# [Proj] State Plane Coordinate Zone 6 Conversion Help

Matt Bartolome mattxbart at gmail.com
Fri Feb 23 17:09:39 EST 2007

```Frank,
That did the trick. Awesome. Now I can sleep tonight!

Thank you.
Matt

On 2/23/07, Frank Warmerdam <warmerdam at pobox.com> wrote:
> Matt Bartolome wrote:
> > Hello list,
> >
> > I'm trying to convert state plane coordinates from zone 6 (san diego
> > county, california)  to latitude longitude and I'm having trouble.
> >
> > \$ echo "6262009 1854017" | proj -I -f %.4f +proj=utm +zone=6
> >
> > -100.1078       11.6424
> >
> > I've also tried plugging in some computed constants I found but I'm
> > not sure if they are accurate.
> >
> > \$ echo "6262009 1854017" | proj -I -f %.4f +proj=utm +ellps=GRS80
> > +zone=6 +lat_0=32.166667 +lon_0=-116.25 +datum=NAD83 +k=0.999954142490
> >
> > -100.1078       11.6424
> >
> > I'm pretty sure the datum NAD83 is correct, as well as the GRS80
> > ellipsoid. The values should be close to -116, 32.
>
> Matt,
>
> +proj=utm +zone=6 is not at all the same thing as california state plane
> zone 6.
>
> Perhaps you want:
>
> echo "6262009 1854017" | proj -I -f %.4f +init=epsg:2230
> -117.2246       32.7499
>
> EPSG 2230 is "NAD83 / California zone 6 (ftUS)"
>
> epsg:2230 looks like:
>
> <2230> +proj=lcc +lat_1=33.88333333333333 +lat_2=32.78333333333333
> +lat_0=32.16666666666666 +lon_0=-116.25 +x_0=2000000.0001016
> +no_defs  <>
>
> Best regards,
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | President OSGeo, http://osgeo.org
>
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```