[mapserver-users] Shape file conversion question

[Paul Ramsey]

No, sadly there is not a nice easy-to-read list of options. They seem to
be sprinkled throughout the manual. EPSG codes are the easiest: if your
projection is in the epsg list (12345, say), handing proj4 an
"init=12345" will give you that EPSG projection.

Tyler Mitchell wrote:
> 
> Is there an easy-to-understand list of the options for proj4?  I couldn't
> seem to find anything that was really helpful.  And what about th EPSG
> codes?
> 
> Anyone have any good pointers.
> 
> Steve,
> 
> MapServer can already handle this situation without the need to convert
> your files if you have PROJ4 built into your mapserver which would be a
> good thing. In the mapfile there is a PROJECTION ... END section that
> can be added before the LAYER definition in which case it is interperted
> as the output project to use when you display your map. This is NOT the
> section you need for your problem.
> 
> When you define a LAYER if you include a PROJECTION ... END section
> which defines the current projection of the data defined in the data
> files for this specific layer. So you would have to know (in any case)
> what the projection parameters are for the data in your shape file, then
> define layers like:
> 
> LAYER
>   NAME streets
>   ...
>   PROJECTION
>     "proj=latlong"
>     # you might optionally need to define the ellps and other params
>     "ellps=grs80"
>   END
>   ...
> END
> 
> LAYER
>   NAME parcel
>   ...
>   PROJECTION
>     "proj=utm"
>     ...
>   END
>   ...
> END
> 
> I hope this helps,
>   -Steve W.
> 
> > klehr1 at tampabay.rr.com wrote:
> >
> > GIS 101 Question:
> >
> > I have a street layer shape file in decimal degrees and would like to
> > overlay that on the parcel shapefile which is in feet.
> >
> > Parcel Layer:
> > [steve at Miracle mapserv]$ ./showextent.pl /usr/maps/jbs.shp
> > 2102351.89913092 394981.042580036 2250421.58049244 608454.114243081
> > 2094948.41506284 384307.388996884 2257825.06456052
> > 619127.767826233
> >
> > Street Layer
> > [steve at Miracle mapserv]$ ./showextent.pl /usr/maps/str12065.shp
> > -84.076234 30.118074 -83.604398 30.671142
> > -84.0998258 30.0904206 -83.5808062 30.6987954
> >
> > Question:
> >
> > What are options in making these two files work together in the same
> > view? (i.e. convert the shape file, or add a world file, projection
> > file?)
> >
> > If you could elaborate a little on the solutions that would be great
> > (i.e. conversion suggestion, or world file conversion example).
> >
> > Thank you very much.
> > Steve Lehr
> >
> >