This topic describes how to load a vector data file to Ganos by using shp2pgsql, ogr2gr, or QGIS.
Before you load a vector data file, the following command is run on your RDS instance to create the ganos_raster extension:
CREATE EXTENSION Ganos_Raster CASCADE
Load vector data by using shp2pgsql
The shp2pgsql command line tool is used to convert Esri shapefiles into SQL files. For more information, see shp2pgsql. Then, you can load the SQL files into Ganos.
shp2pgsql -s <srid> -c -W <charset> <path_to_shpfile> <schema>.<table_name> | psql -d <dbname> -h <host> -U <user_name> -p <port>
Parameter Description Example -s <srid> Specifies the spatial reference system identifier (SRID) of the vector data file. 4490 -c Specifies to create a table.You can also use the following parameters:
- -a: appends data to a table.
- -d: deletes a table before data is loaded.
- -p: creates a schema in SQL without writing spatial data.
None -W <charset> The character set that is used by the shapefile. GBK | UTF8 <path_to_shpfile> The save path of the shapefile. The save path must be accessible to the shp2pgsql command line tool. /home/roads.shp <schema>.<table_name> The name of the geometry table that you created. public.roads -d <dbname> The name of the database. mydb -h <host> The host that houses the RDS instance on which the database is created. pgm-xxxxxxx.pg.rds.aliyuncs.com -U <user_name> The username that is used to connect to the database. my_name -p <port> The port number that is used to connect to the database. 3433
shp2pgsql -s 4490 -c -W "GBK" /home/roads.shp public.roads | psql -d mydb -h pgm-xxxxxxx.pg.rds.aliyuncs.com -U my_name -p 3433Note If you want to import more than one vector data file at a time by using a script, run the
export PGPASSWORD=my_passcommand to set the PGPASSWORD environment variable to my_pass.
Load vector data by using ogr2ogr
The ogr2ogr command line tool is provided by GDAL/OGR to convert data. It supports common vector data types, such as Esri ShapFile, MapInfo, and FileGDB. For more information, see ogr2ogr. For more information, visit Vector drivers.
ogr2ogr -nln <table_name> -f PostgreSQL PG:"dbname='<dbname>' host='<host>' port='<port>' user='<user_name>' password='<password>'" -lco SPATIAL_INDEX=GIST -lco FID=<FID_NAME> -overwrite "<PATH_TO_FILE>" -nlt GEOMETRY
Parameter Description Example -nln <table_name> The name of the vector data file. roads -f PostgreSQL PG:"dbname='<dbname>' host='<host>' port='<port>' user='<user_name>' password='<password>'" The information that is used to connect to the ApsaraDB RDS for PostgreSQL instance on which the database is connected. dbname='mydb' host='pgm-xxxxxxx.pg.rds.aliyuncs.com' port='3433' user='my_name' password='my_pass' -lco SPATIAL_INDEX=GIST The GiST spatial index that you want to create. None -lco FID=<FID_NAME> The ID of the specified feature. fid -overwrite The rewrite mode that you want to use.
You can also select the -append mode.
None <PATH_TO_FILE> The save path of the vector data file. Make sure that the save path is accessible to the ogr2gr command line tool. /home/roads.shp
-nlt GEOMETRY Specifies the geometry data type. If the vector data file contains polygon data, we recommend that you specify this parameter. This allows you to avoid errors that occur if the vector data file contains not only data of the MultiPolygon type but also data of other types. None
ogr2ogr -nln roads -f PostgreSQL PG:"dbname='mydb' host='pgm-xxxxxxx.pg.rds.aliyuncs.com' port='3433' user='my_name' password='my_pass'" -lco SPATIAL_INDEX=GIST -lco FID=fid -overwrite "/home/roads.shp" -nlt GEOMETRY
Load vector data by using QGIS
QGIS was known as Quantum GIS. It is a user-friendly, open-source desktop tool that supports various vector and raster formats. It allows you to use databases as data sources. In addition, it allows you to visualize, manage, and analyze data and to prepare maps. For more information, see QGIS.
- Establish a connection to Ganos.
- In the right-side Browser pane, create a PostGIS connection.
- Configure the required parameters.
The following table describes the parameters.
Parameter Description Name The name of the connection. Host The IP address of your ECS instance or the public endpoint of your RDS instance or PolarDB cluster. You can obtain this information from the Alibaba Cloud Management Console. Port The port number of your ECS instance, RDS instance, or PolarDB cluster. You can obtain this information from the Alibaba Cloud Management Console. Database The name of the database. SSL Mode Specifies whether to establish an encrypted connection based on SSL.
- Click Test Connection. Then, wait until the connection is established.
- Load the vector data file.
- In the menu bar, choose .
- In the dialog box that appears, select the data source from which you want to import the vector data file, and click Import Layer/File.
- In the dialog box that appears, click the vector data file, configure the required parameters, and then click OK.