[OSM-talk] Preserving History ...

Blake Girardot bgirardot at gmail.com
Tue Aug 25 14:30:37 UTC 2015

Retaining the history is the most respectful thing you can do for 
mappers but I have seen a lot of new'ish mappers who feel that just 
deleting and starting over is easier.

In JOSM the "replace geometry" function can be used and it will retain 
the history and lets you "map from scratch" and retain history.

I have remapped very dense urban areas from scratch then used replace 
geometry to replace the buildings.

Once in a while a building was mapped as two when it was really one 
building so you have to delete.

But in general if you want to map from scratch, make a new layer, map, 
merge layers, replace geometry, done, history retained and you mapped 
from scratch.

Same thing with roads that need updating, you just remap it and then 
replace geometry or use the improve way tool, either one will preserve 

If anyone wants a detailed usage example just let me know, I made a 
youtube video demonstrating how remap a city block with replace 
geometry, but the steps I put in above are essentially it.


On 8/25/2015 4:10 PM, Martin Koppenhoefer wrote:
> sent from a phone
>> Am 24.08.2015 um 10:05 schrieb Lester Caine <lester at lsces.co.uk>:
>> Because 'it's easier to delete and start
>> again' is encouraged rather than 'preserve the history of development'
>> where someone HAS already spent the time doing that in the past so much
>> is being lost!
> can you expand on this? Where are people encouraged to delete rather than refine? I've always thought we would actually be encouraging people to retain history
> cheers
> Martin
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