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ee.Number.cos
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计算以弧度表示的输入的余弦值。
示例
代码编辑器 (JavaScript)
// Input angle in radians.
print('Cosine of 0', ee.Number(0).cos()); // 1
print('Cosine of π/2', ee.Number(Math.PI/2).cos()); // 0 (nearly)
print('Cosine of π', ee.Number(Math.PI).cos()); // -1
// Convert degrees to radians.
var degrees = 45;
var radians = degrees * (Math.PI/180);
print('Cosine of 45 degrees', ee.Number(radians).cos()); // 0.707106781
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)
import math
# Input angle in radians.
print('Cosine of 0:', ee.Number(0).cos().getInfo()) # 1
print('Cosine of π/2:', ee.Number(math.pi/2).cos().getInfo()) # 0 (nearly)
print('Cosine of π:', ee.Number(math.pi).cos().getInfo()) # -1
# Convert degrees to radians.
degrees = 45
radians = degrees * (math.pi/180)
# 0.707106781
print('Cosine of 45 degrees:', ee.Number(radians).cos().getInfo())
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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\u003eThis function calculates the cosine of a given input value in radians, returning the result as a number.\u003c/p\u003e\n"],["\u003cp\u003eIt accepts a single argument, the input value, which should be a number representing the angle in radians.\u003c/p\u003e\n"],["\u003cp\u003eExamples demonstrate its usage in JavaScript and Python, including converting degrees to radians for input.\u003c/p\u003e\n"],["\u003cp\u003eThe function is accessible within Earth Engine code editor, Python, and Colab environments.\u003c/p\u003e\n"]]],["The `cos()` method computes the cosine of a numerical input, which must be in radians. It returns a numerical value representing the cosine. Input angles can be provided directly in radians or converted from degrees using the formula: `degrees * (π/180)`. The provided examples illustrate using `cos()` with values like 0, π/2, and π, and demonstrates calculating the cosine of 45 degrees after converting it to radians.\n"],null,["# ee.Number.cos\n\nComputes the cosine of the input in radians.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|----------------|---------|\n| Number.cos`()` | 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// Input angle in radians.\nprint('Cosine of 0', ee.Number(0).cos()); // 1\nprint('Cosine of π/2', ee.Number(Math.PI/2).cos()); // 0 (nearly)\nprint('Cosine of π', ee.Number(Math.PI).cos()); // -1\n\n// Convert degrees to radians.\nvar degrees = 45;\nvar radians = degrees * (Math.PI/180);\nprint('Cosine of 45 degrees', ee.Number(radians).cos()); // 0.707106781\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\nimport math\n\n# Input angle in radians.\nprint('Cosine of 0:', ee.Number(0).cos().getInfo()) # 1\nprint('Cosine of π/2:', ee.Number(math.pi/2).cos().getInfo()) # 0 (nearly)\nprint('Cosine of π:', ee.Number(math.pi).cos().getInfo()) # -1\n\n# Convert degrees to radians.\ndegrees = 45\nradians = degrees * (math.pi/180)\n# 0.707106781\nprint('Cosine of 45 degrees:', ee.Number(radians).cos().getInfo())\n```"]]
