[GRASSLIST:1439] Re: Converting surveyor's data

[Eric G . Miller]

On Sat, Feb 10, 2001 at 05:39:22PM -0800, Rich Shepard wrote:
> On Sat, 10 Feb 2001, Eric G . Miller wrote:
> 
> > However, if you can translate everything to points in space (rather than
> > bearing/azimuth) than I think maybe v.transform would be sufficient.
> 
> > If there's some kind of way to tag the reference points to real world
> > coordinates from whatever file formats are provided, then I'm sure a
> > script could be worked up to build a vector line layer.
> 
> Eric,
> 
>   These two sentences frame the problem exactly: translating a distance and
> direction from a known georeferenced point to another georeferenced point.
> Then taking the distance/bearing to the next point and georeferencing that.
> 
>   Sure, once all the nodes are georeferenced the rest is easy. But, it's the
> georeferencing step to which I referred. I infer from your answer that no
> one on the list has looked into this. Guess it's research time for ol' Rich
> in the Land of Geodesy.

Just need to know the starting point (or some point) I think (possibly a
benchmark in some real coordinate system).  Then everything else can be
calculated.

If it's lat/lon than there are library routines that could be used...

-- 
Eric G. Miller <egm2 at jps.net>