[Proj] Getting Extent Using Custom Projection

[Bradley Mclain]

Sorry for being stupid but what exactly goes into the geog_data.txt file? I
have tired putting the extent of the original but this does not work.

On 7/11/07, Gerald I. Evenden <geraldi.evenden at gmail.com> wrote:
>
> On Tuesday 10 July 2007 11:10 pm, Bradley Mclain wrote:
> > Ok what I have done is made a custom projection and I want to get the
> new
> > extent for my data.
> >
> > The original projection:
> > "# GDA94 / MGA zone 55
> > <28355> +proj=utm +zone=55 +south +ellps=GRS80 +towgs84=0,0,0,0,0,0,0
> > +units=m +no_defs  <>"
> >
> > The custom projection:
> > <41002> +proj=merc +lat_ts=0 +lon_0=0 +k=1.0 +x_0=0 +y_0=0 +a= 6378137.0
> > +b= 6378137.0 +units=m <>
> >
> > I understand that this must be done by console commands or something but
> I
> > have no idea how.
> >
> > Brad
>
> If you are using proj or lproj just execute the command:
>
> proj +proj=merc +a= 6378137.0 +b= 6378137.0
>
> or
>
> lproj +proj=merc +a= 6378137.0 +b= 6378137.0
>
> I edited out all the superfluous material.  Then follow the above commands
> with longitude latitude pairs and Cartesian will be output.
>
> More appropriately create a file of your geographic coordinates in file
> geog_data.txt and do:
>
> proj +proj=merc +a= 6378137.0 +b= 6378137.0 <geog_data.txt >results.txt
>
> --
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> -- Havelock Ellis (1859-1939)  British psychologist
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