To create a point, we need to provide its latitude and longitude:
RETURN point({latitude: 45, longitude: 3})
The point representation looks like this:
point({srid:4326, x:3, y:45}
You can recognize SRID 4326, meaning the coordinates are given in the GPS projection system. As I have already mentioned previously, the y coordinate holds the latitude, while the longitude is stored to the x coordinate.
We can also use the equivalent syntax by explicitly setting the srid and using the xy notation directly:
RETURN point({srid: 4326, y: 45, x: 3})
Be careful, however. If you omit the srid parameter in the preceding expression, the point will be interpreted as being in a Cartesian projection with SRID 7203. Creating a point in the Cartesian projection can be achieved with the following syntax:
RETURN point({y: 45, x: 3})
The previous query returns a totally different point:
point({srid:7203, x:3, y:45})
If you try to draw this point on a map, it will not be at latitude 45...
