Hi,
On 11/18/2011 10:58 PM, Frederik Ramm wrote:
On Fri, 18 Nov 2011 11:56:53 -0800 (PST)
ThomasB<[email protected]> wrote:
not sure we are using the same script. With osmosis --read-pbf
file=/home/wicking/osm/germany.osm.pbf --write-xml file=- | perl
osm-length-2.pl> /dev/null
I am 15 minutes after the start at 14GB RAM usage and still
increasing.
Yes, the osm-length perl script wastes a lot of memory by keeping all
nodes in a Perl hash. It would be relatively easy to write an efficient
road length calculator based on the Osmium framework; that one should
then work with a far smaller memory footprint.
http://www.remote.org/frederik/tmp/osmium_road_length.cpp
Does all of Germany (from a PBF file) in less than 5 minutes and using
less than 2 GB of RAM. I haven't got the time to do this properly right
now - it just dumps a list of results for all highway types to stdout
and sadly includes all the tag rubbish:
* 0.2km
Access_Ramp 0.0km
Altmarkt 0.2km
FIXME 0.8km
Fußweg 0.0km
Hinterer Spielbach 0.1km
Hohndorfer Weg 1.2km
Privatstraße 0.1km
Sandstraße 0.1km
Weikersdorfer Weg 0.1km
abandoned 23.4km
abandonned 0.3km
abendoned 0.5km
access 0.8km
access_ramp 0.1km
agriculture 0.8km
almost_path 0.4km
animal_pass 0.1km
animal_trail 0.2km
area:<unterschiedlich> 0.1km
bicycle 0.1km
bollard 0.4km
bridge 0.0km
bridleway 2198.5km
bridleway, track 0.5km
bus_guideway 5.9km
...
(full result file for Germany here:
http://www.remote.org/frederik/tmp/osmium_road_length.result)
But anyone with minimal C++ skills should be able to polish that. (If
you do, be so kind and make your polished version available somewhere
stable, e.g. send it to Jochen for inclusion in his examples directory
or so.) A power user might even want to take Peter Koerner's history
splitter which is OSM based and has the ability to cut out OSM data
along polygon boundaries, and add the length formula from this script so
you can easily make a separate counting for lots of places.
Best wishes
Frederik
--
Frederik Ramm ## eMail [email protected] ## N49°00'09" E008°23'33"
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