お知らせ:
2025 年 4 月 15 日より前に Earth Engine の使用を登録したすべての非商用プロジェクトは、Earth Engine へのアクセスを維持するために
非商用目的での利用資格を確認する必要があります。
ee.Geometry.MultiPolygon.difference
コレクションでコンテンツを整理
必要に応じて、コンテンツの保存と分類を行います。
「左」のジオメトリから「右」のジオメトリを減算した結果を返します。
用途 | 戻り値 |
---|
MultiPolygon.difference(right, maxError, proj) | ジオメトリ |
引数 | タイプ | 詳細 |
---|
これ: left | ジオメトリ | オペレーションの左オペランドとして使用されるジオメトリ。 |
right | ジオメトリ | 演算の右オペランドとして使用されるジオメトリ。 |
maxError | ErrorMargin、デフォルト: null | 必要な再投影を行う際に許容される最大誤差。 |
proj | Projection、デフォルト: null | オペレーションを実行するプロジェクション。指定しない場合、演算は球面座標系で実行され、線形距離は球面のメートル単位になります。 |
例
コードエディタ(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]]]]);
// Define other inputs.
var inputGeom = ee.Geometry.BBox(-122.085, 37.415, -122.075, 37.425);
// Apply the difference method to the MultiPolygon object.
var multiPolygonDifference = multiPolygon.difference({'right': inputGeom, 'maxError': 1});
// Print the result to the console.
print('multiPolygon.difference(...) =', multiPolygonDifference);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(multiPolygon,
{'color': 'black'},
'Geometry [black]: multiPolygon');
Map.addLayer(inputGeom,
{'color': 'blue'},
'Parameter [blue]: inputGeom');
Map.addLayer(multiPolygonDifference,
{'color': 'red'},
'Result [red]: multiPolygon.difference');
Python の設定
Python API とインタラクティブな開発での geemap
の使用については、
Python 環境のページをご覧ください。
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]]],
])
# Define other inputs.
input_geom = ee.Geometry.BBox(-122.085, 37.415, -122.075, 37.425)
# Apply the difference method to the MultiPolygon object.
multipolygon_difference = multipolygon.difference(right=input_geom, maxError=1)
# Print the result.
display('multipolygon.difference(...) =', multipolygon_difference)
# 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.add_layer(input_geom, {'color': 'blue'}, 'Parameter [blue]: input_geom')
m.add_layer(
multipolygon_difference,
{'color': 'red'},
'Result [red]: multipolygon.difference',
)
m
特に記載のない限り、このページのコンテンツはクリエイティブ・コモンズの表示 4.0 ライセンスにより使用許諾されます。コードサンプルは Apache 2.0 ライセンスにより使用許諾されます。詳しくは、Google Developers サイトのポリシーをご覧ください。Java は Oracle および関連会社の登録商標です。
最終更新日 2025-07-26 UTC。
[null,null,["最終更新日 2025-07-26 UTC。"],[[["\u003cp\u003e\u003ccode\u003edifference()\u003c/code\u003e returns a Geometry representing the portion of the 'left' geometry that does not intersect with the 'right' geometry.\u003c/p\u003e\n"],["\u003cp\u003eThis method can be used with MultiPolygon geometries to find the areas where they do not overlap with another geometry.\u003c/p\u003e\n"],["\u003cp\u003eOptional parameters include \u003ccode\u003emaxError\u003c/code\u003e for reprojection tolerance and \u003ccode\u003eproj\u003c/code\u003e for specifying the projection.\u003c/p\u003e\n"],["\u003cp\u003eThe result of this operation can be used in further geospatial analysis or visualization.\u003c/p\u003e\n"]]],["The `difference` method subtracts a 'right' geometry from a 'left' geometry (a `MultiPolygon`). It returns a new `Geometry` object. Key arguments include the `right` geometry, an optional `maxError` for reprojection tolerance, and an optional `proj` for the operation's projection. The operation is performed in a spherical coordinate system by default. Examples illustrate creating a `MultiPolygon`, defining a `BBox`, applying the difference method and displaying the output.\n"],null,["# ee.Geometry.MultiPolygon.difference\n\nReturns the result of subtracting the 'right' geometry from the 'left' geometry.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------------------------|----------|\n| MultiPolygon.difference`(right, `*maxError* `, `*proj*`)` | Geometry |\n\n| Argument | Type | Details |\n|--------------|----------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `left` | Geometry | The geometry used as the left operand of the operation. |\n| `right` | Geometry | The geometry used as the right operand of the operation. |\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 MultiPolygon object.\nvar multiPolygon = ee.Geometry.MultiPolygon(\n [[[[-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423]]],\n [[[-122.081, 37.417],\n [-122.086, 37.421],\n [-122.089, 37.416]]]]);\n\n// Define other inputs.\nvar inputGeom = ee.Geometry.BBox(-122.085, 37.415, -122.075, 37.425);\n\n// Apply the difference method to the MultiPolygon object.\nvar multiPolygonDifference = multiPolygon.difference({'right': inputGeom, 'maxError': 1});\n\n// Print the result to the console.\nprint('multiPolygon.difference(...) =', multiPolygonDifference);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(multiPolygon,\n {'color': 'black'},\n 'Geometry [black]: multiPolygon');\nMap.addLayer(inputGeom,\n {'color': 'blue'},\n 'Parameter [blue]: inputGeom');\nMap.addLayer(multiPolygonDifference,\n {'color': 'red'},\n 'Result [red]: multiPolygon.difference');\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 MultiPolygon object.\nmultipolygon = ee.Geometry.MultiPolygon([\n [[\n [-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423],\n ]],\n [[[-122.081, 37.417], [-122.086, 37.421], [-122.089, 37.416]]],\n])\n\n# Define other inputs.\ninput_geom = ee.Geometry.BBox(-122.085, 37.415, -122.075, 37.425)\n\n# Apply the difference method to the MultiPolygon object.\nmultipolygon_difference = multipolygon.difference(right=input_geom, maxError=1)\n\n# Print the result.\ndisplay('multipolygon.difference(...) =', multipolygon_difference)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(\n multipolygon, {'color': 'black'}, 'Geometry [black]: multipolygon'\n)\nm.add_layer(input_geom, {'color': 'blue'}, 'Parameter [blue]: input_geom')\nm.add_layer(\n multipolygon_difference,\n {'color': 'red'},\n 'Result [red]: multipolygon.difference',\n)\nm\n```"]]