[OSM-dev] Which is best for this task, osmosis, osmconvert osmupdate or...
Dave F.
davefox at madasafish.com
Tue Dec 29 17:41:19 UTC 2015
Hi
I'm a bit unsure which program is best to perform the actions I list below.
I've previously download a file of all OSM data within a rectangular
area. I then use mkgmap to convert it to the format by my Garmin GPSr.
In the future I'd like to change that so it's a multi faceted polygon of
only specified OSM entities.
At present, each time I want to update the file, I'm downloading every
entity, even if they haven't been amended. What I need is to download
any changes within the polygon since I last updated. I read about
minute, hourly & daily diffs. Am I able to state the date I last updated
as the start point for new data?
There appear to be a few programs able to do what I require, but unsure
which is best suited. Is Osmosis a bit overblown for my purpose.
Osmupdate seems a bit more lightweight. Osmconvert appears to discourage
doing what I need:
http://wiki.openstreetmap.org/wiki/Osmupdate#Use_Cases. Overpass also
has a way to download diffs. Anyone used that?
Is it better to work with a raw OSM data file or use a .pbf file? In
fact I'm a bit confused what one is. From the wiki it firstly says
"alternative to the XML format", but then goes on to compare it with a
compressed file format. Which is it?
Your help is appreciated.
Cheers
Dave F.
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