Google Earth Engine（gee）中的FeatureCollection

落日映苍穹つ 2021-07-25 11:05 1457阅读 0赞

**目录**

基本结构

FeatureCollection.geometry()

生成随机点：FeatureCollection.randomPoints（）

FeatureCollection中limit（）、sort（）

FeatureCollection中的filterBounds()、filterMetadata（）

FeatureCollection中的first（）、select（）

FeatureCollection.union()

FeatureCollection.merge()

FeatureCollection中的get、set、setMulti

矢量转栅格：FeatureCollection.reduceToImage()

FeatureCollection.toList()

Feature Collection属性统计命令:Feature Collection.aggregate\_array()等

Feature Collection.map()

--------------------

## 基本结构 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70][]

## FeatureCollection.geometry() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 1][]

## 生成随机点：FeatureCollection.randomPoints（） ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 2][]

## FeatureCollection中limit（）、sort（） ##

参数中true表示升序，false表示降序

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 4][]

var fc_sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    
    print("fc_sichuan",fc_sichuan)
    print("fc_sichuan.limit(1)",fc_sichuan.limit(1))
    print("subFeature_asc",fc_sichuan.limit(3,'subFeature',true))
    print("sort_asc",fc_sichuan.sort('subFeature',true).limit(3))

## FeatureCollection中的filterBounds()、filterMetadata（） ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 5][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 6][]

var fc_sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    
    Map.centerObject(fc_sichuan)
    
    Map.addLayer(fc_sichuan)
    Map.addLayer(fc_sichuan.filterBounds(ee.Geometry.Point([104.091,30.598])),{color:'FF0000'})
    Map.addLayer(fc_sichuan.filterMetadata('name','equals','绵阳市'),{color:'FFF000'})

## FeatureCollection中的first（）、select（） ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 7][]

var fc_sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    print(fc_sichuan.first())
    print(fc_sichuan.limit(3).select(['name','adcode']))

## FeatureCollection.union() ##

union：联合。其效果是形成一个单独的Feature，并且抹去所有属性

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 8][]

![20201126221621193.png][]![20201126221605906.png][]

## FeatureCollection.merge() ##

合并：将两个数据集合并起来

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 9][]

![2020112622354252.png][]![20201126223556182.png][]![20201126223611986.png][]

var fc_sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    var chengdu=fc_sichuan.filterMetadata('name','equals','成都市')
    var deyang=fc_sichuan.filterMetadata('name','equals','德阳市')
    
    Map.centerObject(fc_sichuan)
    
    Map.addLayer(fc_sichuan,{},"fc_sichuan")
    Map.addLayer(chengdu,{color:'FF0000'},"chengdu")
    Map.addLayer(deyang,{color:'FFF000'},"deyang")
    Map.addLayer(chengdu.merge(deyang),{color:'00ff00'},"merge")
    
    print(chengdu)
    print(deyang)
    print(chengdu.merge(deyang))

## FeatureCollection中的get、set、setMulti ##

在使用set时，如果属性没有，则添加；如果有，则更新

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 10][]

var fc =ee.FeatureCollection(ee.Geometry.Point([95.169, 34.513]));
          
    print(fc)
    print(fc.set('create','lijiang'))
    print(fc.set('create','lijiang').get('create'))
    print(ee.FeatureCollection(fc.set('create','lijiang')).set('create','xiaoming'))
    print(fc.setMulti({"create":"lijiang","age":22}))

## 矢量转栅格：FeatureCollection.reduceToImage() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 11][]

![20201126232535164.png][]![20201126232546533.png][]

var fc_sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    
    var sichuan_toImage=fc_sichuan.reduceToImage(['subFeature'],ee.Reducer.first())
    
    Map.centerObject(fc_sichuan)
    Map.addLayer(fc_sichuan,{},"fc_sichuan")
    Map.addLayer(sichuan_toImage,{"min":1,"max":30,"palette":["ff9c07","f0ff1b","1aff0b"]},"sichuan_toImage")
    
    print("fc_sichuan",fc_sichuan)
    print("sichuan_toImage",sichuan_toImage)

## FeatureCollection.toList() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 12][]

var fc_sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    
    print("fc_sichuan",fc_sichuan)
    print(fc_sichuan.toList(5))
    print(fc_sichuan.toList(5).get(0))

## Feature Collection属性统计命令:Feature Collection.aggregate\_array()等 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 13][]

var fc_sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    
    print(fc_sichuan)
    print(fc_sichuan.aggregate_array("subFeature"))
    print(fc_sichuan.aggregate_stats("subFeature"))
    print("aggregate_first",fc_sichuan.aggregate_first("subFeature"))
    print("aggregate_max",fc_sichuan.aggregate_max("subFeature"))
    print("aggregate_count",fc_sichuan.aggregate_count("subFeature"))

下边是GEE中Feature Collection相关的属性统计命令：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 14][]

## Feature Collection.map() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 15][]

var fc_sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    
    function Add_Center (feature){
      return feature.centroid()
    }
    
    print("fc_sichuan",fc_sichuan.limit(3))
    print("fc_sichuan.map(Add_Center)",fc_sichuan.map(Add_Center).limit(3))
    
    Map.centerObject(fc_sichuan)
    Map.addLayer(fc_sichuan)
    Map.addLayer(fc_sichuan.map(Add_Center),{color:'ff0000'})

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[20201126221621193.png]: https://img-blog.csdnimg.cn/20201126221621193.png
[20201126221605906.png]: https://img-blog.csdnimg.cn/20201126221605906.png
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[2020112622354252.png]: https://img-blog.csdnimg.cn/2020112622354252.png
[20201126223556182.png]: https://img-blog.csdnimg.cn/20201126223556182.png
[20201126223611986.png]: https://img-blog.csdnimg.cn/20201126223611986.png
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[20201126232535164.png]: https://img-blog.csdnimg.cn/20201126232535164.png
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