Answer the following questions in about 30 words :
(i) Differentiate between raster and vector data models.
Answers
Explanation: Raster graphics: are digital images created or captured (for example, by scanning in a photo) as a set of samples of a given space. A raster is a grid of x and y coordinates on a display space. (And for three-dimensional images, a z coordinate.) ... A raster file is usually larger than a vector graphics image file.
Vector Data Model: [data models] A representation of the world using points, lines, and polygons. Vector models are useful for storing data that has discrete boundaries, such as country borders, land parcels, and streets.
Difference between
The vector model uses points and line segments to identify locations on the earth while the raster model uses a series of cells to represent locations on the earth. The figure represents vector (left) versus raster (right) data. One of the most common types of raster data is land cover derived from satellite imagery.