[OSRS-PROJ] Re: Datum shifting problem

Frank Warmerdam warmerdam at pobox.com
Tue Mar 16 23:50:12 EST 2004


Melita Kennedy (ESRI) has kindly pointed out that +es is eccentricity squared
while you appear to be using a flattening value for the parameter:

You wrote:
 >Flattening     +es=0.00336700336700273

 From Page 9 of of90-284.pdf the earth figure parameters are:

   a - semimajor axis
   b - semiminor axis
   f - flattening
  rf - reciprocal flattening (1/f)
   e - eccentricity
  es - eccentricity squared

Perhaps you should have specified +f=0.00336700336700273?

I don't know if this is your problem, but certainly it would potentially
have a radical effect on your earth figure if you use the wrong parameter.

Best regards,

I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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