Working with Raster Data

  • Markus Neteler
  • Helena Mitasova
Part of the The Kluwer International Series in Engineering and Computer Science book series (SECS, volume 689)


Raster data, stored in GRASS as a matrix of values, represent either a continuous field (surface), an image, or geometric objects (points, lines, areas) corresponding to discrete fields (Figure 5.1). For surfaces, the values in the matrix are assigned to the center points of grid cells. They represent the actual measured or computed values (e.g. elevation, slope, temperature). For noncontinuous fields (images, geometric objects), the values are assigned to the entire cell area and represent the category number.


Current Region Category Label Raster Data Continuous Field Category Number 


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Copyright information

© Springer Science+Business Media New York 2002

Authors and Affiliations

  • Markus Neteler
    • 1
  • Helena Mitasova
    • 2
  1. 1.Istituto Trentino di Cultura(ITC-irst)Italy
  2. 2.North Carolina State UniversityUSA

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