[OHM] OHM's purpose and differences with regular OSM

[Warin]

On 12/06/18 23:34, Carlos Cámara wrote:
> I have recently discovered OHM and, whereas I understand the 
> importance of displaying historical data and I acknowledge the 
> importance of a crowdsorced approach like OSM, it is not clear to me 
> how does OHM work and how it differs from regular OSM. As far as I 
> know, the username, tagging system and even software (at least JOSM), 
> work with OHM,

OSM does not recored what is no loner there. Sau an old railway that has 
been changed into house. It simple is no longer there so it does not go 
into OSM. In OHM is can exist.
> but apparently, the database and infrastructure are completely different.
The data base can use OSM as the present, but it would be a duplication. 
But can also have information about things that existed in the past.

The additional thing to having OHM are the start and finish dates so OHM 
then know at what time period these things existed.
>
> To make things more confusing, since I haven't seen any timeline or 
> slider, I am wondering if the displayed data has to be focused on a 
> specific period of time or not. That would explain the fact that I 
> zoomed in some areas like Rome or Egypt which potentially may have 
> historical data due to their long history, but could not see any data 
> on the map.