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@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
_______________________________________________
talk mailing list
talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/talk
