Question

Discuss the vector data formats. Give an example.

Answer 1

The vector data format represents real-world geographic features using precise coordinate pairs (X, Y). Instead of storing data as a grid of pixels, it defines discrete objects with explicit boundaries through three basic geometric entities:

1. Point: Represents an isolated object that is too small to have a measurable area at the map scale. It is stored using a single (X, Y) coordinate pair.
   Examples: An isolated tube well, a temple, or a specific settlement/city spot.
2. Line: Represents linear features that have a definite length but no width at the map scale. It is stored as an ordered sequence of connected coordinate points.
   Examples: A continuous railway track, a road network, or a river path.
   
3. Polygon: Represents bounded geographic zones that enclose a measurable surface area. It is stored as a closed loop of lines where the starting and ending coordinates are identical.
   Examples: An entire agricultural field, a lake, or a bounded forest patch.