[GRASS-user] (kein Betreff)

[Michael Misun]

hi, first of all thanks a lot for your answers.
that is true wat you say eric, but i hope there would be a solution for my problem. i know, that in grass4 was a module called v.plant which fills in points on a line in a specified space but i doesn't work here in my grass6.2.3

above all i work in a location for mars not for the earth 

-------- Original-Nachricht --------
> Datum: Thu, 13 Dec 2007 14:12:13 -0500
> Von: "Patton, Eric" <epatton at nrcan.gc.ca>
> An: "Gerald Nelson" <gnelson at uiuc.edu>, "Nikos Alexandris" <nikos.alexandris at felis.uni-freiburg.de>, "Michael Misun" <doppelM at gmx.de>
> CC: grass-user at lists.osgeo.org
> Betreff: RE: [GRASS-user] (kein Betreff)

> The width of a degree of longitude varies by latitude; meridians of
> longitude converge to
> a single point at the poles. Latitude varies as well, although
> considerably less so, due to 
> the rotation of the earth slightly squashing the poles, and bulging the
> Equator.
> 
> ~ Eric.
> 
> 
> -----Original Message-----
> From: grass-user-bounces at lists.osgeo.org on behalf of Gerald Nelson
> Sent: Thu 12/13/2007 3:06 PM
> To: 'Nikos Alexandris'; 'Michael Misun'
> Cc: grass-user at lists.osgeo.org
> Subject: RE: [GRASS-user] (kein Betreff)
>  
> I'm curious about the statement that "Lat-Long is not good to do distance
> measurements" Someone else made a similar observation in a different
> conversation recently too. I'm not a geographer so I'm probably missing
> something but doesn't lat long just give you a point on the surface of the
> earth and if you have two of these don't you more or less automatically
> know
> the distance between them?
> 
> Regards, Jerry
> 
> -----Original Message-----
> From: grass-user-bounces at lists.osgeo.org
> [mailto:grass-user-bounces at lists.osgeo.org] On Behalf Of Nikos Alexandris
> Sent: Thursday, December 13, 2007 10:55 AM
> To: Michael Misun
> Cc: grass-user at lists.osgeo.org
> Subject: Re: [GRASS-user] (kein Betreff)
> 
> Lat-Long is not good to do distance measurements!
> 
> Why don't you reproject your lines in a "metric" projection system and
> check the distances again.
> 
> On Thu, 2007-12-13 at 14:03 +0100, Michael Misun wrote:
> > hello everybody!
> > i have a little problem:
> > i want to set vertices on lines in a specified space (e.g. 2 km) in a
> lat
> long coordinate system.
> > i tried it with "v.to.points -vi .... dmax=0.03" and it works. the
> problem
> is, that in the equatorial zone the space between the new added points is
> about 1,7 km but up to the polzones the spacing is rather smaller and
> about
> 600 m!
> > can anybody help me with this problem? a want to have an equal space for
> all vertices on my polylines
> > 
> > michael
> -- 
> Nikos Alexandris
> .
> Department of Remote Sensing & Landscape Information Systems
> Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University
> Freiburg
> .
> Tel.  +49 (0) 761 203 3697 / Fax.  +49 (0) 761 203 3701 / Skype:
> Nikos.Alexandris
> .
> Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
> 
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