[OSM-talk] Working with lat and long simply

[Oleksiy Muzalyev]

On 10/09/16 20:23, Colin Smale wrote:
>
> On 2016-09-10 18:55, Oleksiy Muzalyev wrote:
>
>> Latitude and longitude are physical values, they will never change 
>> for a house on Earth, no matter what. They do not depend on politics, 
>> economics, linguistics of the current moment.
>>
> You sure about that? Plate tectonics means that everything is in 
> motion, albeit slowly. On top of that there have been a couple of 
> "adjustments" to WGS84 which have caused coordinates to change.
>
> //colin
>
>
>
> _______________________________________________
> talk mailing list
> talk at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk

Indeed, 2 - 5 cm per year. It is a lot. I did not think they move so 
fast. Two-five meters per century. Then if we use this method, a marker 
should be pointed initially to the middle of a house, so that in a 
hundred years it is still pointing to its edge.


However, street names change too, - for example: 
http://novgorod.me/media/live/2015/04/AS9dCvAZDuY-1-600x310.jpg , 
sometimes several times per century as on this photo. Not even street 
name, but even language and alphabet changed three times.


I could not find out though how significantly coordinates changed with 
"adjustments" to WGS84, and if such adjustments will continue.

Best regards,

Oleksiy


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk/attachments/20160910/32de0c39/attachment.html>