Pengumuman: Semua project nonkomersial yang terdaftar untuk menggunakan Earth Engine sebelum
15 April 2025 harus
memverifikasi kelayakan nonkomersial untuk mempertahankan akses Earth Engine.
ee.Geometry.Polygon.convexHull
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Menampilkan hull cembung dari geometri yang diberikan. Convex hull dari satu titik adalah titik itu sendiri, convex hull dari titik-titik kolinear adalah garis, dan convex hull dari yang lainnya adalah poligon. Perhatikan bahwa poligon degenerasi dengan semua verteks pada garis yang sama akan menghasilkan segmen garis.
Penggunaan | Hasil |
---|
Polygon.convexHull(maxError, proj) | Geometri |
Argumen | Jenis | Detail |
---|
ini: geometry | Geometri | Menghitung hull cembung geometri ini. |
maxError | ErrorMargin, default: null | Jumlah maksimum error yang dapat ditoleransi saat melakukan reproyeksi yang diperlukan. |
proj | Proyeksi, default: null | Proyeksi tempat operasi akan dilakukan. Jika tidak ditentukan, operasi akan dilakukan dalam sistem koordinat bola, dan jarak linear akan dalam meter di bola. |
Contoh
Code Editor (JavaScript)
// Define a Polygon object.
var polygon = ee.Geometry.Polygon(
[[[-122.092, 37.424],
[-122.086, 37.418],
[-122.079, 37.425],
[-122.085, 37.423]]]);
// Apply the convexHull method to the Polygon object.
var polygonConvexHull = polygon.convexHull({'maxError': 1});
// Print the result to the console.
print('polygon.convexHull(...) =', polygonConvexHull);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(polygon,
{'color': 'black'},
'Geometry [black]: polygon');
Map.addLayer(polygonConvexHull,
{'color': 'red'},
'Result [red]: polygon.convexHull');
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)
# Define a Polygon object.
polygon = ee.Geometry.Polygon([[
[-122.092, 37.424],
[-122.086, 37.418],
[-122.079, 37.425],
[-122.085, 37.423],
]])
# Apply the convexHull method to the Polygon object.
polygon_convex_hull = polygon.convexHull(maxError=1)
# Print the result.
display('polygon.convexHull(...) =', polygon_convex_hull)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(polygon, {'color': 'black'}, 'Geometry [black]: polygon')
m.add_layer(
polygon_convex_hull, {'color': 'red'}, 'Result [red]: polygon.convexHull'
)
m
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 2025-07-26 UTC.
[null,null,["Terakhir diperbarui pada 2025-07-26 UTC."],[[["\u003cp\u003eReturns the smallest convex Polygon that encloses the given geometry.\u003c/p\u003e\n"],["\u003cp\u003eAccepts an optional \u003ccode\u003emaxError\u003c/code\u003e for reprojection and an optional \u003ccode\u003eproj\u003c/code\u003e for the projection to use.\u003c/p\u003e\n"],["\u003cp\u003eThe convex hull of a point is the point itself, collinear points result in a line, and other geometries result in a Polygon.\u003c/p\u003e\n"],["\u003cp\u003eMay return a degenerate polygon (line segment) if all vertices lie on the same line.\u003c/p\u003e\n"]]],[],null,["# ee.Geometry.Polygon.convexHull\n\nReturns the convex hull of the given geometry. The convex hull of a single point is the point itself, the convex hull of collinear points is a line, and the convex hull of everything else is a polygon. Note that a degenerate polygon with all vertices on the same line will result in a line segment.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------------|----------|\n| Polygon.convexHull`(`*maxError* `, `*proj*`)` | Geometry |\n\n| Argument | Type | Details |\n|------------------|----------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | Calculates the convex hull of this geometry. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |\n| `proj` | Projection, default: null | The projection in which to perform the operation. If not specified, the operation will be performed in a spherical coordinate system, and linear distances will be in meters on the sphere. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Define a Polygon object.\nvar polygon = ee.Geometry.Polygon(\n [[[-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423]]]);\n\n// Apply the convexHull method to the Polygon object.\nvar polygonConvexHull = polygon.convexHull({'maxError': 1});\n\n// Print the result to the console.\nprint('polygon.convexHull(...) =', polygonConvexHull);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(polygon,\n {'color': 'black'},\n 'Geometry [black]: polygon');\nMap.addLayer(polygonConvexHull,\n {'color': 'red'},\n 'Result [red]: polygon.convexHull');\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# Define a Polygon object.\npolygon = ee.Geometry.Polygon([[\n [-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423],\n]])\n\n# Apply the convexHull method to the Polygon object.\npolygon_convex_hull = polygon.convexHull(maxError=1)\n\n# Print the result.\ndisplay('polygon.convexHull(...) =', polygon_convex_hull)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(polygon, {'color': 'black'}, 'Geometry [black]: polygon')\nm.add_layer(\n polygon_convex_hull, {'color': 'red'}, 'Result [red]: polygon.convexHull'\n)\nm\n```"]]