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.
Venemous snakes come from many different families, and thus, they have different body shapes and types and different head shapes as well. It is true that members of the Viper Family, Viperidae, have triangular shaped heads. These include rattlesnakes, adders, the fer-de-lance, bushmaster, asian vipers, and more. However, snakes of the Family Elapidae, such as cobras, mambas, Australian brown snakes, the Taipan, Tiger Snake, Sea Snakes, the American coral snake, do not have trianglar shaped heads.