[postgis-tickets] [PostGIS] #2464: st_curvetoline maxError instead of segments/quarter paramter

[PostGIS]

#2464: st_curvetoline maxError instead of segments/quarter  paramter
-------------------------+--------------------------------------------------
 Reporter:  mjurce       |       Owner:  pramsey      
     Type:  enhancement  |      Status:  new          
 Priority:  low          |   Milestone:  PostGIS 2.2.0
Component:  postgis      |     Version:  trunk        
 Keywords:  curves       |  
-------------------------+--------------------------------------------------

Comment(by mjurce):

 The maxError " maxDist(chord,arc) with n points segmentation could be
 computed:
 maxError=r*(1-cos( theta/(2*(n+1)) ) )

 Solving for "maxError" should give:

 nPoints = theta/(2*acos(1- maxError/r))

 Someone could check if this is correct?
 Then is easy to plug-in into arc segmentizer.
 The angle increment will be given from this formula.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2464#comment:3>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.