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.
1 Burmese Python. 2  One of the larger species of snakes in the world is the Burmese Python. 3  It is ranked as the #6 largest of all snakes in the world. 4  Ball Python or Royal Python. 5  The Ball Python or Royal Python is one that many people are fascinated by. 6  This is a non venomous type of snake.nake Species Index. 1  Snake Species. 2  With more then 3,000 species of snakes in the world there is plenty to learn about them. 3  Even though they all have many unique characteristics about them, there are quite a few similarities. 4  King Cobra. 5  The longest venomous snake in the world is the King Cobra.