I've been looking at the OSM documentation. It would seem that we can
use start_data and end_date for both ways and relations. It might make
things easier to have ways (de)activate based on the date where things
changed and have the relation live on through different incarnations.
Keep in mind through that datums are messy (even in WGS84), you are
unlikely to notice the San Francisco slip unless your data source is
very good. Maps in the early 1900 had limited accuracy; the ones I
used were aiming for ~20 yards.
This brings the annoying question of whether we should be recording
accuracy of ways / node positions. I've been searching the OSM wiki
for standards and/or best practices about this without any success.
Any ideas out there?
best,
rhw
On 4-Mar-13, at 4:26 PM, johnny0 wrote:
It's not just shifting borders. What about changing physical
geography?
How best to handle changing coastlines over time? I'm thinking of
sunken Roman era ports.
http://ac-support.europe.umuc.edu/~jmatthew/naples/pozzport.htm
As well as man-made land:
http://blog.sfgate.com/ontheblock/2011/02/25/does-your-house-sit-on-landfill/
Also, shifting rivers:
http://blogfishx.blogspot.com/2011/05/will-mississippi-river-change-course.html
And what about earthquakes? There was 2 to 32 feet of horizontal
slip in the 1906 San Francisco earthquake.
http://earthquake.usgs.gov/regional/nca/virtualtour/earthquake.php
This last one is tricky.
-John
On 2013-03-04, at 12:07 PM, Rob Warren <[email protected]>
wrote:
I'd like to get it to that point, especially in recording the
changes in the spatial objects over time.
The other issue is that while a contributor might add the border of
the Kingdom of Prussia and another the border of the Free State of
Prussia, the ways that are common to both objects will eventually
need to be merged. This is going to require some creativity, but it
is doable. I also suspect that eventually we'll have a few
different 'application websites' that use the OHM back-end for
storage but render application specific timelines only.
I'd suggest we start by putting in some data and we'll build the
tools as we go along.
rhw
On 28-Feb-13, at 9:11 PM, [email protected] wrote:
Message: 2
Date: Thu, 28 Feb 2013 16:52:27 -0600
From: Ed Dykhuizen <[email protected]>
To: Burrito Justice <[email protected]>
Cc: "[email protected]" <[email protected]>,
Joseph
Pettigrew <[email protected]>
Subject: Re: [OHM] [Historic] Historic Digest, Vol 7, Issue 9
Message-ID:
<CAHDqN=8gEhHzJeazX6-s8RCu00uE0B-
[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Hi all,
I don't know if I should be counted towards any quorum of any kind
-- I'm
not a developer, just someone interested in this topic and very
happy to
see it being pursued. Specifically, I had an idea a while ago about
creating political maps for each year throughout history. So you
could look
at a political map of Europe around 343 BC and then move a dial
towards the
same area around 323 BC and see how the political map changed as
Alexander
the Great went on his conquerin' spree. I'm a big history fan, and
more of
a visual learner, so something like this would really help me
solidify a
lot of world history.
Granted, creating political maps for every year in history is a
Herculean
task. So I was hoping someone could develop an interface that
would allow
non-tech-savvy people like myself to make such changes. You know,
something
where I could go to the map of 343 BC and draw and then manipulate a
boundary like you do in Photoshop. Maybe I could then put in some
placemarks for specific events that then link to Wikipedia
articles about
them. Then when I'm done I could hit upload and see the changes on
a master
set of maps that anyone can work on. If it were that easy you
could maybe
get a lot of history buffs to do the work for free, a la Wikipedia.
Teachers in particular might be interested because the end product
could
really help in teaching history.
I've been reading the emails to try to figure out if something
like this is
in the works, but I admit, there's so much that's over my head
that I just
get lost. Does any of what I'm describing sound like anyone's plans?
Thanks so much for reading this,
Ed Dykhuizen
(And I'm including my friend Joe on this -- hope you don't mind!)
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