The geographic coordinate system (GCS) is a

**spherical or ellipsoidal coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude.**It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others.- Decimal Degrees
Decimal degrees (DD) is a notation for expressing latitude...

- Geodetic Coordinates
Geodetic coordinates are a type of curvilinear orthogonal...

- Decimal Degrees
A geographical coordinate system is a coordinate system. This means that

**every place can be specified by a set of three numbers, called coordinates.**A full circle can be divided into 360 degrees (or 360°); this was first done by the Babylonians; Ancient Greeks, like Ptolemy later extended the theory. Today, degrees are divided further.**Coordinate system**For geographical**coordinates**on**Wikipedia**, see Template:Coord. The spherical**coordinate system**is commonly used in physics. It assigns three numbers (known as**coordinates**) to every point in Euclidean space: radial distance r, polar angle θ ( theta ), and azimuthal angle φ ( phi ). The symbol ρ ( rho) is often used instead of r.The

**geographic coordinate system**is a spherical or ellipsoidal**coordinate****system**for measuring and communicating positions directly on the Earth as latitude and longitude.[1] It is the simplest, oldest and most widely used of the various spatial reference**systems**that are in use, and forms the basis for most others.A

**geographic****coordinate system**(GCS) uses a three-dimensional spherical surface to define locations on the earth. A GCS is often incorrectly called a datum, but a datum is only one part of a GCS. A GCS includes an angular unit of measure, a prime meridian, and a datum (based on a spheroid ).**Geographic****coordinate****systems**. A**geographic****coordinate****system**uses a three-dimensional spherical surface to determine locations on the earth. Any location on earth can be referenced by a point with longitude and latitude**coordinates**. For example, Figure 1 shows a**geographic****coordinate****system**where a location is represented by the**coordinates**longitude 80 degree East and latitude 55 degree North.A

**coordinate system**is a**system**of numbers used to uniquely determine the position of a point. For two-dimensional**systems**, the numbers ( scalars) are in ordered pairs. More dimensions call for more numbers. Related pages [ change | change source] Analytic geometry Cartesian**coordinate system**Celestial**coordinate system**Polar**coordinate system**