[postgis-users] How do you obtaining a WGS-84 (4326) coordinate from a coordinate that has no SRID

[David Fawcett]

To me, the math in a geographic project is too complicated.

I would think about projecting your corner point to a local UTM
projection and then using the local coordinate values to calculate UTM
values for each point.

You could then transform your data back to geographic.

David.

On Wed, Aug 19, 2009 at 2:11 PM, ILAN BENISTY<benisty.ilan at gmail.com> wrote:
> Hi,
>
> I am dealing with a problem where I am importing an AutoCAD description of
> an airport (DXF) into PostGIS.
> I have a Python script which will import each coordinate to a PostGIS
> geometry with SRID = -1 (since I do not have real world coordinates, but
> Cartesian coordinates from a point of origin).
> I do, however, have a lat/long reference point, which represents the origin
> of my x/y CAD coordinates.
> I would like to be able to store my CAD coordinates points as Long/Lat
> (SRID=4326).
> Any suggestions?
>
> Thanks,
>
> Ilan
>
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