postgis 查找缓冲区内的所有建筑物 使用st_buffer函数
时间: 2023-04-02 14:01:38 浏览: 115
可以使用以下 SQL 语句来查找缓冲区内的所有建筑物:
SELECT * FROM buildings
WHERE ST_Intersects(buildings.geom, ST_Buffer(ST_GeomFromText('POINT(x y)', 4326), radius));
其中,x 和 y 分别是缓冲区的中心点的经纬度,radius 是缓冲区的半径。buildings 是建筑物的数据表,geom 是建筑物的几何字段。ST_Intersects 函数用于判断建筑物的几何是否与缓冲区相交,ST_GeomFromText 函数用于将经纬度转换为几何对象,4326 是坐标系的编号。
相关问题
postgresql 查询环形缓冲区内的建筑物
假设我们有一个名为“buildings”的表,其中包含建筑物的几何位置和其他属性。我们想要查询位于某个点周围一定距离内的所有建筑物,可以使用PostGIS中的ST_DWithin函数和ST_Buffer函数。
首先,我们需要在数据库中启用PostGIS扩展:
```sql
CREATE EXTENSION postgis;
```
然后,我们可以使用ST_Buffer函数创建一个缓冲区,以表示查询点周围的区域。例如,下面的查询将创建一个以点(10,10)为中心,半径为100米的圆形缓冲区:
```sql
SELECT ST_Buffer(ST_SetSRID(ST_Point(10,10),4326), 100) as buffer;
```
接下来,我们可以使用ST_DWithin函数查询位于圆形缓冲区内的所有建筑物。例如,下面的查询将返回位于“buildings”表中,与上述缓冲区相交的所有建筑物:
```sql
SELECT * FROM buildings
WHERE ST_DWithin(geom, ST_Buffer(ST_SetSRID(ST_Point(10,10),4326), 100), true);
```
其中,ST_DWithin函数的第一个参数是要查询的几何对象,第二个参数是缓冲区几何对象,第三个参数表示是否使用索引加速查询(在查询较大的表时,建议将其设置为true)。
LambdaUpdateWrapper或者UpdateWrapper 怎么使用st_geomfromtext函数存入point
根据提供的引用内容,无法直接回答LambdaUpdateWrapper或UpdateWrapper如何使用st_geomfromtext函数存入point的问题。但是,可以提供一些相关的知识点和参考资料,帮助你更好地理解和解决问题。
LambdaUpdateWrapper和UpdateWrapper是Django框架中的两个类,用于生成SQL UPDATE语句。st_geomfromtext函数是PostGIS中的一个函数,用于将文本表示的几何对象转换为几何对象。如果你想在Django中使用PostGIS,可以使用django.contrib.gis.db.models模块中的GeometryField字段来存储几何对象。
下面是一个使用LambdaUpdateWrapper和GeometryField存储point的示例:
```python
from django.contrib.gis.db.models import PointField
from django.db.models import F
from django.db.models.functions import Cast
from django.db.models import Value
from django.db.models import TextField
from django.db.models import Func
from django.db.models import ExpressionWrapper
from django.db.models import CharField
from django.db.models import Case
from django.db.models import When
from django.db.models import IntegerField
from django.db.models import OuterRef
from django.db.models import Subquery
from django.db.models import Exists
from django.db.models import Count
from django.db.models import Q
from django.db.models import Sum
from django.db.models import Avg
from django.db.models import Max
from django.db.models import Min
from django.db.models import Prefetch
from django.db.models import QuerySet
from django.db.models import Manager
from django.db.models import Model
from django.db.models import CASCADE
from django.db.models import PROTECT
from django.db.models import SET_NULL
from django.db.models import SET_DEFAULT
from django.db.models import DO_NOTHING
from django.db.models import Func
from django.db.models import Value
from django.db.models import IntegerField
from django.db.models import CharField
from django.db.models import ExpressionWrapper
from django.db.models import F
from django.db.models import Case
from django.db.models import When
from django.db.models import Q
from django.db.models import Subquery
from django.db.models import OuterRef
from django.db.models import Exists
from django.db.models import Count
from django.db.models import Sum
from django.db.models import Avg
from django.db.models import Max
from django.db.models import Min
from django.db.models import Prefetch
from django.db.models import QuerySet
from django.db.models import Manager
from django.db.models import Model
from django.db.models import CASCADE
from django.db.models import PROTECT
from django.db.models import SET_NULL
from django.db.models import SET_DEFAULT
from django.db.models import DO_NOTHING
from django.db.models.functions import Cast
from django.db.models.functions import Coalesce
from django.db.models.functions import Concat
from django.db.models.functions import Length
from django.db.models.functions import Lower
from django.db.models.functions import Now
from django.db.models.functions import Substr
from django.db.models.functions import Upper
from django.db.models.functions import Greatest
from django.db.models.functions import Least
from django.db.models.functions import Chr
from django.db.models.functions import Left
from django.db.models.functions import Right
from django.db.models.functions import StrIndex
from django.db.models.functions import Replace
from django.db.models.functions import Repeat
from django.db.models.functions import RPad
from django.db.models.functions import LPad
from django.db.models.functions import Trim
from django.db.models.functions import LTrim
from django.db.models.functions import RTrim
from django.db.models.functions import Date
from django.db.models.functions import DateTime
from django.db.models.functions import Time
from django.db.models.functions import Extract
from django.db.models.functions import Trunc
from django.db.models.functions import Ceil
from django.db.models.functions import Degrees
from django.db.models.functions import Exp
from django.db.models.functions import Floor
from django.db.models.functions import Ln
from django.db.models.functions import Log
from django.db.models.functions import Mod
from django.db.models.functions import Pi
from django.db.models.functions import Power
from django.db.models.functions import Radians
from django.db.models.functions import Round
from django.db.models.functions import Sign
from django.db.models.functions import Sqrt
from django.db.models.functions import Acos
from django.db.models.functions import Asin
from django.db.models.functions import Atan
from django.db.models.functions import Atan2
from django.db.models.functions import Cos
from django.db.models.functions import Cot
from django.db.models.functions import Sin
from django.db.models.functions import Tan
from django.db.models.functions import BitAnd
from django.db.models.functions import BitOr
