[postgis-users] NAD conversion problem

[Frank Warmerdam]

Peter N. Schweitzer wrote:
> Dylan Beaudette wrote:
>> Looks close to the output from proj4 above.
>>
>> Thoughts?
> 
> Dylan,
> 
> Thanks for showing me how to check the calculations.  I get identical
> results using my copies of cs2cs and postgis, on both systems.
> I conclude from this that the effect of adding @null to the definition
> of NAD27 in pj_datums.c is that it somehow eliminates the error message
> but doesn't render the results incorrect.  I don't pretend to understand
> why this is so, but I'm happy to proceed with this configuration.

Peter,

Adding @null to the end essentially means that if all else fails, just
apply a null transformation and don't complain if the null file isn't
found.

Best regards,
-- 
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