## What are geocentric coordinates?

The Earth-centered, Earth-fixed coordinate system (acronym ECEF), also known as the Geocentric coordinate system, is a cartesian spatial reference system that represents locations in the vicinity of the Earth (including its surface, interior, atmosphere, and surrounding outer space) as X, Y, and Z measurements from its …

### How are coordinates represented?

Coordinates are pairs (X, Y) in a two-dimensional space referenced to a horizontal datum. Whereas triplets (X, Y, Z) of points not only has a position but also has height referenced to a vertical datum. In other words, the X- and Y-values represent a horizontal position.

#### What are longitude and latitude coordinates called?

Parallels
Merdians and Parallels You’ve seen lines running across maps your whole life and may not have noticed them. The lines running North to South are called “Meridians” or “lines of longitude” (Figure 2), while the lines running East to West are called “Parallels” or “lines of latitude” (Figure 3).

What is latitude in astronomy?

Definition of astronomical latitude : the angle between the plane of the earth’s equator and the plumb line (direction of gravity) at a given point on the earth’s surface — compare terrestrial latitude.

What is coordinates in survey?

coordinates, geodetic—The quantities of latitude and longitude which define the position of a point on the surface of the Earth with respect to the reference ellipsoid. Also called “geographic coordinates.”

## What are coordinates also called?

The Cartesian coordinates (also called rectangular coordinates) of a point are a pair of numbers (in two-dimensions) or a triplet of numbers (in three-dimensions) that specified signed distances from the coordinate axis.

### How do you find the spherical geocentric coordinates?

The geodetic coordinates ( h, α, ϕ ), where h is altitude, α is geodetic latitude, and ϕ is longitude, are transformed into the spherical geocentric coordinates ( r, θ, ϕ) by means of.  cot θ = h a 2 cos 2 α + b 2 sin 2 α + b 2 h a 2 cos 2 α + b 2 sin 2 α + a 2 tan α.

#### What is the difference between geocentric and geodetic coordinates?

The difference between geocentric and geodetic coordinates lies in the definition of latitude : In geocentric coordinates latitude is the angle between the equatorial plane and the line crossing through the earth’s center and the point designated by the coordinates.

What are the different coordinate systems at the center of the Earth?

The following coordinate systems at the centre of the Earth. 1. Systems based on the Earth’s rotation axis 1.1 Geographic (GEO) This system has its Z axis parallel to the Earth’s rotation axis (positive to the North) and its X axis towards the intersection of the Equator and the Greenwich Meridian.

What is the difference between geodetic and spherical coordinates?

The geodetic coordinates ( h, α, ϕ ), where h is altitude, α is geodetic latitude, and ϕ is longitude, are transformed into the spherical geocentric coordinates ( r, θ, ϕ) by means of