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Raster: meaning, definitions and examples

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raster

 

[ ˈrΓ¦stΙ™r ]

Noun / Verb
Context #1 | Noun

geospatial data

A raster is a grid-based data structure comprised of cells or pixels, with each cell containing a value representing information, such as temperature or elevation, for that location. Rasters are used in geographic information systems (GIS) to represent continuous data and are essential for tasks such as land use mapping and environmental monitoring.

Synonyms

grid, image, map.

Examples of usage

  • The satellite image is represented as a raster.
  • We analyzed the raster data to assess land cover changes.
  • The GIS tool requires a raster file for terrain analysis.
Context #2 | Verb

graphics manipulation

To rasterize is to convert a vector image or graphic into a raster image format composed of pixels. This process is essential for displaying graphics on screens or for printing, as raster images are made up of tiny dots that ensure they appear correctly on display devices.

Synonyms

bitmap, pixelate, render.

Examples of usage

  • We need to rasterize the logo for the web.
  • The designer rasterized the illustrations before printing.
  • Rasterizing the artwork improved the rendering speed.

Etymology

The term 'raster' originates from the Latin word 'rastrum', which means 'to scratch' or 'to scrape'. It is related to the concept of a 'raster scan', a method of displaying images in which the display hardware scans through the display one line at a time. This method became prevalent with the advent of television and computer screens. The usage of 'raster' in geospatial science emerged as digital mapping technology evolved in the late 20th century, allowing for the representation of complex geographical and environmental datasets in a structured and uniform manner. With the ongoing development of remote sensing technology and GIS software, the significance of rasters in spatial analysis and environmental modeling has only increased, making it a foundational concept in modern data visualization.

Word Frequency Rank

Positioned at #23,175, this word is part of extensive vocabulary. It's relatively rare in general usage but may be important in specific fields or formal writing.