This mail is to announce the intention of the Spanish OSM community to
import data from Spanish Cadastre and get feedback from you.
The idea of this import arises with the publication of the license and
access criteria to massive download of data from Spanish Cadastre [1] on
march 2011, which states: "Public use of cadastrial data is permitted,
including commercial use, if such data have been previously transformed
in any way...". Original data is supplied as shapefiles with different
coordinate reference systems. Reprojecting those shapefiles to EPSG:4326
and converting to *.osm format is enough transformation to allow
mentioned public use, according with the reference Spanish "Law of
intellectual property" [2], as established in its article 21, which also
says that copyrights of the transformed product belongs to the
transformer, in this case the (Spanish) OSM community.
Data from Spanish Cadastre is known to have a high accuracy and include
a lot of information of interest for OSM project, such as buildings
(shape, use, height, number of floors, etc.), rural and urban parcels
land use, most of streets and roads of the country, power stations,
tracks and paths, trees... Many of this information is currently in OSM,
mainly ways and roads, but a great part is still missing, specially in
low populated areas where a ground survey is less likely to be made.
This import has been largely discussed on Spanish mailing list, with a
general consensus on the usefulness of the import and a "we must do it"
agreement.
Specific software (cat2osm) is being developed [3] to import data, which
source code is available at Github [4]. It is currently being tested by
some members of the community to get a stable status. Some images of the
preliminary results can be seen at [5]. Transformed data is thought to
be always manually checked in JOSM by osmers knowing the area and only
after that uploaded. The way original data is translated into osm format
by cat2osm tool is documented in [6] and has been established with the
participation of several members of the community.
Specific accounts have been created for the import, one for each Spanish
province [7]. There's a member of the Spanish community responsible of
each province import.
Looking forward for your comments
Carlos Dávila
[1] http://www.catastro.meh.es/documentos/normativa/res_230311.pdf
[2] http://www.boe.es/boe/dias/1996/04/22/pdfs/A14369-14396.pdf
[3] http://wiki.openstreetmap.org/wiki/Cat2Osm
[4] https://github.com/AnderPijoan/cat2osm
[5]
http://wiki.openstreetmap.org/wiki/Cat2Osm#Resultado_de_la_conversi.C3.B3n
[6]
http://wiki.openstreetmap.org/w/index.php?title=Traduccion_metadatos_catastro_a_map_features
[7] http://wiki.openstreetmap.org/wiki/Spanish_Cadastre/results
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