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. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _______________________________________________ dev mailing list [email protected] https://lists.openstreetmap.org/listinfo/dev
