Hello, All !<br>

<br>

I have to make coordinate transformation from one projection<br>
&nbsp;PROJCS[&quot;Custom&quot;,GEOGCS[&quot;GCS_Clarke_1866&quot;,<br>
DATUM[&quot;Not_specified_based_on_Clarke_1866_ellipsoid&quot;,SPHEROID[&quot;Clarke_1866&quot;,6378206.4,294.9786982]],<br>
PRIMEM[&quot;Greenwich&quot;,0],UNIT[&quot;Degree&quot;,0.017453292519943295]],PROJECTION[&quot;Stereographic&quot;],<br>
PARAMETER[&quot;False_Easting&quot;,0],PARAMETER[&quot;False_Northing&quot;,0],PARAMETER[&quot;Central_Meridian&quot;,0],<br>
PARAMETER[&quot;Scale_Factor&quot;,1],PARAMETER[&quot;Central_Parallel&quot;,90],UNIT[&quot;Meter&quot;,1]] <br>
id (300006) to another, GEOGCS[&quot;Unknown datum based upon the Krassowsky
1940
ellipsoid&quot;,DATUM[&quot;Not_specified_based_on_Krassowsky_1940_ellipsoid&quot;,SPHEROID[&quot;Krassowsky
1940&quot;,6378245,298.3,AUTHORITY[&quot;EPSG&quot;,&quot;7024&quot;]],AUTHORITY[&quot;EPSG&quot;,&quot;6024&quot;]],PRIMEM[&quot;Greenwich&quot;,0,AUTHORITY[&quot;EPSG&quot;,&quot;8901&quot;]],<br>
UNIT[&quot;degree&quot;,0.01745329251994328,AUTHORITY[&quot;EPSG&quot;,&quot;9122&quot;]],AUTHORITY[&quot;EPSG&quot;,&quot;4024&quot;]]<br>
(id 4024)&nbsp; make sql-statement <br>

&nbsp;SQL: select astext ( transform ( GeomFromText ('POINT (-2898380.75 -2900345.00)', 300006),4024));<br>

and sometimes I receive error transform: couldn't project point: -20 (tolerance condition error). Because I work with polar<br>

regions I think that this error is connected with possible singularities in projections. Which way I have to trace this cases ?<br>
Previous message was with an error, sorry.<br clear="all"><br>-- <br>Best regards,<br>Sincerely yours,<br>Yuriy Rusinov