Dynamic SRID

Question

I am working with Oracle 8.1.7 and need to compute Lat/Long values from offsets (in feet) from a point (Lat/Long). Since spatial cannot handle distances using the geographic coord sys, it is suggested to convert to a "local" projection to calc location then convert back. Unfortunately my offset values are based on points in a 2.5 minute grid, which results in almost 8000 unique projections (too many to add to cs table in oracle).
Here's my question:
Is there a way to calc the location based on offsets and the Lat/Long point they offset into a Lat/Long value?
I can do it by creating a specific SRID for each grid point, but I need to convert in bulk. I was wondering if there is a SQL statement, function that can modify the SRID (wktext specifically) and transform using the modified SRID. Or is there a way to do a transform with a SRID not in the cs table but defined some other way.
Thanks in advance

Answer 1

Daniel-
You can convert lat/long into Albers meters space using SDO_CS.TRANSFORM and SRID=32775.
Perhaps you could transform a lat/long to Albers meters, then calculate a new location and finally transform the new location back to lat/long.
Other local coordinate systems might transform more accurately than 32775, but how accurate do you need to be 1m, 10m (rhetorical)? You might want to compare calculations using 32775 and one of the local coordinate systems to see if the difference is acceptable.
-Chris