PostGIS在哪里存储加载的shp2pgsql数据？

Question

当我安装PostGIS及其address_standardizer和postgis_tiger_geocoder扩展时，有许多表是用\dt创建的。这些表是做什么的，shp2pgsql在哪里加载shapefile？

为了显示这一点，一个空的数据库，首先有什么数据库？没什么，跟\dt确认一下。

testgis=# -- Enable PostGIS (as of 3.0 contains just geometry/geography)
CREATE EXTENSION postgis;
-- enable raster support (for 3+)
CREATE EXTENSION postgis_raster;
-- Enable Topology
CREATE EXTENSION postgis_topology;
-- Enable PostGIS Advanced 3D
-- and other geoprocessing algorithms
-- sfcgal not available with all distributions
CREATE EXTENSION postgis_sfcgal;
-- fuzzy matching needed for Tiger
CREATE EXTENSION fuzzystrmatch;
-- rule based standardizer
CREATE EXTENSION address_standardizer;
-- example rule data set
CREATE EXTENSION address_standardizer_data_us;
-- Enable US Tiger Geocoder
CREATE EXTENSION postgis_tiger_geocoder;
CREATE EXTENSION
CREATE EXTENSION
CREATE EXTENSION
ERROR:  can not open the control file of extension «/usr/share/postgresql-13/extension/postgis_sfcgal.control»: File does not exist
CREATE EXTENSION
CREATE EXTENSION
CREATE EXTENSION
CREATE EXTENSION

现在，请向\dt查询。

与postgres用户：

                  List of relations
 Schema |           Name           | Type  |  Owner   
--------+--------------------------+-------+----------
 public | spatial_ref_sys          | table | postgres
 public | us_gaz                   | table | postgres
 public | us_lex                   | table | postgres
 public | us_rules                 | table | postgres
 tiger  | addr                     | table | postgres
 tiger  | addrfeat                 | table | postgres
 tiger  | bg                       | table | postgres
 tiger  | county                   | table | postgres
 tiger  | county_lookup            | table | postgres
 tiger  | countysub_lookup         | table | postgres
 tiger  | cousub                   | table | postgres
 tiger  | direction_lookup         | table | postgres
 tiger  | edges                    | table | postgres
 tiger  | faces                    | table | postgres
 tiger  | featnames                | table | postgres
 tiger  | geocode_settings         | table | postgres
 tiger  | geocode_settings_default | table | postgres
 tiger  | loader_lookuptables      | table | postgres
 tiger  | loader_platform          | table | postgres
 tiger  | loader_variables         | table | postgres
 tiger  | pagc_gaz                 | table | postgres
 tiger  | pagc_lex                 | table | postgres
 tiger  | pagc_rules               | table | postgres
 tiger  | place                    | table | postgres
 tiger  | place_lookup             | table | postgres
 tiger  | secondary_unit_lookup    | table | postgres
 tiger  | state                    | table | postgres
 tiger  | state_lookup             | table | postgres
 tiger  | street_type_lookup       | table | postgres
 tiger  | tabblock                 | table | postgres
 tiger  | tract                    | table | postgres
 tiger  | zcta5                    | table | postgres
 tiger  | zip_lookup               | table | postgres
 tiger  | zip_lookup_all           | table | postgres
 tiger  | zip_lookup_base          | table | postgres
 tiger  | zip_state                | table | postgres
 tiger  | zip_state_loc            | table | postgres
(37 rows)

与普通用户：

            Listado de relaciones
 Esquema |     Nombre      | Tipo  |  Dueño   
---------+-----------------+-------+----------
 public  | spatial_ref_sys | tabla | postgres
 public  | us_gaz          | tabla | postgres
 public  | us_lex          | tabla | postgres
 public  | us_rules        | tabla | postgres
(4 filas)

Answer 1

默认情况下，shp2pgsql将为每个导入的shapefile创建一个表。但是，可以使用-a选项将多个shapefiles加载到同一个表中。

顾名思义，表spatial_ref_sys只保存空间参考系统的数据，这对于坐标转换等操作至关重要。

表us_gaz、us_lex和us_rules与扩展address_standardizer相关。

模式tiger中的其他表与扩展postgis_tiger_geocoder相关--也是不需要真正担心的系统表。