[Talk-us] a more compressed OSM?

[Nick Black]

Hi Guys,

We are in the process of converting our mobile tiles to 8-bit.  Many
are 8 bit already - it makes things quite a bit faster.

--
Nick
nick at cloudmade.com


On Tue, Sep 14, 2010 at 9:51 AM, Paul Fox <pgf at foxharp.boston.ma.us> wrote:
> jeremy wrote:
>  > On Tue, Sep 14, 2010 at 8:49 AM, Paul Fox <pgf at foxharp.boston.ma.us> wrote:
>  > > not mentioned in that list is RoadMap (http://roadmap.sourceforge.net)
>  > > which was designed for on-the-fly rendering on small devices. Â (a fork...
>  >
>  > seems like that would require a live connection to the net while out
>  > and about. thought it is a phone i do not find the need to pay for an
>  > internet connection on it.
>  >
>  > all saved cache files, i cannot be fetching from servers
>
> i guess i didn't emphasize how small the .rdm files are.  i loaded up
> maps (admittedly they were Tiger-based, not OSM-based, but the
> compiled form isn't much different in either case) for a road trip
> this past weekend.  all of MA, RI, CT, NY, NJ, and PA occupied 275MB.
>
> i just tried a download and conversion of all 25bit quadtiles covering
> a 20mi radius centered on 34.15,-118.348 (i.e., los angeles), and
> while i was cut off by the bandwidth limiter eventually, it looks
> pretty complete and only takes 11M on disk.
>
> there are certainly rough edges:  the label placement code works on a
> quadtile-by-quadtile basis, so name placement collisions occur pretty
> frequently when you're using small quadtiles like that (i think 25 bit
> quadtiles are only 4.8km on a side).  so bigger quadtiles would be
> better.  and roadmap doesn't know how to label points -- just lines
> and areas.
>
> (plus, currently, the developer community is very small -- like just
> two people, and i'm not even very active, currently.)
>
> paul
> =---------------------
>  paul fox, pgf at foxharp.boston.ma.us (arlington, ma, where it's 66.9 degrees)
>
>
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-- 
--
Nick Black
twitter.com/nick_b