Scale factor change in 11g?

This is what i do on Oracle 10g R2 and 11g.
select wktext from cs_srs where srid = 28992;
On 10g R2 I get:
PROJCS["Amersfoort / RD New",
          GEOGCS [ "Amersfoort",
               DATUM ["Amersfoort (EPSG ID 6289)",
                    SPHEROID ["Bessel 1841 (EPSG ID 7004)",
                    6377397.155, 299.1528128], 593.16, 26.15, 478.54, -1.30439800822601264037402186442411206952, -.103297414968545854662361857351254024323, -1.14450153042326354585672371782129234178, .9999959225],
               PRIMEM [ "Greenwich", 0.000000 ],
               UNIT ["Decimal Degree", 0.01745329251994328]],
          PROJECTION ["RD New (EPSG OP 19914)"],
     UNIT ["Meter", 1]]
On 11g I get:
PROJCS["Amersfoort / RD New",
          GEOGCS [ "Amersfoort",
               DATUM ["Amersfoort (EPSG ID 6289)",
                    SPHEROID ["Bessel 1841 (EPSG ID 7004)", 6377397.155, 299.1528128],
                    593.16, 26.15, 478.54, -1.304398008226, -.103297414969, -1.144501530423, 4.0775],
               PRIMEM [ "Greenwich", 0.000000 ],
               UNIT ["Decimal Degree", 0.01745329251994328]],
          PROJECTION ["RD New (EPSG OP 19914)"],
          UNIT ["Meter", 1]]
Now the interesting part is in the scale factor of the datum transform:
On 10g R2 this is:
.9999959225],
on 11g this is
4.0775
I understand that 11g is doing it correct as the scale factor needs to be defined in Parts Per million, so it should be read as:
1.0 + 4.0775 * 1.0e-6.
But then I don't get 0.9999959255.
I only get that value when I do:
1.0 - 4.0775 * 1.0e-6.
So has the scale factor been wrong in Oracle 10g R2 all the time?
Is Oracle Spatial wrong again as it should be 1.0 + ppm * 1.0e-6?
Am very confused here...
Edited by: [email protected] on Jan 25, 2010 4:04 PM

Yes, a small subset of the EPSG SRIDs had this problem in 10gR2. OGC SRIDs were not affected. The value in 11g is correct, based on the EPSG data.

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