ee.Feature.buffer

返回按指定距离缓冲的输入。如果距离为正值，则几何图形会扩大；如果距离为负值，则几何图形会缩小。

用法返回
Feature.buffer(distance, maxError, proj)功能
参数类型详细信息
此：feature元素要缓冲的几何图形所对应的地图项。
distance浮点数缓冲的距离，可能为负值。如果未指定投影，则单位为米。否则，单位将采用投影的坐标系。
maxErrorErrorMargin，默认值：null在近似计算缓冲区圆和执行任何必要的重新投影时，可容忍的最大误差量。如果未指定，则默认为距离的 1%。
proj投影，默认值：null如果指定，则缓冲将在此投影中执行，并且距离将解释为此投影的坐标系单位。否则，距离将被解读为米，并且缓冲将在球面坐标系中执行。

示例

代码编辑器 (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);

Python 设置

如需了解 Python API 和如何使用 geemap 进行交互式开发，请参阅 Python 环境页面。

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