[Freegis-list] time based maps

[Martin, Daniel]

Although I still have a hard time relating these concepts to a street
network, I would suggest that some of the easiest correlations are with
computer network topology.  They are identical concepts.  You can easily
measure the ping time between any two network nodes.  Now we have exactly
what you are referring to.  Computer networks are just easier to gather the
data - you can almost do it in real time.  There's plenty of research
already out there on the subject, and many models and applications that I
imagine could render a street layer the same way they render the network.

Just my 2 cents,
Dan




-----Original Message-----
From: Anselm Hook [mailto:anselm at hook.org]
Sent: Monday, September 23, 2002 4:06 PM
To: Martin, Daniel
Cc: freegis-list at intevation.de
Subject: RE: [Freegis-list] time based maps



No doubt it would look weird but thats just topology.  Maybe a more
comprehensible way would be to show human subjective distance as another
dimension such as say elevation - human slow paths would be suggested by a
steep hill to ascend and descend.

Actually it could be pretty useful even for casual users; a visitor to the
bay area might see that the 280 is *way* shorter than the 101 around rush
hour.

Or squiggly lines could represent slowness; a freeway would look straight
and the slow parallel street would be serpentine.

On Mon, 23 Sep 2002, Martin, Daniel wrote:

> It sounds nice, but I don't understand how a connected network of streets
> can be expressed in units of time.  Often you have a highway with an
average
> traveling speed of 65 mph and right beside it you have a parallel side
> street with an average traveling speed of 20 mph.  The two streets then
have
> perpendicular cross streets connecting them.
>
> Perhaps you see it differently than I do.
>
> -Dan
>
>
>
> -----Original Message-----
> From: Anselm Hook [mailto:anselm at hook.org]
> Sent: Monday, September 23, 2002 2:09 PM
> To: Matt.Wilkie
> Cc: freegis-list at intevation.de
> Subject: Re: [Freegis-list] time based maps
>
>
>
> A friend one mentioned a similar idea - It was appealing - that the actual
> landscape or mental map we have isn't exactly literal.  Some paths are
> longer because of red lights or certain neighhbours we want to avoid.
>
> As you said - you could take an ordinary map and apply a rendering
> deformation based on the 'real' length of the navigation routes in it.
> Sounds great!
>
>  - a
>
> On Mon, 23 Sep 2002, Matt.Wilkie wrote:
>
> > The open source community is often accused of merely "chasing tail
lights"
> > instead of actively engaging in developing truly innovative features.
Well
> I
> > believe I've identified an area which addresses a real need but for
which
> > there are no tools available (that I'm aware of) - proprietary or not.
> >
> > Time based maps: the base units of measurement are *time* instead of
> space.
> > The length of a highway line on a map represents how long it takes to
> drive
> > from Berlin to Paris, not how many kilometers apart they are.
> >
> > Most of the time when people ask how far away the next town is, they
don't
> > really want to know how far it is, but rather how long it will take them
> to
> > get there.
> >
> > I envision a set of georeferenced vectors with database attributes that
> > indicated the quality of the road and the posted speed limit. When the
> > cartographer creates the map she decides on a scale of 1cm:10min and
> selects
> > the vector(s) which the map will be centered on. The software tool then
> > expands/contracts the length of the vector(s) to match and surrounding
> > topography is rubber-sheeted or morphed accordingly.
> >
> > Naturally not everybody travels the same way. Some have ferraris, others
> > freightliners, still others prefer bicycles and some just like to walk.
> This
> > just begs for an internet mapping application where the user can chose
> their
> > method of conveyance.
> >
> > Also consider the application in large cities where the traffic density
> > could be taken into account and near real time maps depicting how long
it
> > will *really* take to get to work this morning are shown.
> >
> > BTW, I can't take any credit for this idea, it's not mine. I've been
> > thinking about for some years, ever since I saw some Inuit drawn maps
from
> > the 18th/19th century showing the northern coastlines of Canada. In my
> > youthful arrogance I commented on how primitive the maps were, lacking
all
> > concept of projection or relative size. My teacher then demonstrated how
> the
> > maps were actually incredibly accurate -- if one were paddling in a
kayak
> > and keeping track of how long it took to get to the next base camp.
Score
> > another one for "primitive" societies.
> >
> > cheers,
> >
> >
> > -- Matt Wilkie
> > --------------------------------------------
> > Geographic Information,
> > Information Management and Technology,
> > Yukon Department of Environment
> > --------------------------------------------
> >
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> >
>
>
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