[Proj] Getting Extent Using Custom Projection
bradleym06 at gmail.com
Wed Jul 11 01:25:58 EDT 2007
Don't worry managed to solve it and it works prefect now.
Thanks for your help :)
On 7/11/07, Bradley Mclain <bradleym06 at gmail.com> wrote:
> 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
> > --
> > The whole religious complexion of the modern world is due
> > to the absence from Jerusalem of a lunatic asylum.
> > -- Havelock Ellis (1859-1939) British psychologist
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