[Gvsig_english] scalebar in EPSG 4326 (wgs 84 World 2D)

[Benjamin Ducke]

Right, I just checked my good old school atlas, and they
do exactly that: there is a little comment to the right 
of the scale bar that reads "scale at the equator".

Cheers,

Ben

----- Original Message -----
> Re: [Gvsig_english] scalebar in EPSG 4326 (wgs 84 World 2D)
> 
> Hello,
> 
> Benjamin's comment makes a lot of sense as usual.
> 
> Nevertheless, a gvSIG view in EPSG:4326 still shows a value for the
> scale denominator, which I presume refers to the scale along the
> Equator.
> 
> I think a map without a scale in somewhat incomplete.
> 
> If your map is in EPSG:4326, I recommend to add a scale bar with a
> little comment by its side that says something like: "Approximate
> scale, valid along the Equator and along meridians" (because the
> length of the Equator is about the same as the length of every
> meridian, with an error of perhaps 0.5% or less, which is not very
> important)
> 
> Regards,
> Juan Lucas Domínguez Rubio
> ---
> 
> Prodevelop SL, Valencia (España)
> 
> Tlf.: 96.351.06.12 -- Fax: 96.351.09.68
> http://www.prodevelop.es
> ---
> 
> 
> De: gvsig_internacional-bounces at listserv.gva.es en nombre de Benjamin
> Ducke Enviado el: lun 23/05/2011 17:45
> Para: Users and Developers mailing list
> Asunto: Re: [Gvsig_english] scalebar in EPSG 4326 (wgs 84 World 2D)
> 
> 
> 
> 
> Hi Carsten --
> 
> EPSG 4326 is an unprojected geodetic system.
> Since no projection to cartesian coordinate space is done,
> the scale of the displayed data varies, depending on where you
> measure it -- that's why there are no globes with scale bars
> printed on them ;). All you could do is draw an estimated
> scale bar yourself in an external program and then import
> that into your gvSIG map layout.
> 
> Alternatively, you can project your data into a cartesian
> system, such as UTM and work with that.
> 
> Ben
> 
> ----- Original Message -----
> > Hello,
> >
> > I'd like to add a scalebar in a map created from a view using the
> > EPSG 4326 (WGS84 word 2D) Projection.
> > Unfortunately, the scalebar function does not work as correct as in
> > some other projections. I searched for a solution in the faq, but
> > did not find a result.
> > Also the scale seems to be announced wrong. (Europe in DIN-A4 is
> > like
> > 1:1). Is there a possibility to solve this problem?
> > Regards Carsten Mischka
> >
> > _______________________________________________ Gvsig_internacional
> > mailing list
> > Gvsig_internacional at listserv.gva.es
> > http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
> 
> 
> ------ Files attached to this email may be in ISO 26300 format (OASIS
> Open Document Format). If you have difficulty opening them, please
> visit http://iso26300.info for more information.
> 
> _______________________________________________ Gvsig_internacional
> mailing list
> Gvsig_internacional at listserv.gva.es
> http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
> 
> _______________________________________________ Gvsig_internacional
> mailing list
> Gvsig_internacional at listserv.gva.es
> http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional


------
Files attached to this email may be in ISO 26300 format (OASIS Open Document Format). If you have difficulty opening them, please visit http://iso26300.info for more information.