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ee.Feature.buffer
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Salva e classifica i contenuti in base alle tue preferenze.
Restituisce l'input memorizzato nel buffer in base a una distanza specificata. Se la distanza è positiva, la geometria viene espansa, mentre se è negativa, viene contratta.
Utilizzo | Resi |
---|
Feature.buffer(distance, maxError, proj) | Funzionalità |
Argomento | Tipo | Dettagli |
---|
questo: feature | Elemento | La funzionalità di cui viene eseguito il buffering della geometria. |
distance | Float | La distanza del buffering, che può essere negativa. Se non viene specificata alcuna proiezione, l'unità è metri. In caso contrario, l'unità si trova nel sistema di coordinate della proiezione. |
maxError | ErrorMargin, valore predefinito: null | La quantità massima di errore tollerata durante l'approssimazione del cerchio di buffering e l'esecuzione di qualsiasi riproiezione necessaria. Se non specificato, il valore predefinito è l'1% della distanza. |
proj | Proiezione, valore predefinito: null | Se specificato, il buffering verrà eseguito in questa proiezione e la distanza verrà interpretata come unità del sistema di coordinate di questa proiezione. In caso contrario, la distanza viene interpretata come metri e il buffering viene eseguito in un sistema di coordinate sferiche. |
Esempi
Editor di codice (JavaScript)
// Polygon feature of Serengeti National Park.
var feature = ee.FeatureCollection('WCMC/WDPA/202307/polygons')
.filter('ORIG_NAME == "Serengeti National Park"')
.first();
// Cast the resulting object as an ee.Feature so that the call to the buffer
// method is unambiguous (first() and buffer() are shared by multiple classes).
feature = ee.Feature(feature);
// Generate buffered features out and in from the original boundary.
var bufferOut = feature.buffer(10000); // 10 km out
var bufferIn = feature.buffer(-10000); // 10 km in
// Display the features on the map.
Map.addLayer(bufferOut, {color: 'red'}, 'Buffer out');
Map.addLayer(feature, {color: 'blue'}, 'No buffer');
Map.addLayer(bufferIn, {color: 'yellow'}, 'Buffer in');
Map.setCenter(34.8407, -2.398, 8);
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)
# Polygon feature of Serengeti National Park.
feature = (
ee.FeatureCollection('WCMC/WDPA/202307/polygons')
.filter('ORIG_NAME == "Serengeti National Park"')
.first()
)
# Cast the resulting object as an ee.Feature so that the call to the buffer
# method is unambiguous (first() and buffer() are shared by multiple classes).
feature = ee.Feature(feature)
# Generate buffered features out and in from the original boundary.
buffer_out = feature.buffer(10000) # 10 km out
buffer_in = feature.buffer(-10000) # 10 km in
# Display the features on the map.
m = geemap.Map()
m.add_layer(buffer_out, {'color': 'red'}, 'Buffer out')
m.add_layer(feature, {'color': 'blue'}, 'No buffer')
m.add_layer(buffer_in, {'color': 'yellow'}, 'Buffer in')
m.set_center(34.8407, -2.398, 8)
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\u003eReturns a Feature with geometry buffered by a specified distance.\u003c/p\u003e\n"],["\u003cp\u003ePositive distance expands the geometry; negative distance contracts it.\u003c/p\u003e\n"],["\u003cp\u003eBuffering can be performed using meters or a projected coordinate system.\u003c/p\u003e\n"],["\u003cp\u003eAn optional error margin controls the approximation accuracy.\u003c/p\u003e\n"]]],["The `buffer()` method expands or contracts a feature's geometry by a specified distance. A positive distance expands the geometry, while a negative distance contracts it. The `distance` is in meters unless a `proj` projection is given, in which case the units are in the projection's coordinate system. An optional `maxError` sets tolerance. The method returns a new `Feature` that represents the geometry buffered with the parameters used.\n"],null,["# ee.Feature.buffer\n\nReturns the input buffered by a given distance. If the distance is positive, the geometry is expanded, and if the distance is negative, the geometry is contracted.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------------------|---------|\n| Feature.buffer`(distance, `*maxError* `, `*proj*`)` | Feature |\n\n| Argument | Type | Details |\n|-----------------|----------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| this: `feature` | Element | The feature the geometry of which is being buffered. |\n| `distance` | Float | The distance of the buffering, which may be negative. If no projection is specified, the unit is meters. Otherwise the unit is in the coordinate system of the projection. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when approximating the buffering circle and performing any necessary reprojection. If unspecified, defaults to 1% of the distance. |\n| `proj` | Projection, default: null | If specified, the buffering will be performed in this projection and the distance will be interpreted as units of the coordinate system of this projection. Otherwise the distance is interpereted as meters and the buffering is performed in a spherical coordinate system. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Polygon feature of Serengeti National Park.\nvar feature = ee.FeatureCollection('WCMC/WDPA/202307/polygons')\n .filter('ORIG_NAME == \"Serengeti National Park\"')\n .first();\n\n// Cast the resulting object as an ee.Feature so that the call to the buffer\n// method is unambiguous (first() and buffer() are shared by multiple classes).\nfeature = ee.Feature(feature);\n\n// Generate buffered features out and in from the original boundary.\nvar bufferOut = feature.buffer(10000); // 10 km out\nvar bufferIn = feature.buffer(-10000); // 10 km in\n\n// Display the features on the map.\nMap.addLayer(bufferOut, {color: 'red'}, 'Buffer out');\nMap.addLayer(feature, {color: 'blue'}, 'No buffer');\nMap.addLayer(bufferIn, {color: 'yellow'}, 'Buffer in');\nMap.setCenter(34.8407, -2.398, 8);\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# Polygon feature of Serengeti National Park.\nfeature = (\n ee.FeatureCollection('WCMC/WDPA/202307/polygons')\n .filter('ORIG_NAME == \"Serengeti National Park\"')\n .first()\n)\n\n# Cast the resulting object as an ee.Feature so that the call to the buffer\n# method is unambiguous (first() and buffer() are shared by multiple classes).\nfeature = ee.Feature(feature)\n\n# Generate buffered features out and in from the original boundary.\nbuffer_out = feature.buffer(10000) # 10 km out\nbuffer_in = feature.buffer(-10000) # 10 km in\n\n# Display the features on the map.\nm = geemap.Map()\nm.add_layer(buffer_out, {'color': 'red'}, 'Buffer out')\nm.add_layer(feature, {'color': 'blue'}, 'No buffer')\nm.add_layer(buffer_in, {'color': 'yellow'}, 'Buffer in')\nm.set_center(34.8407, -2.398, 8)\nm\n```"]]