ee.Geometry.MultiPolygon.perimeter

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
MultiPolygon.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。
maxErrorErrorMargin，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 MultiPolygon object.
var multiPolygon = ee.Geometry.MultiPolygon(
    [[[[-122.092, 37.424],
       [-122.086, 37.418],
       [-122.079, 37.425],
       [-122.085, 37.423]]],
     [[[-122.081, 37.417],
       [-122.086, 37.421],
       [-122.089, 37.416]]]]);

// Apply the perimeter method to the MultiPolygon object.
var multiPolygonPerimeter = multiPolygon.perimeter({'maxError': 1});

// Print the result to the console.
print('multiPolygon.perimeter(...) =', multiPolygonPerimeter);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(multiPolygon,
             {'color': 'black'},
             'Geometry [black]: multiPolygon');

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 MultiPolygon object.
multipolygon = ee.Geometry.MultiPolygon([
    [[
        [-122.092, 37.424],
        [-122.086, 37.418],
        [-122.079, 37.425],
        [-122.085, 37.423],
    ]],
    [[[-122.081, 37.417], [-122.086, 37.421], [-122.089, 37.416]]],
])

# Apply the perimeter method to the MultiPolygon object.
multipolygon_perimeter = multipolygon.perimeter(maxError=1)

# Print the result.
display('multipolygon.perimeter(...) =', multipolygon_perimeter)

# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(
    multipolygon, {'color': 'black'}, 'Geometry [black]: multipolygon'
)
m