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ee.Number.asin
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计算输入的反正弦（以弧度为单位）。
示例
代码编辑器 (JavaScript)
// The domain of arcsine is [-1,1], inputs outside the domain are invalid.
print('Arcsine of -1', ee.Number(-1).asin()); // -1.570796326 (-π/2)
print('Arcsine of 0', ee.Number(0).asin()); // 0
print('Arcsine of 1', ee.Number(1).asin()); // 1.570796326 (π/2)
Python 设置
如需了解 Python API 和如何使用 geemap 进行交互式开发，请参阅
Python 环境页面。
import ee
import geemap.core as geemap
Colab (Python)
# The domain of arcsine is [-1,1], inputs outside the domain are invalid.
print('Arcsine of -1:', ee.Number(-1).asin().getInfo()) # -1.570796326 (-π/2)
print('Arcsine of 0:', ee.Number(0).asin().getInfo()) # 0
print('Arcsine of 1:', ee.Number(1).asin().getInfo()) # 1.570796326 (π/2)
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最后更新时间 (UTC)：2025-07-26。
[null,null,["最后更新时间 (UTC)：2025-07-26。"],[[["\u003cp\u003eComputes the arcsine (inverse sine) of a given input number in radians.\u003c/p\u003e\n"],["\u003cp\u003eThe input value must be within the range of -1 to 1, inclusive.\u003c/p\u003e\n"],["\u003cp\u003eReturns a number representing the angle (in radians) whose sine is the input value.\u003c/p\u003e\n"],["\u003cp\u003eValues outside the valid input domain are considered invalid.\u003c/p\u003e\n"]]],["The `asin()` function computes the arcsine of a numerical input, returning the result in radians. The input must be within the domain of [-1, 1]; otherwise, it's invalid. The function is applied to a number object (`ee.Number` in both JavaScript and Python). For example, `ee.Number(-1).asin()` returns approximately -1.570796326 (-π/2), `ee.Number(0).asin()` returns 0, and `ee.Number(1).asin()` returns approximately 1.570796326 (π/2).\n"],null,["# ee.Number.asin\n\nComputes the arcsine in radians of the input.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------|---------|\n| Number.asin`()` | Number |\n\n| Argument | Type | Details |\n|---------------|--------|------------------|\n| this: `input` | Number | The input value. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// The domain of arcsine is [-1,1], inputs outside the domain are invalid.\nprint('Arcsine of -1', ee.Number(-1).asin()); // -1.570796326 (-π/2)\nprint('Arcsine of 0', ee.Number(0).asin()); // 0\nprint('Arcsine of 1', ee.Number(1).asin()); // 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\n# The domain of arcsine is [-1,1], inputs outside the domain are invalid.\nprint('Arcsine of -1:', ee.Number(-1).asin().getInfo()) # -1.570796326 (-π/2)\nprint('Arcsine of 0:', ee.Number(0).asin().getInfo()) # 0\nprint('Arcsine of 1:', ee.Number(1).asin().getInfo()) # 1.570796326 (π/2)\n```"]]
