In this recipe, we will see what geospatial queries are and then see how to apply these queries on flat planes. We will put it to use in a test map application.

Geospatial queries can be executed on data in which geospatial indexes are created. There are two types of geospatial indexes. The first one, called 2D indexes, is the simpler of the two. It assumes that the data is given as x,y coordinates. The second one. called 3D or spherical indexes, is relatively more complicated. In this recipe, we will explore 2D indexes and execute some queries on 2D data. The data on which we are going to work is a 25 X 25 grid with some coordinates representing bus stops, restaurants, hospitals, and gardens.