Which one of the following is not an advantage for raster data format?

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UGC NET Paper-2: Geography 2nd Dec 2019
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  1. Simple data structure
  2. Easy and efficient overlaying
  3. Compatible with remotely sensed imagery
  4. Application for network analysis

Answer (Detailed Solution Below)

Option 4 : Application for network analysis
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GIS data format:

  • GIS data formats can be categorized into two, spatial and attribute data format.
  • Spatial data is a geographical representation of features.
  • In other words, spatial data is what we actually see in the form of maps (containing real-world features) on a computer screen.
  • Spatial data can further be divided into two types- vector and raster data.

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Raster data format:

  • Raster data is made up of pixels.
  • It is an array of grid cells with columns and rows.
  • Each and every geographical feature is represented only through pixels in raster data.
  • There is nothing like point, line, or polygon. Easy and efficient overlaying process.
  • Raster data format is compatible with remotely sensed imagery.
  • If it is a point, in raster data it will be a single pixel, a line will be represented as a linear arrangement of pixels and an area or polygon will be represented by contiguous neighboring pixels with similar values.
  • In raster data, one pixel contains only one value (unlike vector data where a point, a line, or a polygon may have a number of values or attributes) that’s why only one geographical feature can be represented by a single set of pixels or grid cells.
  • Hence a number of raster layers are required if multiple features are to be considered (For example- land use, soil type, forest density, topography, etc.).
  • F1 Lalita V Anil 08.02.21 D5

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Network analysis with point and line is more compatible with the vector data format.

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