geographical accuracy

[Graham Seaman]

Jonathan Peterson wrote:
>> digits for northing, 6 digits for easting. I'm using 
>> Geography::NationalGrid::GB to convert these to lat/long pairs. The 
>> results are all approximately correct, but generally about 20 metres or 
>>     
>
> Try Geo::Coordinates::OSGB ?
>   
Just did; tiny difference, much smaller than the error. I guess this 
means it's my raw data (the northings/eastings) that are a bit off :-(  
I wonder why that would be? I also have the postcodes, anyone have a 
ballpark figure for how much the PO charge for postcode->lat/long 
tables, and how accurate those would be?

Thanks for the suggestion, anyway!

Graham

> J
>
>
> _______________________________________________________________________
>
> This email and any attachments are confidential and intended solely for the addressee. They may not be disclosed to, used by or copied in any way by anyone other than the intended recipient. If you have received this email in error please notify postmaster at bmjgroup.com and delete the email transmission immediately.  
>
> Any views expressed in this email are those of the individual and may not represent those of the BMJ Publishing Group Ltd. 
>
> Computer viruses can be transmitted by email.  The recipient should check this email and any attachments for presence of viruses.The BMJ Publishing Group Ltd accepts no liability for damage caused by any virus transmitted by this email. Emails sent or received by the BMJ Publishing Group are monitored.
>
> BMJ Publishing Group Limited
> A private limited company, registered in England and Wales under registered number 03102371
> Registered office:  BMA House, Tavistock Square, London WC1H 9JR, UK. http://bmjgroup.bmj.com 
> _______________________________________________________________________
>