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.

Table Shows Recorded Temperature at Different Time
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.

This Graph Shows the Time Temperature Axes Using Table

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