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Returns the length of the perimeter of the polygonal parts of the geometry. The perimeter of multi geometries is the sum of the perimeters of their components.
Usage
Returns
MultiPolygon.perimeter(maxError, proj)
Float
Argument
Type
Details
this: geometry
Geometry
The input geometry.
maxError
ErrorMargin, default: null
The maximum amount of error tolerated when performing any necessary reprojection.
proj
Projection, default: null
If specified, the result will be in the units of the coordinate system of this projection. Otherwise it will be in meters.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2023-10-06 UTC."],[[["\u003cp\u003eCalculates the total length of all the outer edges of a MultiPolygon geometry.\u003c/p\u003e\n"],["\u003cp\u003eThe perimeter of a MultiPolygon is the sum of the perimeters of all its individual polygons.\u003c/p\u003e\n"],["\u003cp\u003eAccepts optional parameters for projection and error tolerance during calculations.\u003c/p\u003e\n"],["\u003cp\u003eReturns the perimeter value as a float, representing the total distance in meters or the specified projection's units.\u003c/p\u003e\n"]]],["The `perimeter()` method calculates the total perimeter of a geometry's polygonal parts. For MultiPolygon geometries, it sums the perimeters of each component. It accepts optional `maxError` and `proj` arguments to control reprojection accuracy and output units. The method returns a float representing the perimeter length. Examples demonstrate its usage in both JavaScript and Python, calculating and displaying the perimeter of a MultiPolygon. The units will be in meters unless a different projection is defined.\n"],null,["# ee.Geometry.MultiPolygon.perimeter\n\nReturns the length of the perimeter of the polygonal parts of the geometry. The perimeter of multi geometries is the sum of the perimeters of their components.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|---------------------------------------------------|---------|\n| MultiPolygon.perimeter`(`*maxError* `, `*proj*`)` | Float |\n\n| Argument | Type | Details |\n|------------------|----------------------------|----------------------------------------------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | The input geometry. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |\n| `proj` | Projection, default: null | If specified, the result will be in the units of the coordinate system of this projection. Otherwise it will be in meters. |\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 perimeter method to the MultiPolygon object.\nvar multiPolygonPerimeter = multiPolygon.perimeter({'maxError': 1});\n\n// Print the result to the console.\nprint('multiPolygon.perimeter(...) =', multiPolygonPerimeter);\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');\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 perimeter method to the MultiPolygon object.\nmultipolygon_perimeter = multipolygon.perimeter(maxError=1)\n\n# Print the result.\ndisplay('multipolygon.perimeter(...) =', multipolygon_perimeter)\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\n```"]]