[postgis-users] GPS systems and projections

[Stephen Lee]

Hi there,

i think the SRID for WGS84 is 4326, i'm using it for all my maps that don't
have the prj files and so far its fine. as for floating the mouse over the
image in a web browser and have it report the GPS co-ordinates of the mouse
cursor, i'm using geoserver + openlayers to do that, geoserver comes with
svg support. hope this help.

stephen

On Wed, May 7, 2008 at 8:13 PM, James Dominy <james at sun.ac.za> wrote:

> Hi all,
>
> I have some GIS data in "GCS_WGS_1984". It's currently stored in shape
> files.
> I've successfully imported it into postgis using SRID = -1 (because I
> can't find
> GCS_WGS_1984 in SPATIAL_REF_SYS). I can generate an SVG file containing
> features
> matching a query and it looks okay. But, what I would like to be able to
> do is
> float the mouse over the image in a web browser and have it report the GPS
> co-ordinates of the mouse cursor. I figure this means I need to re-project
> the
> image in the relevant GPS co-ordinate system, which as far as I can tell
> means I
> actually have to store the features with a valid SRID (i.e. not -1)... So
> I
> guess this boils down to
>
> a) What is the SRID for GCS_WGS_1984, and if there isn't one, how do I go
> about
> creating one from the info in the .prj of a shape file?
>
> b) More generally, if I have a shape file with a .prj not listed in
> SPATIAL_REF_SYS, how do I go about importing it into postgis such that I
> can
> re project it later?
>
> b) In what SRID should I project the SVG, such that I can calculate GPS
> coordinates of the mouse cursor in a user selectable GPS system,
> preferably
> without reproducing the entire SVG in a different projection?
>
> Thanks,
> James
>
>
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