ee.FeatureCollection.merge

将两个集合合并为一个。结果包含任一集合中的所有元素。

第一个集合中的元素的 ID 将以“1”为前缀，第二个集合中的元素的 ID 将以“2”为前缀。

注意： 如果需要合并多个集合，请考虑将它们全部放入一个集合中，然后使用 FeatureCollection.flatten()。重复使用 FeatureCollection.merge() 会导致元素 ID 越来越长，并降低性能。

用法	返回
FeatureCollection.merge(collection2)	FeatureCollection

参数	类型	详细信息
此：collection1	FeatureCollection	要合并的第一个集合。
collection2	FeatureCollection	要合并的第二个集合。

示例

代码编辑器 (JavaScript)

// FeatureCollection of points representing forest cover.
var fcForest = ee.FeatureCollection([
  ee.Feature(ee.Geometry.Point([-122.248, 37.238]),
             {'id': 0, 'cover_class': 'forest'}),
  ee.Feature(ee.Geometry.Point([-122.204, 37.222]),
             {'id': 1, 'cover_class': 'forest'}),
  ee.Feature(ee.Geometry.Point([-122.110, 37.199]),
             {'id': 2, 'cover_class': 'forest'})
]);

// FeatureCollection of points representing urban cover.
var fcUrban = ee.FeatureCollection([
  ee.Feature(ee.Geometry.Point([-121.953, 37.372]),
             {'id': 0, 'cover_class': 'urban'}),
  ee.Feature(ee.Geometry.Point([-121.861, 37.308]),
             {'id': 1, 'cover_class': 'urban'}),
  ee.Feature(ee.Geometry.Point([-121.984, 37.372]),
             {'id': 2, 'cover_class': 'urban'})
]);

// Merge the two FeatureCollections into one.
var fcMerged = fcForest.merge(fcUrban);

// Display FeatureCollections on the map.
Map.setCenter(-122.034, 37.296, 11);
Map.addLayer(fcForest, {color: 'green'}, 'Forest points');
Map.addLayer(fcUrban, {color: 'grey'}, 'Urban points');
Map.addLayer(fcMerged, {color: 'yellow'}, 'Protected areas merged');

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)

# FeatureCollection of points representing forest cover.
fc_forest = ee.FeatureCollection([
    ee.Feature(
        ee.Geometry.Point([-122.248, 37.238]),
        {
            'id': 0,
            'cover_class': 'forest',
            'id': 0,
            'cover_class': 'forest',
        },
    ),
    ee.Feature(
        ee.Geometry.Point([-122.204, 37.222]),
        {
            'id': 1,
            'cover_class': 'forest',
            'id': 1,
            'cover_class': 'forest',
        },
    ),
    ee.Feature(
        ee.Geometry.Point([-122.110, 37.199]),
        {
            'id': 2,
            'cover_class': 'forest',
            'id': 2,
            'cover_class': 'forest',
        },
    ),
])

# FeatureCollection of points representing urban cover.
fc_urban = ee.FeatureCollection([
    ee.Feature(
        ee.Geometry.Point([-121.953, 37.372]),
        {'id': 0, 'cover_class': 'urban', 'id': 0, 'cover_class': 'urban'},
    ),
    ee.Feature(
        ee.Geometry.Point([-121.861, 37.308]),
        {'id': 1, 'cover_class': 'urban', 'id': 1, 'cover_class': 'urban'},
    ),
    ee.Feature(
        ee.Geometry.Point([-121.984, 37.372]),
        {'id': 2, 'cover_class': 'urban', 'id': 2, 'cover_class': 'urban'},
    ),
])

# Merge the two FeatureCollections into one.
fc_merged = fc_forest.merge(fc_urban)

# Display FeatureCollections on the map.
m = geemap.Map()
m.set_center(-122.034, 37.296, 11)
m.add_layer(fc_forest, {'color': 'green'}, 'Forest points')
m.add_layer(fc_urban, {'color': 'grey'}, 'Urban points')
m.add_layer(fc_merged, {'color': 'yellow'}, 'Protected areas merged')
m