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@COMMENT written by Patrick Riley <http://sourceforge.net/users/patstg/>
@TechReport{TR03-rrtf, 
  author =      {Greg S. Schmidt and J. Edward {Swan~II} and Derek Overby and 
                 Lawrence Rosenblum and Erik B. Tomlin}, 
  title =       {A System with Intelligent Editing for Extracting Ridge and 
                 Ravine Terrain Features}, 
  institution = {Naval Research Laboratory}, 
  type =        {Memorandum Report}, 
  year =        2003, 
  abstract =    { 
We describe a system for extracting ridges and ravines from elevation data.  The 
application context is a map-based military planning tool which allows users to 
select ridges and ravines by simple mouse clicks.  The extracted terrain 
features are complete in the application-specific sense that they conform to 
what our users expect a single ridge or ravine to look like.  Supervision is 
supported by a graphical user interface, which allows an analyst to modify 
algorithm parameters as well as perform intelligent mouse-based editing 
operations.  Among similar existing systems, ours is unique in that it focuses 
on the three classically difficult operations of (1) combining partial features, 
(2) splitting multiply-connected features, and (3) removing micro-terrain 
features for extracting high-level structure from classified pixels. 
}, 
}