[Imports] Polish Forests - Imports
grzegorz at sapijaszko.net
Wed Apr 17 20:40:40 UTC 2013
to: imports@, talk-pl@, zarzad@
guided by pnorman (thanks, Paul) I would like to mention, that the
Stowarzyszenie OpenStreetMap Polska (Association of OSM Poland)
officially requested and received data of national forests from Lasy
Państwowe (The State Forests National Forest Holding) and would like to
import part of the data to OSM.
The existing Polish forests in OSM has main three sources of data: was
imported from UMP, or was created by users based on (un)aligned
Bing/Landsat or was created/imported from CLC2000. Very often the
quality of the data is poor; very often there are a big areas without
The data which is considered to be imported contains the borders of
forest's sections (small areas of the forest, about 5-20 ha) divided by
It is hard to estimate how much data will be imported/deleted, but using
the official forest's data we can increase the coverage of forest from
~23% to ~29% for whole country.
The import procedure will be:
: to prepare the data in qgis (simplify the structure and shapes of
data, remove unnecessary and add additional fields etc;
: to load the data in JOSM and compare with existing one --- after a
long discussion within local community (on #osm-pl at irc and during a
meeting in Łódź on last weekend) we decided to do it manually. The
reason for it is that very often existing forest's borders are the parts
of complex relation, and also we have a lot of private forests, which
aren't covered by the State Forest's data.
: add (or replace when needed) the data in OSM.
Additional information about the data is located under
Any suggestion will be appreciated.
Grzegorz Sapijaszko (gsapijaszko)
More information about the Imports