[AM13-3] Interpolation

Interpolation is used to create a GIS layer out of point observations on a continuous variable. The reason for doing this could be manifold: for visualization purposes, for making a proper reference with other data, or for making a combination of different layers.

External resources

• ITC (2013) The Core of GIScience: A Process-based Approach. ITC educational textbook series. 524 pages. ISSN 1567-5777. ISBN 978-90-3653-719-3.

Learning outcomes

• 75 - Differentiate among common interpolation techniques (e.g., nearest neighbor, bilinear, bicubic)
  Differentiate among common interpolation techniques (e.g., nearest neighbor, bilinear, bicubic)
• 76 - Explain how the elevation values in a digital elevation model (DEM) are derived by interpolation from irregular arrays of spot elevations
  Explain how the elevation values in a digital elevation model (DEM) are derived by interpolation from irregular arrays of spot elevations
• 77 - Discuss the pitfalls of using secondary data that has been generated using interpolations (e.g., Level 1 USGS DEMs)
  Discuss the pitfalls of using secondary data that has been generated using interpolations (e.g., Level 1 USGS DEMs)
• 78 - Estimate a value between two known values using linear interpolation (e.g., spot elevations, population between census years)
  Estimate a value between two known values using linear interpolation (e.g., spot elevations, population between census years)

Self assessment

Outgoing relations

• [AM13-3] Interpolation is prerequisite of [IP1-3] Geometric correction
• [AM13-3] Interpolation subclassof [AM13] Representation transformation

Contributors

• Rob Lemmens
  University of Twente, Faculty of Geo-Information Science and Earth Observation (ITC)
  https://research.utwente.nl/en/persons/rob-lemmens