[OSM-talk] Proposal for import guidelines
Lester Caine
lester at lsces.co.uk
Wed Sep 26 12:38:11 BST 2012
THEVENON Julien wrote:
> The corresponding processed data that you can find on
> http://cadastre.openstreetmap.fr/data/ are those data downloaded in PDF format
> processed by a C++ script that analyse geometrical forms and colours to extract
> buildings, railways, rivers and produced separated OSM files.
Sees the light :)
SO while we have this type of raster data from as a background in potlatch and
josm and some elements of it in vector files from OS and other sources. You are
having to stitch together 'pictures' and then your 'automatic processing' is
recreating vector data from the 'pictures'?
I understand the problems now ... and it only really works because the pictures
can be simply vectorised.
SO I would be asking if the 'pictures' can be merged to create a single raster
overlay for France to use as a background 'source' which could potentially be
used to trace from, but can be used in conjunction with BING imagery to corss
check? I would classify that as my base import since it's not externally
available? We have several versions of the OS data along with the historic maps
for the UK, and I feel sure that should be achievable in France as well?
The vectorised files are the 'staging layer' and I'm sure that since you are
providing each building as a shape then in the future it should be possible to
maintain a 'building_id' that can be used with the sort of merge tools I am
looking for to handle this type of data?
--
Lester Caine - G8HFL
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