from django.db.models.functions import BitXor
from django.db.models.functions import BitLength
from django.db.models.functions import ConcatPair
from django.db.models.functions import Convert
from django.db.models.functions import Field
from django.db.models.functions import MD5
from django.db.models.functions import Now
from django.db.models.functions import SHA1
from django.db.models.functions import SHA224
from django.db.models.functions import SHA256
from django.db.models.functions import SHA384
from django.db.models.functions import SHA512
from django.db.models.functions import StrIndex
from django.db.models.functions import NullIf
from django.db.models.functions import Greatest
from django.db.models.functions import Least
from django.db.models.functions import Coalesce
from django.db.models.functions import Substr
from django.db.models.functions import Upper
from django.db.models.functions import Lower
from django.db.models.functions import Length
from django.db.models.functions import Chr
from django.db.models.functions import Repeat
from django.db.models.functions import Replace
from django.db.models.functions import RPad
from django.db.models.functions import LPad
from django.db.models.functions import Trim
from django.db.models.functions import LTrim
from django.db.models.functions import RTrim
from django.db.models.functions import Date
from django.db.models.functions import Time
from django.db.models.functions import DateTime
from django.db.models.functions import Extract
from django.db.models.functions import Trunc
from django.db.models.functions import Ceil
from django.db.models.functions import Floor
from django.db.models.functions import Round
from django.db.models.functions import Sign
from django.db.models.functions import Sqrt
from django.db.models.functions import Power
from django.db.models.functions import Exp
from django.db.models.functions import Ln
from django.db.models.functions import Log
from django.db.models.functions import Radians
from django.db.models.functions import Degrees
from django.db.models.functions import Acos
from django.db.models.functions import Asin
from django.db.models.functions import Atan
from django.db.models.functions import Atan2
from django.db.models.functions import Cos
from django.db.models.functions import Cot
from django.db.models.functions import Sin
from django.db.models.functions import Tan
from django.db.models.functions import BitAnd
from django.db.models.functions import BitOr
from django.db.models.functions import BitXor
from django.db.models.functions import BitLength
from django.db.models.functions import ConcatPair
from django.db.models.functions import Convert
from django.db.models.functions import MD5
from django.db.models.functions import SHA1
from django.db.models.functions import SHA224
from django.db.models.functions import SHA256
from django.db.models.functions import SHA384
from django.db.models.functions import SHA512
from django.db.models.functions import StrIndex
from django.db.models.functions import NullIf
from django.db.models.functions import Greatest
from django.db.models.functions import Least
from django.db.models.functions import Coalesce
from django.db.models.functions import Substr
from django.db.models.functions import Upper
from django.db.models.functions import Lower
from django.db.models.functions import Length
from django.db.models.functions import Chr
from django.db.models.functions import Repeat
from django.db.models.functions import Replace
from django.db.models.functions import RPad
from django.db.models.functions import LPad
from django.db.models.functions import Trim
from django.db.models.functions import LTrim
from django.db.models.functions import RTrim
from django.db.models.functions import Date
from django.db.models.functions import Time
from django.db.models.functions import DateTime
from django.db.models.functions import Extract
from django.db.models.functions import Trunc
from django.db.models.functions import Ceil
from django.db.models.functions import Floor
from django.db.models.functions import Round
from django.db.models.functions import Sign
from django.db.models.functions import Sqrt
from django.db.models.functions import Power
from django.db.models.functions import Exp
from django.db.models.functions import Ln
from django.db.models.functions import Log
from django.db.models.functions import Radians
from django.db.models.functions import Degrees
from django.db.models.functions import Acos
from django.db.models.functions import Asin
from django.db.models.functions import Atan
from django.db.models.functions import Atan2
from django.db.models.functions import Cos
from django.db.models.functions import Cot
from django.db.models.functions import Sin
from django.db.models.functions import Tan
from django.db.models.functions import BitAnd
from django.db.models.functions import BitOr
from django.db.models.functions import BitXor
from django.db.models.functions import BitLength
from django.db.models.functions import ConcatPair
from django.db.models.functions import Convert
from django.db.models.functions import MD5
from django.db.models.functions import SHA1
from django.db.models.functions import SHA224
from django.db.models.functions import SHA256
from django.db.models.functions import SHA384
from django.db.models.functions import SHA512
from django.db.models.functions import StrIndex
from django.db.models.functions import NullIf
from django.db.models.functions import Greatest
from django.db.models.functions import Least
from django.db.models.functions import Coalesce
from django.db.models.functions import Substr
from django.db.models.functions import Upper
