Elements of Raster Data: Point, Line and Polygon (Especially for GATE-Geospatial 2022)

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In its simplest form, a raster consists of a matrix of cells organized into rows and columns where each cell contains a value representing information, such as temperature. There are mainly three graphical elements

This Diagram Shows Three Graphical Elements

Point

A point is represented as a single cell – the smallest unit of a raster

This Diagram Shows Raster Point Feature

Line

Line is represented as a chain of spatially connected cells with the same value . when there is a break between the chains of same valued cells, it represents a break in the line feature, which could represent different features such as two roads or two rivers that do not intersect.

This Diagram Shows Raster Line Features

Polygon

A raster polygon is a group of contiguous cells with the same value that most accurately portray the shape of the area. Polygonal, or area, data is best represented by a series of connected cells. Examples of polygonal features include buildings, ponds, soils, forests, and fields.

This Diagram Shows Raster Polygon Features

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