Hi all,
I am working with spatial data that has been collected for the past
several decades at a site using a custom local coordinate system. I have
a few points at this site where I know both the local grid and the world
coordinates. Ideally, I'd like to define a custom srid to transform
between projections.
I would like to know more about adding new coordinate reference systems
to the spatial_ref_sys table, however I need to know a few things:
1. Do I need to define all of: srid, auth_name, auth_srid, srtext,
and proj4text fields in the spatial_ref_sys table? Or only a few
fields (specify which are required or optional)?
2. How would I define the projection for a local survey grid? (I may
alternately ask this on the proj mail list)
At present, I have a spreadsheet to scale, translate and rotate points
to NAD83/UTM9N, or I use similar commands in CAD for drawings, but I
have much more work, and I'd like to make the translation more streamlined.
Any suggestions, answers, hints, or examples would be greatly appreciated.
Best regards,
-Mike
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