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ee.Geometry.BBox.dissolve
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
傳回幾何聯集。這不會影響單一幾何圖形,但會合併多重幾何圖形。
用量 | 傳回 |
---|
BBox.dissolve(maxError, proj) | 幾何圖形 |
引數 | 類型 | 詳細資料 |
---|
這個:geometry | 幾何圖形 | 要聯集的幾何圖形。 |
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,聯集將在這個投影中執行。否則會以球體座標系統執行。 |
範例
程式碼編輯器 (JavaScript)
// Define a BBox object.
var bBox = ee.Geometry.BBox(-122.09, 37.42, -122.08, 37.43);
// Apply the dissolve method to the BBox object.
var bBoxDissolve = bBox.dissolve({'maxError': 1});
// Print the result to the console.
print('bBox.dissolve(...) =', bBoxDissolve);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(bBox,
{'color': 'black'},
'Geometry [black]: bBox');
Map.addLayer(bBoxDissolve,
{'color': 'red'},
'Result [red]: bBox.dissolve');
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 BBox object.
bbox = ee.Geometry.BBox(-122.09, 37.42, -122.08, 37.43)
# Apply the dissolve method to the BBox object.
bbox_dissolve = bbox.dissolve(maxError=1)
# Print the result.
display('bbox.dissolve(...) =', bbox_dissolve)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(bbox, {'color': 'black'}, 'Geometry [black]: bbox')
m.add_layer(bbox_dissolve, {'color': 'red'}, 'Result [red]: bbox.dissolve')
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\u003eThe \u003ccode\u003edissolve()\u003c/code\u003e method returns the union of a geometry, which is useful for combining multiple geometries into a single one.\u003c/p\u003e\n"],["\u003cp\u003eIt can be applied to both single and multi-geometries, leaving single geometries unchanged.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003edissolve()\u003c/code\u003e accepts optional \u003ccode\u003emaxError\u003c/code\u003e and \u003ccode\u003eproj\u003c/code\u003e parameters to control reprojection during the union process.\u003c/p\u003e\n"],["\u003cp\u003eThis method is particularly valuable for simplifying complex geometries or creating continuous boundaries from fragmented shapes.\u003c/p\u003e\n"]]],["The `dissolve` method unions geometries, leaving single geometries unchanged and operating on multi-geometries. It takes a `geometry` as input, and optionally `maxError` for reprojection tolerance and `proj` for a specific projection. The function returns a `Geometry` object. Examples in JavaScript and Python demonstrate applying `dissolve` to a BBox, setting `maxError` to 1 and visualizing the original and dissolved geometries on a map.\n"],null,["# ee.Geometry.BBox.dissolve\n\nReturns the union of the geometry. This leaves single geometries untouched, and unions multi geometries.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|------------------------------------------|----------|\n| BBox.dissolve`(`*maxError* `, `*proj*`)` | Geometry |\n\n| Argument | Type | Details |\n|------------------|----------------------------|--------------------------------------------------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | The geometry to union. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |\n| `proj` | Projection, default: null | If specified, the union will be performed in this projection. Otherwise it will be performed in a spherical coordinate system. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Define a BBox object.\nvar bBox = ee.Geometry.BBox(-122.09, 37.42, -122.08, 37.43);\n\n// Apply the dissolve method to the BBox object.\nvar bBoxDissolve = bBox.dissolve({'maxError': 1});\n\n// Print the result to the console.\nprint('bBox.dissolve(...) =', bBoxDissolve);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(bBox,\n {'color': 'black'},\n 'Geometry [black]: bBox');\nMap.addLayer(bBoxDissolve,\n {'color': 'red'},\n 'Result [red]: bBox.dissolve');\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 BBox object.\nbbox = ee.Geometry.BBox(-122.09, 37.42, -122.08, 37.43)\n\n# Apply the dissolve method to the BBox object.\nbbox_dissolve = bbox.dissolve(maxError=1)\n\n# Print the result.\ndisplay('bbox.dissolve(...) =', bbox_dissolve)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(bbox, {'color': 'black'}, 'Geometry [black]: bbox')\nm.add_layer(bbox_dissolve, {'color': 'red'}, 'Result [red]: bbox.dissolve')\nm\n```"]]