Google Earth Engine（gee）中的Geometry

柔光的暖阳◎ 2021-09-03 09:31 553阅读 0赞

**目录**

点：ee.Geometry.Point()

多点：ee.Geometry.MultiPoint()

线：ee.Geometry.LineString()

多线：ee.Geometry.MultiLineString()

单闭合线：ee.Geometry.LinearRing()

多闭合线：ee.Geometry.MultiLineString()

ee.Geometry()

面：ee.Geometry.Polygon()

多面：ee.GeometryMultiPolygon()

矩形：ee.Geometry.Rectangle()

投影转换：ee.Geometry.transform()

获取中心：Geometry.centroid()

简化geometry：Geometry.simplify()

获取包络线和外接多边形：Geometry.bounds()、Geometry.convexHull()

获取缓冲区：Geometry.buffer()

多边形求并、求交、交集取反：Geometry.union()、Geometry.intersection()、Geometry.symmetricDifference()

Geometry.geometries()

多边形分别计算面积和周长：Geometry.area()、Geometry.perimeter()

多个多变形之间距离量算：Geometry.distance()

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

## 点：ee.Geometry.Point() ##

![20201123205930674.png][]

## 多点：ee.Geometry.MultiPoint() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70][]

## 线：ee.Geometry.LineString() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 1][]

## 多线：ee.Geometry.MultiLineString() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 2][]

## 单闭合线：ee.Geometry.LinearRing() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 3][]

注意：这里是1个环，为LinearRing。如果有两个环的话，就应该是MultiLineString了

## 多闭合线：ee.Geometry.MultiLineString() ##

## ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 4][] ##

## ee.Geometry() ##

![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][]

## 面：ee.Geometry.Polygon() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 7][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 8][]

## 多面：ee.GeometryMultiPolygon() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 9][]

## 矩形：ee.Geometry.Rectangle() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 10][]

## 投影转换：ee.Geometry.transform() ##

ee.ErrorMargin(100)：允许最大误差为100m

ee.Geometry(China\_Geo, null, false)：第二个参数让它为null就行；第三个参数默认为true，表示以地理坐标系的形式显示，如果为false，则以投影坐标系的形式显示

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 11][]

![20201123233118131.png][]![20201123233139414.png][]![20201123233201309.png][]

## 获取中心：Geometry.centroid() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 12][]

这里需要指出的是，不要在投影坐标系上使用这个centroid（）函数，否则报错。如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 13][]

## 简化geometry：Geometry.simplify() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 14][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 15][]

## 获取包络线和外接多边形：Geometry.bounds()、Geometry.convexHull() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 16][]

![20201124010800577.png][]![20201124010749320.png][]![20201124010739814.png][]

var sichuan = ee.FeatureCollection("users/lcljv1066965/test/sichuan");
    
    var sichuan_bounds=sichuan.geometry().bounds()
    var sichuan_convexHull=sichuan.geometry().convexHull()
    
    Map.centerObject(sichuan )
    
    Map.addLayer(sichuan,{},"sichuan")
    Map.addLayer(sichuan_bounds,{},"sichuan_bounds")
    Map.addLayer(sichuan_convexHull,{},"sichuan_convexHull")
    
    print(sichuan)
    print(sichuan_bounds)
    print(sichuan_convexHull)

## 获取缓冲区：Geometry.buffer() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 17][]

## 多边形求并、求交、交集取反：Geometry.union()、Geometry.intersection()、Geometry.symmetricDifference() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 18][]

![20201124002415284.png][]![20201124002437886.png][]![20201124002452948.png][]

## Geometry.geometries() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 19][]

## 多边形分别计算面积和周长：Geometry.area()、Geometry.perimeter() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 20][]

## 多个多变形之间距离量算：Geometry.distance() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 21][]

参考：[https://blog.csdn.net/qq\_40691254/article/details/107660824][https_blog.csdn.net_qq_40691254_article_details_107660824]

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[https_blog.csdn.net_qq_40691254_article_details_107660824]: https://blog.csdn.net/qq_40691254/article/details/107660824