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ee.Geometry.LinearRing.perimeter
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
傳回幾何圖形多邊形部分的周長。多重幾何圖形的周長是其元件周長的總和。
用量 | 傳回 |
---|
LinearRing.perimeter(maxError, proj) | 浮點值 |
引數 | 類型 | 詳細資料 |
---|
這個:geometry | 幾何圖形 | 輸入幾何圖形。 |
maxError | ErrorMargin,預設值:null | 執行任何必要重投影時可容許的最大誤差量。 |
proj | 投影,預設值:null | 如果指定,結果會以這個投影的座標系統單位表示。否則單位為公尺。 |
範例
程式碼編輯器 (JavaScript)
// Define a LinearRing object.
var linearRing = ee.Geometry.LinearRing(
[[-122.091, 37.420],
[-122.085, 37.422],
[-122.080, 37.430]]);
// Apply the perimeter method to the LinearRing object.
var linearRingPerimeter = linearRing.perimeter({'maxError': 1});
// Print the result to the console.
print('linearRing.perimeter(...) =', linearRingPerimeter);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(linearRing,
{'color': 'black'},
'Geometry [black]: linearRing');
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)
# Define a LinearRing object.
linearring = ee.Geometry.LinearRing(
[[-122.091, 37.420], [-122.085, 37.422], [-122.080, 37.430]]
)
# Apply the perimeter method to the LinearRing object.
linearring_perimeter = linearring.perimeter(maxError=1)
# Print the result.
display('linearring.perimeter(...) =', linearring_perimeter)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(linearring, {'color': 'black'}, 'Geometry [black]: linearring')
m
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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\u003eCalculates the total length of all sides (perimeter) for the polygonal parts of a geometry.\u003c/p\u003e\n"],["\u003cp\u003eWorks with multi-geometries by summing the perimeters of their individual components.\u003c/p\u003e\n"],["\u003cp\u003eReturns the perimeter value in meters by default, or in the units of a specified projection.\u003c/p\u003e\n"],["\u003cp\u003eOptionally allows for error tolerance during reprojection for increased performance.\u003c/p\u003e\n"]]],[],null,["# ee.Geometry.LinearRing.perimeter\n\nReturns the length of the perimeter of the polygonal parts of the geometry. The perimeter of multi geometries is the sum of the perimeters of their components.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-------------------------------------------------|---------|\n| LinearRing.perimeter`(`*maxError* `, `*proj*`)` | Float |\n\n| Argument | Type | Details |\n|------------------|----------------------------|----------------------------------------------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | The input geometry. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |\n| `proj` | Projection, default: null | If specified, the result will be in the units of the coordinate system of this projection. Otherwise it will be in meters. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Define a LinearRing object.\nvar linearRing = ee.Geometry.LinearRing(\n [[-122.091, 37.420],\n [-122.085, 37.422],\n [-122.080, 37.430]]);\n\n// Apply the perimeter method to the LinearRing object.\nvar linearRingPerimeter = linearRing.perimeter({'maxError': 1});\n\n// Print the result to the console.\nprint('linearRing.perimeter(...) =', linearRingPerimeter);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(linearRing,\n {'color': 'black'},\n 'Geometry [black]: linearRing');\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 LinearRing object.\nlinearring = ee.Geometry.LinearRing(\n [[-122.091, 37.420], [-122.085, 37.422], [-122.080, 37.430]]\n)\n\n# Apply the perimeter method to the LinearRing object.\nlinearring_perimeter = linearring.perimeter(maxError=1)\n\n# Print the result.\ndisplay('linearring.perimeter(...) =', linearring_perimeter)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(linearring, {'color': 'black'}, 'Geometry [black]: linearring')\nm\n```"]]