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.
Types of Green Tree Pythons. One of the undeniable attractions of this beautiful species is the myriad of colour variations and combinations that can be seen. Adult colouration can include various shades of blue, yellow, black, white and green, while hatchlings or neonates can range from bright yellow to brown to rich, dark red and even black. The result is an almost endless array of different forms and stunning variety between individuals, commonly even within a clutch. Captive Green Tree Pythons can be broken down into two categories: Wild type or pure line animals (difficult to prove due to lack of records or proof of provenance)