Hanno's blog

Ich habe heute einen XML-Auszug der OpenStreetMap-Daten von Murrhardt erstellt:

http://files.hboeck.de/osm/

Um dies vom eigenen Ort durchzuführen, erstellt man in JOSM einen Weg um den Ort. Da JOSM die Daten eines ganzen Ortes nicht performant laden kann, habe ich das Polygon mit den Landsat-Bildern erstellt und nur an einigen Orten zum Nacharbeiten die Daten geladen.

Der Weg muss die Tags polygon_file=ortsname und polygon_id=1 haben. Anschließend speichert man den Weg alleine in eine .osm-Datei. Mit dem Skript osm2poly.pl erstellt man daraus ein Polygon-File. Anschließend kann man mit osmosis und einer osm-Datei (in meinem Fall die von Baden-Württemberg, diverse Kartenauszüge gibt es hier):

java -jar osmosis.jar --read-xml file="baden-wuerttemberg.osm" --bounding-polygon file="poly" --write-xml file="murrhardt.osm"

After some more »out of memory«-messages by josm, I thought it's time to look out for alternatives.

For the openstreetmap-project, the two main editors are josm (java) and potlach (flash). I think using java probably wasn't a very wise decision (I still wonder how an app can get »out of memory« after loading about 5 MB of images, do they create a pixel class and store every pixel in an object?) and I don't like flash either.

There's another project called merkaartor and today I had a look. My first feeling is that it's promising. It has good performance, it does nice live-rendering and it supports the basic features (adding nodes and ways, up/downloading stuff to the osm-system).

Sure, comparing to the large list of plugin features josm has, it's limited. Maybe I'll try to hack in some bits I'm missing at the moment.

In my continuing effort to improve gentoo for geo-related stuff, I've just added a merkaartor package to portage.

I recently added some stuff to gentoo for openstreetmap and gps-related work.

For one, the java openstreetmap editor josm now has ebuilds. josm and josm-plugins, the first only installs the program itself plus language packs, the second installs most of the josm-plugins available. They can be enabled within the configuration.
I was a bit unsure how to handle it, as I first thought about adding some basic plugins to the josm-package itself. But as the opinions on what »basic« plugins are seem to differ a lot, I decided to do it this way.
Another new package is gebabbel, a gui-frontend for gpsbabel. gpsbabel is a commandline-tool that implements various proprietary gps coordinate formats and allows access to many gps-devices (e. g. garmin). Beside it can be used to filter and convert gps-tracks.

More to come. Probably also interesting stuff in portage is gpsdrive (which has some osm-stuff in svn, but not yet in a release), marble (world-view-tool for kde, osm-support is planned within the next months). Other stuff not yet in portage, I plan to make packages in the future: tiles@home, qlandkarte, mapnik and probably everything it takes to run an osm-server.

A bit offtopic, as gentoo doesn't run on mobiles (yet): Mobile Trail Explorer is the only free (as in freedom) software I found for J2ME-mobiles to create gps-tracks. It's a bit alpha, lacking some features and unstable, but it's free, so I hope it'll become better soon. It's a cheap way to get gps-tracks, assuming that you already have a java/bluetooth-mobile and you can get a gps-mouse starting at about 50 €.

If you have more suggestions for gps/osm-related stuff, feel free to open requests on the gentoo bugzilla and add me to the cc.