To the list of courses || RASA2018 || To the theme || Estonian

Exercise 3935. Points 3, theme: Lines

Open exercise

The line in the attached file represents antique road from France to Col de Tende (Colle di Tenda) pass in Alps. The elevation difference per 1820 m planar distance is 720 m, which means 22.7 degrees angle on a straight line. See photos of this pass.

This line should be generalized for cartographic presentation.

  1. How many vertices will remain and how long is the generalized line if to use Ramer–Douglas–Peucker algorithm and if to use radial distance algorithm? Let the generalization tolerance be 100 m for both methods.
  2. Which method would you prefer for generalized cartographic representation? Why?
Data: Col_de_Tende.txt


  • Open the online Line generalization in the SDC.
  • Find attribute Same line tolerance. Write a large number there (eg. 10000). The line is splitted into parts if the distance between successive vertices is more than tolerance.

See the theme page where the line generalization methods are explained.

Log in to send your results and to see the expected answer and responses from other students.