[OHM] OHM Hangout - 18 Dec, 8am PT US / 4pm London

Lester Caine lester at lsces.co.uk
Thu Dec 18 14:06:36 UTC 2014


On 18/12/14 12:58, SK53 wrote:
> Although OHM uses the OSM technology stack and most of us are OSMers, it
> is functionally & organisationally (not that it has much of a formal
> organisation) independent from OSM, and the OSMF.
> 
> So far in discussions over the past year I think our approach is
> slightly different from OSM

OSM is providing an ideal base to build on. With all of the historic
mapping that is now available as a background to the data set, and the
slowly growing inclusion of the correct tagging of historic elements
like start_date and end_date. Even the change-log history is now
accessible as another time axis for things like changes of names and the
like going forward, but that now needs augmenting with the previous changes.

The tools that need improving are those which allow secondary layers of
data to be merged with the main database. I see little point trying to
completely mirror a second copy of the master data which is so key as a
base. It is not so easy to add additional layers though such as
spreadsheets of population figures or many of the other geographically
related data sets. I view cross references to the likes of geonames and
wikipedia falling into this area, since it also allows the natural
addition of a time related filter. Tracking the evolution of a locations
TZ settings can be handled as a historic access to the geonames data, or
similar database.

While material that now has an end_date is purged from the main
database, it's content needs to be maintained in a secondary layer onto
which things like the now lost Roman roads, railway lines and other
structures can be mapped in exactly the same way as OSM currently works.
SO a mirror only needs to maintain material that has dropped out of
interest to current day mappers? But a substantial amount of that data
surfaces in the current day maps?

-- 
Lester Caine - G8HFL
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