# Rectangular Coordinates and Plane Coordinates (Especially for GATE-Geospatial 2022)

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The rectangular coordinate system is also known as the Cartesian coordinate system. The rectangular coordinate system is based on a grid, and every point on the plane can be identified by unique x and y coordinates.

- A plane with x and y-axes defined is often referred to as the Cartesian plane or x-y plane. The value of x (horizontal line) is called the x-coordinate or
**abscissa**and the value of y (vertical line) is called the y-coordinate or**ordinate**. The value of x coordinates is positive if we move to the right of 0 and negative if we move left. Same as for y-coordinates in vertical manner. - Digitizes are the devices used to input geographic coordinates into a GIS system. In the normal situation, the X value is called an
**easting**because it measures distance east of the origin or starting point and the Y value is called**northing**because it measures distance north of the origin. - Fixed point to the south and west of a grid zone from which grid distances are measured eastward and northward are called
**false origins**. Measures from false origins are called**false easting**on the abscissa and**false northing**on the ordinate line.

Measurements often are recorded as two related numbers.

## Example: Plot the Table Using the Time and Temperature Axes

We plotted the following recorded temperatures at some location on a line.

Time (pm) | Temperature |

1 | |

2 | |

3 | |

4 | |

5 | |

6 |

Suppose these numbers were recorded at different times shown on the table above, then we can plot the data using the rectangular coordinate systems.