Pengumuman: Semua project nonkomersial yang terdaftar untuk menggunakan Earth Engine sebelum
15 April 2025 harus
memverifikasi kelayakan nonkomersial untuk mempertahankan akses Earth Engine.
ee.Kernel.compass
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Membuat kernel deteksi tepi Kompas Prewitt 3x3.
| Penggunaan | Hasil |
|---|
ee.Kernel.compass(magnitude, normalize) | Kernel |
| Argumen | Jenis | Detail |
|---|
magnitude | Float, default: 1 | Menskalakan setiap nilai dengan jumlah ini. |
normalize | Boolean, default: false | Menormalisasi nilai kernel agar berjumlah 1. |
Contoh
Code Editor (JavaScript)
print('A Prewitt compass kernel', ee.Kernel.compass());
/**
* Output weights matrix
*
* [1, 1, -1]
* [1, -2, -1]
* [1, 1, -1]
*/
Penyiapan Python
Lihat halaman
Lingkungan Python untuk mengetahui informasi tentang Python API dan penggunaan
geemap untuk pengembangan interaktif.
import ee
import geemap.core as geemap
Colab (Python)
from pprint import pprint
print('A Prewitt compass kernel:')
pprint(ee.Kernel.compass().getInfo())
# Output weights matrix
# [1, 1, -1]
# [1, -2, -1]
# [1, 1, -1]
Kecuali dinyatakan lain, konten di halaman ini dilisensikan berdasarkan Lisensi Creative Commons Attribution 4.0, sedangkan contoh kode dilisensikan berdasarkan Lisensi Apache 2.0. Untuk mengetahui informasi selengkapnya, lihat Kebijakan Situs Google Developers. Java adalah merek dagang terdaftar dari Oracle dan/atau afiliasinya.
Terakhir diperbarui pada 2025-07-27 UTC.
[null,null,["Terakhir diperbarui pada 2025-07-27 UTC."],[[["\u003cp\u003eCreates a 3x3 Prewitt's Compass kernel for edge detection in images.\u003c/p\u003e\n"],["\u003cp\u003eAllows for customization by scaling the kernel values with a magnitude argument.\u003c/p\u003e\n"],["\u003cp\u003eOffers an option to normalize the kernel values, ensuring they sum to 1.\u003c/p\u003e\n"],["\u003cp\u003eProvides usage examples in JavaScript, Python, and Colab environments.\u003c/p\u003e\n"]]],["The core function is `ee.Kernel.compass()`, which creates a 3x3 Prewitt compass edge-detection kernel. The function accepts two arguments: `magnitude` (a float to scale values, defaulting to 1) and `normalize` (a boolean to normalize the kernel values to sum to 1, defaulting to false). The output is a kernel with weights represented as `[[1, 1, -1], [1, -2, -1], [1, 1, -1]]`.\n"],null,["# ee.Kernel.compass\n\nGenerates a 3x3 Prewitt's Compass edge-detection kernel.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|----------------------------------------------------|---------|\n| `ee.Kernel.compass(`*magnitude* `, `*normalize*`)` | Kernel |\n\n| Argument | Type | Details |\n|-------------|-------------------------|------------------------------------------|\n| `magnitude` | Float, default: 1 | Scale each value by this amount. |\n| `normalize` | Boolean, default: false | Normalize the kernel values to sum to 1. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\nprint('A Prewitt compass kernel', ee.Kernel.compass());\n\n/**\n * Output weights matrix\n *\n * [1, 1, -1]\n * [1, -2, -1]\n * [1, 1, -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\nprint('A Prewitt compass kernel:')\npprint(ee.Kernel.compass().getInfo())\n\n# Output weights matrix\n\n# [1, 1, -1]\n# [1, -2, -1]\n# [1, 1, -1]\n```"]]
