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ee.Geometry.Polygon.dissolve
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Returns the union of the geometry. This leaves single geometries untouched, and unions multi geometries.
| Usage | Returns | Polygon.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 Polygon object.
var polygon = ee.Geometry.Polygon(
[[[-122.092, 37.424],
[-122.086, 37.418],
[-122.079, 37.425],
[-122.085, 37.423]]]);
// Apply the dissolve method to the Polygon object.
var polygonDissolve = polygon.dissolve({'maxError': 1});
// Print the result to the console.
print('polygon.dissolve(...) =', polygonDissolve);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(polygon,
{'color': 'black'},
'Geometry [black]: polygon');
Map.addLayer(polygonDissolve,
{'color': 'red'},
'Result [red]: polygon.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 Polygon object.
polygon = ee.Geometry.Polygon([[
[-122.092, 37.424],
[-122.086, 37.418],
[-122.079, 37.425],
[-122.085, 37.423],
]])
# Apply the dissolve method to the Polygon object.
polygon_dissolve = polygon.dissolve(maxError=1)
# Print the result.
display('polygon.dissolve(...) =', polygon_dissolve)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(polygon, {'color': 'black'}, 'Geometry [black]: polygon')
m.add_layer(
polygon_dissolve, {'color': 'red'}, 'Result [red]: polygon.dissolve'
)
m
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Last updated 2023-10-06 UTC.
[null,null,["Last updated 2023-10-06 UTC."],[[["\u003cp\u003eReturns a Geometry representing the union of the input geometry's components.\u003c/p\u003e\n"],["\u003cp\u003ePrimarily used to union the parts of a MultiGeometry, leaving single geometries unchanged.\u003c/p\u003e\n"],["\u003cp\u003eCan be performed in a specified projection using the \u003ccode\u003eproj\u003c/code\u003e argument or spherically if left unspecified.\u003c/p\u003e\n"],["\u003cp\u003eAccepts an optional \u003ccode\u003emaxError\u003c/code\u003e argument to control error tolerance during reprojection.\u003c/p\u003e\n"]]],[],null,["# ee.Geometry.Polygon.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| Polygon.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 Polygon object.\nvar polygon = ee.Geometry.Polygon(\n [[[-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423]]]);\n\n// Apply the dissolve method to the Polygon object.\nvar polygonDissolve = polygon.dissolve({'maxError': 1});\n\n// Print the result to the console.\nprint('polygon.dissolve(...) =', polygonDissolve);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(polygon,\n {'color': 'black'},\n 'Geometry [black]: polygon');\nMap.addLayer(polygonDissolve,\n {'color': 'red'},\n 'Result [red]: polygon.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 Polygon object.\npolygon = ee.Geometry.Polygon([[\n [-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423],\n]])\n\n# Apply the dissolve method to the Polygon object.\npolygon_dissolve = polygon.dissolve(maxError=1)\n\n# Print the result.\ndisplay('polygon.dissolve(...) =', polygon_dissolve)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(polygon, {'color': 'black'}, 'Geometry [black]: polygon')\nm.add_layer(\n polygon_dissolve, {'color': 'red'}, 'Result [red]: polygon.dissolve'\n)\nm\n```"]]