[Historic] the "spherical mercator" of time?

[Mikel Maron]

> 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 base map tiles, I'm thinking about features similar to what's captured in OSM ... physical characteristics, administrative borders (Dan's map is awesome btw), infrastructure like roads, names. Other kinds of features, I suppose, tend to be better structured as overlays. For scalability, might be interesting to consider adding some notion of time to utfgrid http://mapbox.com/developers/utfgrid/


 
* Mikel Maron * +14152835207 @mikel s:mikelmaron


>________________________________
> From: Jeff Meyer <jeff at gwhat.org>
>To: Dan Vanderkam <danvdk at gmail.com> 
>Cc: historic at openstreetmap.org 
>Sent: Thursday, August 23, 2012 12:59 PM
>Subject: Re: [Historic] the "spherical mercator" of time?
> 
>
>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> 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> 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 @mikel s:mikelmaron
>>>>
>>>>
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>
>
>-- 
>Jeff Meyer
>Global World History Atlas
>www.gwhat.org
>jeff at gwhat.org
>206-676-2347
>
>
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