Horizontal datums are used for describing a point on the earth 's surface, in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths. In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made.orizontal datums are used for describing a point on the earth 's surface, in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths. In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made.
There are 25 known species of pythons in the world. Like all snakes, pythons are cold blooded. Pythons are not venomous; they kill their prey by constriction. Some of the different types of pythons are the reticulated python, the ball python, the Burmese python, the green tree python, and the carpet python. While some of these species should not be held captive by a non-professional, other types of pythons can make good pets.
When getting your first snake, its a good idea to start with a common species that is smaller in size. Some popular common snakes of this sort include the king snake, corn snake, garter snake, rat snake, milksnake and ball python.here is a wide variety of non-venomous snakes to choose from for a pet. The list of Snakes below includes popular pets as well lesser known species and venomous snakes. Each snake guide provides snake identification, snake pictures, in-depth species information, and information about living with them.