[postgis-users] Coordinate transformation

[Yuriy Rusinov]

Hello, All !

I have to make coordinate transformation from one projection
 PROJCS["Custom",GEOGCS["GCS_Clarke_1866",
DATUM["Not_specified_based_on_Clarke_1866_ellipsoid",SPHEROID["Clarke_1866",
6378206.4,294.9786982]],
PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295
]],PROJECTION["Stereographic"],
PARAMETER["False_Easting",0],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",0],
PARAMETER["Scale_Factor",1],PARAMETER["Central_Parallel",90],UNIT["Meter",1]]

id (300006) to another, GEOGCS["Unknown datum based upon the Krassowsky 1940
ellipsoid",DATUM["Not_specified_based_on_Krassowsky_1940_ellipsoid",SPHEROID["Krassowsky
1940",6378245,298.3
,AUTHORITY["EPSG","7024"]],AUTHORITY["EPSG","6024"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
UNIT["degree",0.01745329251994328
,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4024"]]
(id 4024)  make sql-statement
 SQL: select astext ( transform ( GeomFromText ('POINT (-2898380.75 -
2900345.00)', 300006),4024));
and sometimes I receive error transform: couldn't project point: -20
(tolerance condition error). Because I work with polar
regions I think that this error is connected with possible singularities in
projections. Which way I have to trace this cases ?
Previous message was with an error, sorry.

-- 
Best regards,
Sincerely yours,
Yuriy Rusinov
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20060515/865e62cb/attachment.html>