geographical accuracy

Graham Seaman graham at theseamans.net
Wed Feb 21 12:38:54 GMT 2007


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

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