This lesson shows you how to project data into a spatial reference system that uses the flat-Earth model so that you can calculate area and distance measurements.
This lesson assumes you have completed all preceding lessons. See Lesson 1: Install additional units of measure and spatial reference systems.
This lesson assumes you have the roles and privileges listed in the Privileges section at the start of this tutorial: Tutorial: Experimenting with the spatial features.
The spatial values in Massdata were assigned SRID 4269 (NAD83 spatial reference system) when you loaded the data into the database from the ESRI shapefile. SRID 4269 is a round-Earth spatial reference system. However, calculations such as the area of geometries and some spatial predicates are not supported in the round-Earth model. If your data is currently associated with a round-Earth spatial reference system, you can create a new spatial column that projects the values into a flat-Earth spatial reference system, and then perform your calculations on that column.
You have finished the tutorial.