[GRASS-dev] Re: [GRASS GIS] #163: g.transform no longer calculating error for 2nd order transformation

[Michael Barton]

Yes. This has 6 points like it is supposed to. But the transformation
doesn't work. Doesn't work with more than 6 either.

Michael


On 6/17/08 3:44 AM, "GRASS GIS" <trac at osgeo.org> wrote:

> #163: g.transform no longer calculating error for 2nd order transformation
> -----------------------+----------------------------------------------------
>   Reporter:  cmbarton  |       Owner:  grass-dev at lists.osgeo.org
>       Type:  defect    |      Status:  new
>   Priority:  major     |   Milestone:  6.3.1
>  Component:  default   |     Version:  svn-develbranch6
> Resolution:            |    Keywords:  g.transform georectify
> -----------------------+----------------------------------------------------
> Comment (by martinl):
> 
>  Replying to [ticket:163 cmbarton]:
>> Sometime recently, g.transform stopped calculating forward and backward
>  error for 2nd order transformations. It simply returns 0's. 1st order
>  transformations still work fine AFAICT.
> 
>  The 2nd order transformations requires at least 6 GCPs. Your input POINTS
>  file contains 6 points. Then forward/reverse error is 0.0's.
> 
>  Martin

__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton