[Historic] the "spherical mercator" of time?

[Aaron Straup Cope]

Yeah, Carden and Migurski. I will badger them to join the list :D

On 8/23/12 1:59 PM, Jeff Meyer wrote:
> Aaron - do you mean Carden and Migurski or another Tom &/or MIke?
>
> Dan - your demo is cool, but is that as fast as it can go? ; )
>
> Mikel - are you thinking of the tiles being dependent on just physical
> characteristics of the earth's surface or also of animal-imposed
> activity (e.g. national borders like Dan depicts, or paths of explorers,
> battles, changes in roads, street names, animal habitats, etc.).
>
> For some time ranges (e.g. pre-industrial era), it would seem that
> decade or century-wise (or never at all) updates to shorelines, etc.
> would be fine. After that, it would seem that man's influence on the
> shape of shorelines and other terraforming (e.g. the Netherlands,
> Venice, Seattle after 1860, SF, Boston, Dubai, Krakatoa, canals, you
> name it...) would make a higher resolution approach more interesting.
> That said, the relative % of tiles requiring updates over these periods
> would seem pretty small.
>
> - Jeff
>
>
> On Thu, Aug 23, 2012 at 8:35 AM, Dan Vanderkam <danvdk at gmail.com
> <mailto:danvdk at gmail.com>> wrote:
>
>     Depending on the situation, we may be saved by the fact that most
>     features on a historical map won't change that frequently. For
>     instance, in my countries of the world demo (* see below), I used
>     two layers: a tiled geographical layer (which never changes) and a
>     country boundaries layer (which rarely changes on short timescales).
>     Compositing features client-side becomes a more compelling approach
>     with historical maps, since the features can change or remain the
>     same independently of one another.
>
>        - Dan
>
>     * http://danvk.org/whm/map.html. Disclaimers: this works best in
>     Chrome. You can pan with the mouse and use the scroll wheel to zoom.
>     It uses unlicensed commercial data, so please don't share the link.
>
>     On Aug 23, 2012 5:54 PM, "Aaron Straup Cope"
>     <aaronofmontreal at gmail.com <mailto:aaronofmontreal at gmail.com>> wrote:
>
>         It's definitely a thing that's been talked about in the past at
>         Stamen.
>
>         If Mike and/or Tom aren't on the list already we should drag
>         them in.
>
>         On 8/23/12 10:46 AM, Mikel Maron wrote:
>
>             One thing I'm pondering is how to efficiently and easily
>             share time
>             aware geodata. Prior to Google gifting the world spherical
>             mercator
>             tiles, web maps were rendered on request, based bounding box,
>             dimensions, projection. WMS was slow. Naturally I'd expect
>             we'd use
>             cached tiles for serving time data, but I don't see an
>             obvious way of
>             this not exploding to all arbitrary times in history.
>             Perhaps enough to
>             begin by expanding the tile template to
>             /{time}/{zoom}/{x}/{y}, and
>             maybe limiting time to year or decade or century. Is there
>             something
>             more clever? What ways do historians bring methodical order
>             to the times
>             and eras in history that are of most common interest and
>             utility?
>             * Mikel Maron * +14152835207 <tel:%2B14152835207> @mikel
>             s:mikelmaron
>
>
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> --
> Jeff Meyer
> Global World History Atlas
> www.gwhat.org <http://www.gwhat.org>
> jeff at gwhat.org <mailto:jeff at gwhat.org>
> 206-676-2347
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>