EN ISO 13565-1:1997

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Reference guide
5 Traversing direction
6 Filtering process to determine the roughness profile
7 Selection of the cut-off wavelength [lambda]c and the
  evaluation length ln
Annex A (informative) Relation to GPS matrix model
Annex B (informative) Bibliography
Annex ZA (normative) Normative references to international
                      publications with their relevant European
                      publications

Decribes a filtering method for use with surfaces having stratified functional properties. The surfaces have a relatively small amount of waviness. This filtering method suppresses the valley influence on the reference line such that a more satisfactory line is generated.