But how much information is in a map, and how much in the relationship
database? Presumably you can put some v. rough figures on that for a given
country or area. And the directions presumably cover journeys on roads? Or
walks in any direction and between any spots too?
All of the information in the map is in the relational database because the
actual map is produced from the database (and information doesn't appear
from nowhere). Or, to be clearer, almost *any* map you can buy today
started life in a relational database. That's how the US government stores
it's maps. That's how virtually all modern map printers store their maps
because it's the most efficient way to store map information.
The directions don't need to assume roads. They do so because that is how
cars travel. The same algorithms will handle hiking paths. Very slightly
different algorithms will handle off-road/off-path and will even take into
account elevation, streams, etc. -- so, to clearly answer your question --
the modern map program can do everything that you can do with a map (and
even if it couldn't, the fact that the map itself is produced solely from
the database eliminates your original query).
----- Original Message -----
From: "Mike Tintner" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, October 20, 2007 9:59 AM
Subject: Re: [agi] Human memory and number of synapses
MW:> Take your own example of "an outline map" -- *none* of the current
high-end
mapping services (MapQuest, Google Maps, etc) store their maps as images.
They *all* store them symbolicly in a relational database because that is
*the* most efficient way to store them so that they can produce all of
the different scale maps and directions that they provide every day.
But how much information is in a map, and how much in the relationship
database? Presumably you can put some v. rough figures on that for a given
country or area. And the directions presumably cover journeys on roads? Or
walks in any direction and between any spots too?
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