[josm-dev] JOSM Modeless???

[Gabriel Ebner]

On Wed, Oct 24, 2007 at 05:09:31PM +0200, John Bäckstrand wrote:
> Rick Collins wrote:
> > One feature I would love to see could facilitate the use of track 
> > data for generating ways.  Rather than use JOSM as electronic tracing 
> > paper to draw ways over top of the tracks, I would like to have a 
> > means to select nodes from the track to be transferred to a new 
> > way.  In essence, let the track define the points and I am just 
> > culling the ones that are superfluous to the way.  I think this could 
> > be facilitated by letting JOSM tell you which points can be 
> > eliminated and keeping the way to within a user specified distance of 
> > the track.  In fact, I am working on a tool to test how well this can 
> > work.  When I am done, I will be happy to share the algorithm, or 
> > perhaps I will learn to code in Java and I can share the code.
> >   
> Firstly I am pretty sure someone implemented douglas-peucker line 
> approximation for JOSM, but I could be wrong. Secondly your approach 
> will consistently makes curves smaller than they really are, I find I 
> "overshoot" the points I make ways out of to get the actual line/way to 
> line up somewhat with the underlying track.

The simplify way tool from the utilsplugin can do DP on an existing way.  If
you want to do it on GPS data, you have to convert it to a data layer first.

  Gabriel.