Annuncio: tutti i progetti non commerciali registrati per l'utilizzo di Earth Engine prima del
15 aprile 2025 devono
verificare l'idoneità non commerciale per mantenere l'accesso a Earth Engine.
ee.Geometry.MultiPolygon.dissolve
Mantieni tutto organizzato con le raccolte
Salva e classifica i contenuti in base alle tue preferenze.
Restituisce l'unione della geometria. Lascia invariate le singole geometrie e unisce quelle multiple.
Utilizzo | Resi |
---|
MultiPolygon.dissolve(maxError, proj) | Geometria |
Argomento | Tipo | Dettagli |
---|
questo: geometry | Geometria | La geometria da unire. |
maxError | ErrorMargin, valore predefinito: null | La quantità massima di errore tollerata durante l'esecuzione di qualsiasi riproiezione necessaria. |
proj | Proiezione, valore predefinito: null | Se specificata, l'unione verrà eseguita in questa proiezione. In caso contrario, verrà eseguita in un sistema di coordinate sferiche. |
Esempi
Editor di codice (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 dissolve method to the MultiPolygon object.
var multiPolygonDissolve = multiPolygon.dissolve({'maxError': 1});
// Print the result to the console.
print('multiPolygon.dissolve(...) =', multiPolygonDissolve);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(multiPolygon,
{'color': 'black'},
'Geometry [black]: multiPolygon');
Map.addLayer(multiPolygonDissolve,
{'color': 'red'},
'Result [red]: multiPolygon.dissolve');
Configurazione di Python
Consulta la pagina
Ambiente Python per informazioni sull'API Python e sull'utilizzo di
geemap
per lo sviluppo interattivo.
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 dissolve method to the MultiPolygon object.
multipolygon_dissolve = multipolygon.dissolve(maxError=1)
# Print the result.
display('multipolygon.dissolve(...) =', multipolygon_dissolve)
# 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(
multipolygon_dissolve,
{'color': 'red'},
'Result [red]: multipolygon.dissolve',
)
m
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
Ultimo aggiornamento 2025-07-26 UTC.
[null,null,["Ultimo aggiornamento 2025-07-26 UTC."],[[["\u003cp\u003eThe \u003ccode\u003edissolve()\u003c/code\u003e method returns the union of the geometries within a MultiPolygon, effectively merging them into a single, unified geometry.\u003c/p\u003e\n"],["\u003cp\u003eIt accepts optional parameters like \u003ccode\u003emaxError\u003c/code\u003e to control the tolerance for reprojection errors and \u003ccode\u003eproj\u003c/code\u003e to specify the projection for the union operation.\u003c/p\u003e\n"],["\u003cp\u003eSingle geometries remain unaffected by this operation as they are already in their simplest form.\u003c/p\u003e\n"],["\u003cp\u003eThis function is valuable for simplifying complex MultiPolygons by dissolving internal boundaries and creating a contiguous shape.\u003c/p\u003e\n"],["\u003cp\u003eExamples in JavaScript and Python demonstrate the usage of the \u003ccode\u003edissolve()\u003c/code\u003e method and its impact on a sample MultiPolygon.\u003c/p\u003e\n"]]],["The `dissolve` method unions geometries, leaving single geometries unchanged and operating on multi-geometries. It accepts `maxError` to control reprojection tolerance and an optional `proj` for the target projection. The method is illustrated through examples in JavaScript and Python, defining a `MultiPolygon` and using `dissolve` with a set error. The result, a unified geometry, is then printed and visualized on a map alongside the original `MultiPolygon`.\n"],null,["# ee.Geometry.MultiPolygon.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| MultiPolygon.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 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// Apply the dissolve method to the MultiPolygon object.\nvar multiPolygonDissolve = multiPolygon.dissolve({'maxError': 1});\n\n// Print the result to the console.\nprint('multiPolygon.dissolve(...) =', multiPolygonDissolve);\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(multiPolygonDissolve,\n {'color': 'red'},\n 'Result [red]: multiPolygon.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 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# Apply the dissolve method to the MultiPolygon object.\nmultipolygon_dissolve = multipolygon.dissolve(maxError=1)\n\n# Print the result.\ndisplay('multipolygon.dissolve(...) =', multipolygon_dissolve)\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(\n multipolygon_dissolve,\n {'color': 'red'},\n 'Result [red]: multipolygon.dissolve',\n)\nm\n```"]]