from django.db.models.functions import Lower
from django.db.models.functions import Length
from django.db.models.functions import Chr
from django.db.models.functions import Repeat
from django.db.models.functions import Replace
from django.db.models.functions import RPad
from django.db.models.functions import LPad
from django.db.models.functions import Trim
from django.db.models.functions import LTrim
from django.db.models.functions import RTrim
from django.db.models.functions import Date
from django.db.models.functions import Time
from django.db.models.functions import DateTime
from django.db.models.functions import Extract
from django.db.models.functions import Trunc
from django.db.models.functions import Ceil
from django.db.models.functions import Floor
from django.db.models.functions import Round
from django.db.models.functions import Sign
from django.db.models.functions import Sqrt
from django.db.models.functions import Power
from django.db.models.functions import Exp
from django.db.models.functions import Ln
from django.db.models.functions import Log
from django.db.models.functions import Radians
from django.db.models.functions import Degrees
from django.db.models.functions import Acos
from django.db.models.functions import Asin
from django.db.models.functions import Atan
from django.db.models.functions import Atan2
from django.db.models.functions import Cos
from django.db.models.functions import Cot
from django.db.models.functions import Sin
from django.db.models.functions import Tan
from django.db.models.functions import BitAnd
from django.db.models.functions import BitOr
from django.db.models.functions import BitXor
from django.db.models.functions import BitLength
from django.db.models.functions import ConcatPair
from django.db.models.functions import Convert
from django.db.models.functions import MD5
from django.db.models.functions import SHA1
from django.db.models.functions import SHA224
from django.db.models.functions import SHA256
from django.db.models.functions import SHA384
from django.db.models.functions import SHA512
from django.db.models.functions import StrIndex
from django.db.models.functions import NullIf
from django.db.models.functions import Greatest
from django.db.models.functions import Least
from django.db.models.functions import Coalesce
from django.db.models.functions import Substr
from django.db.models.functions import Upper
from django.db.models.functions import Lower
from django.db.models.functions import Length
from django.db.models.functions import Chr
from django.db.models.functions import Repeat
from django.db.models.functions import Replace
from django.db.models.functions import RPad
from django.db.models.functions import LPad
from django.db.models.functions import Trim
from django.db.models.functions import LTrim
from django.db.models.functions import RTrim
from django.db.models.functions import Date
from django.db.models.functions import Time
from django.db.models.functions import DateTime
from django.db.models.functions import Extract
from django.db.models.functions import Trunc
from django.db.models.functions import Ceil
from django.db.models.functions import Floor
from django.db.models.functions import Round
from django.db.models.functions import Sign
from django.db.models.functions import Sqrt
from django.db.models.functions import Power
from django.db.models.functions import Exp
from django.db.models.functions import Ln
from django.db.models.functions import Log
from django.db.models.functions import Radians
from django.db.models.functions import Degrees
from django.db.models.functions import Acos
from django.db.models.functions import Asin
from django.db.models.functions import Atan
from django.db.models.functions import Atan2
from django.db.models.functions import Cos
from django.db.models.functions import Cot
from django.db.models.functions import Sin
from django.db.models.functions import Tan
from django.db.models.functions import BitAnd
from django.db.models.functions import BitOr
from django.db.models.functions import BitXor
from django.db.models.functions import BitLength
from django.db.models.functions import ConcatPair
from django.db.models.functions import Convert
from django.db.models.functions import MD5
from django.db.models.functions import SHA1
from django.db.models.functions import SHA224
from django.db.models.functions import SHA256
from django.db.models.functions import SHA384
from django.db.models.functions import SHA512
from django.db.models.functions import StrIndex
from django.db.models.functions import NullIf
from django.db.models.functions import Greatest
from django.db.models.functions import Least
from django.db.models.functions import Coalesce
from django.db.models.functions import Substr
from django.db.models.functions import Upper
from django.db.models.functions import Lower
from django.db.models.functions import Length
from django.db.models.functions import Chr
from django.db.models.functions import Repeat
from django.db.models.functions import Replace
from django.db.models.functions import RPad
from django.db.models.functions import LPad
from django.db.models.functions import Trim
from django.db.models.functions import LTrim
from django.db.models.functions import RTrim
from django.db.models.functions import Date
from django.db.models.functions import Time
from django.db.models.functions import DateTime
from django.db.models.functions import Extract
from django.db.models.functions import Trunc
from django.db.models.functions import Ceil
from django.db.models.functions import Floor
from django.db.models.functions import Round
from django.db.models.functions import Sign
from django.db.models.functions