[QGIS-trac] [Quantum GIS] #3361: Enhancement: raster edge detection and snapping for digitisation and georeferencing

[Quantum GIS]

#3361: Enhancement: raster edge detection and snapping for digitisation and
georeferencing
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   Reporter:  Alister                           |              Owner:  nobody       
       Type:  enhancement                       |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 2.0.0
  Component:  Digitising                        |            Version:  Trunk        
   Keywords:                                    |   Platform_version:               
   Platform:  All                               |           Must_fix:  No           
Status_info:  0                                 |  
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 (Someone asked about this on the user list a week or so ago.  I thought
 there was already a ticket, but if so, I can't find it)

 It would be useful to implement raster edge detection to allow for
 snapping to raster layers, both when digitizing and when georeferencing.

 The AutoGCP plugin must be using edge detection, so maybe some of the work
 is already done.  Or maybe some code could be borrowed code from another
 program such as [http://hugin.sourceforge.net/ Hugin]. (Hugin is a
 panorama maker that allows snapping when manually creating control points.
 But Hugin uses wxWidgets.)

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/3361>
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