[GRASS-user] Reprojecting Vector Map

[Pablo Carreira]

Hi Rich,

I have a general theory that may help you:

Assumptions:
-Very well defined LOCATION parameters is the foundation to perfectly combine maps of different sources.
-The experience tells me that some data are even in the correct reference system, but sometimes the "info" that comes with it sometimes not.
-Each coutry has it's adequated reference system.
-GIS and GPS comes with a lot of reference systems, but they follow an international standard.
-Those standards sometimes differ a little from the "real parameters".

What I do:
-I always take control of my LOCATIONS by methodically defining all the parameters with proj.4 sentences before starting a job.
-Some location is a "receptacle" for data.
-One location is for the work.



Pablo Torres Carreira




> Date: Tue, 24 Nov 2009 11:53:22 -0800
> From: rshepard at appl-ecosys.com
> To: grass-users at lists.osgeo.org
> Subject: Re: [GRASS-user] Reprojecting Vector Map
> CC: 
> 
> On Tue, 24 Nov 2009, Rich Shepard wrote:
> 
> >  True. I completely forgot about this. With a new location/mapset I can
> > now use v.proj to move it over.
> 
>    I'm still missing something. Defined a new location (streetsLCC) and
> mapset (rbs). Ran the following command successfully:
> 
> GRASS 6.4.0svn (streetsLCC):/usr4/grassbase > v.proj input=streets
> location=streets mapset=rbs output=streets --verbose
> 
>    'g.region -p' still shows lat/long after specifying 'g.region
> vect=streets
> 
> GRASS 6.4.0svn (streetsLCC):/usr4/grassbase > g.region vect=streets 
> GRASS 6.4.0svn (streetsLCC):/usr4/grassbase > g.region -p
> projection: 99 (Lambert Conformal Conic)
> zone:       0
> datum:      nad83
> ellipsoid:  grs80
> north:      45.46163298
> south:      44.88493498
> west:       -122.868113
> east:       -121.651714
> nsres:      0.576698
> ewres:      1.216399
> rows:       1
> cols:       1
> cells:      1
> 
>    So I've not reprojected from LL to LCC at all.
> 
> Rich
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