[OSM-dev] Default scale / meters per unit ?

Tom Hughes tom at compton.nu
Wed Sep 30 13:32:35 BST 2009


On 30/09/09 13:30, Andy Robinson (blackadder-lists) wrote:
> Tom Hughes wrote:
>
>> The units are meters, but meters on the projected map not great circle
>> meters on the surface of the earth.
>>
>> What osm2pgsql does when you import in that mode is to project the data
>> onto a giant flat sheet - effectively it unrolls the globe and stretches
>> it until it is flat. The resulting coordinates are in meters but meters
>> on that imaginary projected surface.
>
> Does this mean that when you have in the past pulled way length totals from
> the pgsql db that the values will not be true to life?

I believe I have explained that when providing such numbers in the past...

Tom

-- 
Tom Hughes (tom at compton.nu)
http://www.compton.nu/




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