I have some shapefiles that I am reading and then loading into tables in the database. The shapefiles with no zoom (eg. "au_postcode") have no shapes with type null. When I tried to load a shapefile with zoom (eg. "au_postcode_100"), I saw some null shapes.
It would be great if someone can please explain to me how the null shapes work and why would a shape file be null. It is confusing because to me a shape is at least a point and if there is a physical location, there would be a shape for it.
I am new to GIS and if something in this question does not make sense or I've used the wrong terminology, please let me know.