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ee.Kernel.rotate
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建立核心。
用量 | 傳回 |
---|
Kernel.rotate(rotations) | 核心 |
引數 | 類型 | 詳細資料 |
---|
這個:kernel | 核心 | 要輪替的核心。 |
rotations | 整數 | 要旋轉 90 度的次數。負數會逆時針旋轉。 |
範例
程式碼編輯器 (JavaScript)
// A kernel to be rotated.
var sobelKernel = ee.Kernel.sobel();
print(sobelKernel);
/**
* Output weights matrix
*
* [-1, 0, 1]
* [-2, 0, 2]
* [-1, 0, 1]
*/
print('One 90 degree clockwise rotation', sobelKernel.rotate(1));
/**
* [-1, -2, -1]
* [ 0, 0, 0]
* [ 1, 2, 1]
*/
print('Two 90 degree counterclockwise rotations', sobelKernel.rotate(-2));
/**
* [1, 0, -1]
* [2, 0, -2]
* [1, 0, -1]
*/
Python 設定
請參閱
Python 環境頁面,瞭解 Python API 和如何使用 geemap
進行互動式開發。
import ee
import geemap.core as geemap
Colab (Python)
from pprint import pprint
# A kernel to be rotated.
sobel_kernel = ee.Kernel.sobel()
pprint(sobel_kernel.getInfo())
# Output weights matrix
# [-1, 0, 1]
# [-2, 0, 2]
# [-1, 0, 1]
print('One 90 degree clockwise rotation:')
pprint(sobel_kernel.rotate(1).getInfo())
# [-1, -2, -1]
# [ 0, 0, 0]
# [ 1, 2, 1]
print('Two 90 degree counterclockwise rotations:')
pprint(sobel_kernel.rotate(-2).getInfo())
# [1, 0, -1]
# [2, 0, -2]
# [1, 0, -1]
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上次更新時間:2025-07-26 (世界標準時間)。
[null,null,["上次更新時間:2025-07-26 (世界標準時間)。"],[[["\u003cp\u003e\u003ccode\u003erotate()\u003c/code\u003e is a method applied to a Kernel object to rotate its weights matrix by a specified number of 90-degree turns.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003erotations\u003c/code\u003e argument accepts an integer, with positive values indicating clockwise rotations and negative values indicating counterclockwise rotations.\u003c/p\u003e\n"],["\u003cp\u003eRotating a kernel changes the direction in which the kernel is applied, impacting the output of image processing operations.\u003c/p\u003e\n"],["\u003cp\u003eThe examples provided demonstrate how to rotate a Sobel kernel by 90 degrees clockwise, and by 180 degrees (two 90-degree turns counterclockwise).\u003c/p\u003e\n"]]],[],null,["# ee.Kernel.rotate\n\nCreates a Kernel.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|----------------------------|---------|\n| Kernel.rotate`(rotations)` | Kernel |\n\n| Argument | Type | Details |\n|----------------|---------|----------------------------------------------------------------------------------|\n| this: `kernel` | Kernel | The kernel to be rotated. |\n| `rotations` | Integer | Number of 90 degree rotations to make. Negative numbers rotate counterclockwise. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// A kernel to be rotated.\nvar sobelKernel = ee.Kernel.sobel();\nprint(sobelKernel);\n\n/**\n * Output weights matrix\n *\n * [-1, 0, 1]\n * [-2, 0, 2]\n * [-1, 0, 1]\n */\n\nprint('One 90 degree clockwise rotation', sobelKernel.rotate(1));\n\n/**\n * [-1, -2, -1]\n * [ 0, 0, 0]\n * [ 1, 2, 1]\n */\n\nprint('Two 90 degree counterclockwise rotations', sobelKernel.rotate(-2));\n\n/**\n * [1, 0, -1]\n * [2, 0, -2]\n * [1, 0, -1]\n */\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\nfrom pprint import pprint\n\n# A kernel to be rotated.\nsobel_kernel = ee.Kernel.sobel()\npprint(sobel_kernel.getInfo())\n\n# Output weights matrix\n\n# [-1, 0, 1]\n# [-2, 0, 2]\n# [-1, 0, 1]\n\nprint('One 90 degree clockwise rotation:')\npprint(sobel_kernel.rotate(1).getInfo())\n\n# [-1, -2, -1]\n# [ 0, 0, 0]\n# [ 1, 2, 1]\n\nprint('Two 90 degree counterclockwise rotations:')\npprint(sobel_kernel.rotate(-2).getInfo())\n\n# [1, 0, -1]\n# [2, 0, -2]\n# [1, 0, -1]\n```"]]