[OSM-newbies] Downloading only updated tiles

[Risto H. Kurppa]

Hi!

I've been trying to find a way to download only the updated tiles. I'm
currently using OpenMoko Freerunner and TangoGPS (both to navigate and
contribute to OSM). I download the maps with tangogps.

Now the thing I don't get: what's the best way to update the maps I've
downloaded. I have maps from several areas, some 300 MB maybe. I know
I could just delete all those files every thursday and tell tangogps
to download it all again but it's a waste of time (to scroll here and
there with tangogps and download time) and bandwith: why to download
300MB if there's only say 10 tiles updated?

So is there a way to update my local maps so that only the changed
tiles would be downloaded? rsync that checks if the file is changed
and then updates? I wonder if there really is not a tool or OSM API
that could do this, I'd think it's pretty important feature for anyone
using or contributing to OSM.

I've tried asking around this in some places but so far I got around 0
answer. So if you can help me, please do, if not, guide me to someone
who can.


r

btw. what programs you use to download tiles?


-- 
| risto h. kurppa
| risto at kurppa dot fi
| http://risto.kurppa.fi