Hi Jóhannes,

Am 11.10.19 um 12:44 schrieb Jóhannes Birgir Jensson:
> I'm trying to figure out how to get historical entries of bus stops in 
> Iceland but other than getting lots of old snapshots and parsing them I'm out 
> of ideas.
> 
> Any optimal route to do this?

Take the historic planet file extract for Iceland from
https://osm-internal.download.geofabrik.de/europe/iceland.html and
iterate over the contents of the file. It is ordered by type (node, way,
relation), ID and version. If an object with ID n is visible has
highway=bus_stop in version v and not visible (i.e. deleted) in version
n+1, you have found one of the bus stops you are looking for.

There are multiple options how to do that. The following list is sorted
by performance (slowest last):

(1) Write a small C++ programme using the Osmium C++ library. You can
use
https://github.com/Nakaner/FiTaDel/blob/master/tag_change_checker.cpp as
an example. The exmaple reads a history file and counts objects which
had building=* in version v but building=yes in version v+1 if version
v+1 was uploaded by a user with a given UID.

(2) The same but in Python using Pyosmium.

(3) osmium cat --output-format=opl iceland-internal.osh.pbf \
  | grep -A 1 "highway=bus_stop" \
  | grep -v "highway=bus_stop"

Best regards

Michael



-- 
Michael Reichert      www.geofabrik.de
Geofabrik GmbH        Handelsregister: HRB Mannheim 703657
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76133 Karlsruhe       Tel: 0721-1803560-3
reich...@geofabrik.de Fax: 0721-1803560-9

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