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ee.Geometry.dissolve
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Returns the union of the geometry. This leaves single geometries untouched, and unions multi geometries.
| Usage | Returns | Geometry.dissolve(maxError, proj) | Geometry |
| Argument | Type | Details | this: geometry | Geometry | The geometry to union. |
maxError | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |
proj | Projection, default: null | If specified, the union will be performed in this projection. Otherwise it will be performed in a spherical coordinate system. |
Examples
Code Editor (JavaScript)
// Define a Geometry object.
var geometry = ee.Geometry({
'type': 'Polygon',
'coordinates':
[[[-122.081, 37.417],
[-122.086, 37.421],
[-122.084, 37.418],
[-122.089, 37.416]]]
});
// Apply the dissolve method to the Geometry object.
var geometryDissolve = geometry.dissolve({'maxError': 1});
// Print the result to the console.
print('geometry.dissolve(...) =', geometryDissolve);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(geometry,
{'color': 'black'},
'Geometry [black]: geometry');
Map.addLayer(geometryDissolve,
{'color': 'red'},
'Result [red]: geometry.dissolve');
Python setup
See the
Python Environment page for information on the Python API and using
geemap for interactive development.
import ee
import geemap.core as geemap
Colab (Python)
# Define a Geometry object.
geometry = ee.Geometry({
'type': 'Polygon',
'coordinates': [[
[-122.081, 37.417],
[-122.086, 37.421],
[-122.084, 37.418],
[-122.089, 37.416],
]],
})
# Apply the dissolve method to the Geometry object.
geometry_dissolve = geometry.dissolve(maxError=1)
# Print the result.
display('geometry.dissolve(...) =', geometry_dissolve)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(geometry, {'color': 'black'}, 'Geometry [black]: geometry')
m.add_layer(
geometry_dissolve, {'color': 'red'}, 'Result [red]: geometry.dissolve'
)
m
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Last updated 2023-10-06 UTC.
[null,null,["Last updated 2023-10-06 UTC."],[[["\u003cp\u003e\u003ccode\u003edissolve()\u003c/code\u003e returns a Geometry object representing the union of the input geometry's components.\u003c/p\u003e\n"],["\u003cp\u003eIt simplifies MultiGeometries by merging overlapping or adjacent parts, while leaving single geometries unchanged.\u003c/p\u003e\n"],["\u003cp\u003eOptional parameters \u003ccode\u003emaxError\u003c/code\u003e and \u003ccode\u003eproj\u003c/code\u003e control the reprojection tolerance and target projection for the union operation, respectively.\u003c/p\u003e\n"],["\u003cp\u003eUseful for dissolving boundaries between features within a MultiGeometry or creating a single, unified geometry from multiple overlapping geometries.\u003c/p\u003e\n"]]],["The `dissolve` method unions geometries, leaving single geometries unchanged and operating on multi-geometries. It takes `maxError` (maximum error tolerance during reprojection) and `proj` (projection for the union) as optional arguments. If `proj` is not specified, it uses a spherical coordinate system. The method returns a `Geometry` object. Example code demonstrates applying `dissolve` to a polygon, setting `maxError` to 1, and displaying the original and dissolved geometries on a map.\n"],null,["# ee.Geometry.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| Geometry.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 Geometry object.\nvar geometry = ee.Geometry({\n 'type': 'Polygon',\n 'coordinates':\n [[[-122.081, 37.417],\n [-122.086, 37.421],\n [-122.084, 37.418],\n [-122.089, 37.416]]]\n});\n\n// Apply the dissolve method to the Geometry object.\nvar geometryDissolve = geometry.dissolve({'maxError': 1});\n\n// Print the result to the console.\nprint('geometry.dissolve(...) =', geometryDissolve);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(geometry,\n {'color': 'black'},\n 'Geometry [black]: geometry');\nMap.addLayer(geometryDissolve,\n {'color': 'red'},\n 'Result [red]: geometry.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 Geometry object.\ngeometry = ee.Geometry({\n 'type': 'Polygon',\n 'coordinates': [[\n [-122.081, 37.417],\n [-122.086, 37.421],\n [-122.084, 37.418],\n [-122.089, 37.416],\n ]],\n})\n\n# Apply the dissolve method to the Geometry object.\ngeometry_dissolve = geometry.dissolve(maxError=1)\n\n# Print the result.\ndisplay('geometry.dissolve(...) =', geometry_dissolve)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(geometry, {'color': 'black'}, 'Geometry [black]: geometry')\nm.add_layer(\n geometry_dissolve, {'color': 'red'}, 'Result [red]: geometry.dissolve'\n)\nm\n```"]]