Querying geospatial data in PostGIS involves using SQL statements to retrieve and analyze spatial information stored in a PostgreSQL database with the PostGIS extension. PostGIS is an extension for PostgreSQL that adds support for geographic objects, allowing for the storage and querying of spatial data.

• geographybasic: This file provides a basic introduction to geospatial concepts and the use of PostGIS for handling geographic data.

• installation_of_postgis: Here, you will find instructions for installing and setting up PostGIS, ensuring you have the necessary tools to work with geospatial data.

• loading_of_sql_data: This tells how to load SQL data into your PostGIS-enabled PostgreSQL database. This step is crucial for setting up the foundation for spatial queries.

• importing_file_using_shp2pgsql: This will walks you through the process of importing shapefiles into your PostGIS database using the shp2pgsql tool. Shapefiles are a common geospatial vector data format.

• Roads: Real world example using roads network data. This demonstrates how to perform spatial queries on real-world datasets gain hands-on experience with PostGIS.

• cb_2017_us_state_20m: Explore practical examples using U.S. state data.

1. Geography Basic:

   • The geographybasic file is to understand fundamental geospatial concepts.

2. Installation of PostGIS:

   • The instructions in the installation_of_postgis file is used to set up PostGIS in your PostgreSQL database.

3. Loading of SQL Data:

   • Used loading_of_sql_data for loading SQL data into your PostGIS-enabled database.

4. Importing File Using shp2pgsql:

   • Import shapefiles into your database using the shp2pgsql tool with the help of the importing_file_using_shp2pgsql file.

5. Real world- Spatial Data Analysis:

   • Practical examples with real datasets in the roads and us_state_data file. This demonstrates how to query road and U.S. state data, providing valuable insights into geospatial data handling.