Raster Data, Its Georeferencing and Its Elements (Especially for GATE-Geospatial 2022)

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Raster Data Model

A raster consists of a matrix of cells organized into rows and columns where each cell contains a value representing information, such as temperature.

Rasters are digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps.

Raster datasets represent geographic features by dividing the world into discrete square or rectangular cells laid out in a grid. Each cell has a value that is used to represent some characteristics of that location.

This Diagram Shows Raster - One of Three Primary Datasets in …

The larger the area represented, the lower the resolution of data. Cells are identified by their positions in the grid.

Georeferencing of Raster Data

Raster data is geo-referenced by:

  • Real world coordinates of the reference point
  • Cell size in real world distance
  • Use the upper-left or lower-left corner of grid as the reference point.

Elements of the Raster Data Model

  • Raster model divides the area into grid cells or pixel.
  • Each grid cell is filled with the measured attribute values.
  • It can represent points, lines, and area.
  • Resolution depends on real world area represented by each grid cell.

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