ee.Geometry.MultiPolygon.buffer

返回按给定距离缓冲的输入。如果距离为正数,则几何图形会展开;如果距离为负数,则几何图形会收缩。

用法返回
MultiPolygon.buffer(distance, maxError, proj)几何图形
实参类型详细信息
this:geometry几何图形要缓冲的几何图形。
distance浮点数缓冲的距离,可以为负数。如果未指定投影,则单位为米。否则,单位为投影的坐标系。
maxErrorErrorMargin,默认值:null在近似缓冲圆和执行任何必要重投影时允许的最大误差量。如果未指定,则默认为距离的 1%。
proj投影,默认值:null如果指定了此属性,则缓冲将在此投影中执行,并且距离将被解释为此投影的坐标系的单位。否则,距离将被解释为米,并且缓冲将在球形坐标系中执行。

示例

代码编辑器 (JavaScript)

// Define a MultiPolygon object.
var multiPolygon = ee.Geometry.MultiPolygon(
    [[[[-122.092, 37.424],
       [-122.086, 37.418],
       [-122.079, 37.425],
       [-122.085, 37.423]]],
     [[[-122.081, 37.417],
       [-122.086, 37.421],
       [-122.089, 37.416]]]]);

// Apply the buffer method to the MultiPolygon object.
var multiPolygonBuffer = multiPolygon.buffer({'distance': 100});

// Print the result to the console.
print('multiPolygon.buffer(...) =', multiPolygonBuffer);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(multiPolygon,
             {'color': 'black'},
             'Geometry [black]: multiPolygon');
Map.addLayer(multiPolygonBuffer,
             {'color': 'red'},
             'Result [red]: multiPolygon.buffer');

Python 设置

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

import ee
import geemap.core as geemap

Colab (Python)

# Define a MultiPolygon object.
multipolygon = ee.Geometry.MultiPolygon([
    [[
        [-122.092, 37.424],
        [-122.086, 37.418],
        [-122.079, 37.425],
        [-122.085, 37.423],
    ]],
    [[[-122.081, 37.417], [-122.086, 37.421], [-122.089, 37.416]]],
])

# Apply the buffer method to the MultiPolygon object.
multipolygon_buffer = multipolygon.buffer(distance=100)

# Print the result.
display('multipolygon.buffer(...) =', multipolygon_buffer)

# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(
    multipolygon, {'color': 'black'}, 'Geometry [black]: multipolygon'
)
m.add_layer(
    multipolygon_buffer, {'color': 'red'}, 'Result [red]: multipolygon.buffer'
)
m