| Argument | Type | Details | this: left | Number | The left-hand value. |
right | Number | The right-hand value. |
Examples
Code Editor (JavaScript)
// Left input is x and right input is y, representing point (x,y).
print('Atan2 of point (0,0)', ee.Number(0).atan2(0)); // 0
print('Atan2 of point (1,0)', ee.Number(1).atan2(0)); // 0
print('Atan2 of point (0,1)', ee.Number(0).atan2(1)); // 1.570796326 (π/2)
print('Atan2 of point (-1,0)', ee.Number(-1).atan2(0)); // 3.141592653 (π)
print('Atan2 of point (0,-1)', ee.Number(0).atan2(-1)); // -1.570796326 (-π/2)
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)
print('Atan2 of point (0,0):', ee.Number(0).atan2(0).getInfo()) # 0
print('Atan2 of point (1,0):', ee.Number(1).atan2(0).getInfo()) # 0
# 1.570796326 (π/2)
print('Atan2 of point (0,1):', ee.Number(0).atan2(1).getInfo())
# 3.141592653 (π)
print('Atan2 of point (-1,0):', ee.Number(-1).atan2(0).getInfo())
# -1.570796326 (-π/2)
print('Atan2 of point (0,-1):', ee.Number(0).atan2(-1).getInfo())
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Last updated 2023-10-06 UTC.
[null,null,["Last updated 2023-10-06 UTC."],[[["\u003cp\u003e\u003ccode\u003eatan2()\u003c/code\u003e calculates the angle formed by a 2D vector represented by its x and y coordinates (left and right inputs respectively).\u003c/p\u003e\n"],["\u003cp\u003eIt returns the angle in radians, ranging from -π to π.\u003c/p\u003e\n"],["\u003cp\u003eThe function is accessed using \u003ccode\u003eee.Number(left).atan2(right)\u003c/code\u003e, where \u003ccode\u003eleft\u003c/code\u003e represents the x-coordinate and \u003ccode\u003eright\u003c/code\u003e represents the y-coordinate.\u003c/p\u003e\n"],["\u003cp\u003eExamples demonstrate how \u003ccode\u003eatan2()\u003c/code\u003e is used to find angles for various points in a 2D plane.\u003c/p\u003e\n"]]],["The `atan2` function calculates the angle of a 2D vector [x, y]. It takes two numeric inputs: `left` as x and `right` as y. The function returns a number representing the angle. For example, `atan2(1, 0)` represents the point (1,0) returning an angle of 0. The point (0,1) `atan2(0,1)` returns an angle of π/2. `atan2(-1,0)` returns π, and `atan2(0,-1)` returns -π/2.\n"],null,["# ee.Number.atan2\n\nCalculates the angle formed by the 2D vector \\[x, y\\].\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------|---------|\n| Number.atan2`(right)` | Number |\n\n| Argument | Type | Details |\n|--------------|--------|-----------------------|\n| this: `left` | Number | The left-hand value. |\n| `right` | Number | The right-hand value. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Left input is x and right input is y, representing point (x,y).\nprint('Atan2 of point (0,0)', ee.Number(0).atan2(0)); // 0\nprint('Atan2 of point (1,0)', ee.Number(1).atan2(0)); // 0\nprint('Atan2 of point (0,1)', ee.Number(0).atan2(1)); // 1.570796326 (π/2)\nprint('Atan2 of point (-1,0)', ee.Number(-1).atan2(0)); // 3.141592653 (π)\nprint('Atan2 of point (0,-1)', ee.Number(0).atan2(-1)); // -1.570796326 (-π/2)\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\nprint('Atan2 of point (0,0):', ee.Number(0).atan2(0).getInfo()) # 0\nprint('Atan2 of point (1,0):', ee.Number(1).atan2(0).getInfo()) # 0\n# 1.570796326 (π/2)\nprint('Atan2 of point (0,1):', ee.Number(0).atan2(1).getInfo())\n# 3.141592653 (π)\nprint('Atan2 of point (-1,0):', ee.Number(-1).atan2(0).getInfo())\n# -1.570796326 (-π/2)\nprint('Atan2 of point (0,-1):', ee.Number(0).atan2(-1).getInfo())\n```"]]