[Talk-ca] Merging OSM + Geobase
acrosscanadatrails at gmail.com
Fri Mar 27 02:15:30 GMT 2009
re: merging data
Yup, everyone handled that question so i dont need too. .. However, i
would recommend posting a summery onto the wiki as a FAQ... as this
question comes up alot. And we do have a definitive answer.
Unfortunately, i tend to drag on and on and on and on.... so someone
else (hopefully) can write it out nicely so it's clear as mud ;-) ...
and on and on and on....
And BTW, im +1 for tackling the Nova Scotia Data next ... rather than
BC... but of course, that script for getting the Stats Can data,
sounds wonderful, and i'm looking forward to trying to understand it.
... fortunately i have a full plate trying to get this CanVec &
geoBaseNHN data all organized.
Is there some way to get around the FME issue? ... perhaps asking
permission from the software creators to allow the sharing of the
process for it. Otherwise, it will be just those people who have the
software that can do it. ... which is fine, .... but it does put a
lot of pressure on them (as know one else can help with the tweaking)
Here's what i got (to try to answer Jonathan's question about the approach)
By working tile-by-tile with importing both the GeoBaseNHN & the
CanVec data at the same time. (or maybe separately... but to keep the
process smooth, going at it all at once make is better) The local
mappers might want todo this;
1- working in area which have already been enhanced with the
GeoBaseNRN, we now having something to go by.
2- 1st view each of the features separately... 1 .osm file at a time. (in JOSM)
3 - load the 'boundary region of the rectangle tile.. and load all
the current OSM data (as a new layer) ... but remember hide it, just
before uploading data :-)
4- use the 'hide/show' option to switch back and forth, and pan around
the whole area to view where that feature (to be imported) is. .. and
when you find possible overlaps ... contact that mapper who did that
work, and decide which version you want to keep.
5 - do this for the whole area, and once your happy with it, then Upload.
6 - (before or after) all the other features are loaded... load eithor
the GeoBaseNRN backup file or the canvec roads file... and have the
file loaded as another layer.
7 - use the roads layer as a 'tracing paper' and view/hide all over
the map and move the osm nodes & stretch the osm ways to line up how
8 - by hiding the 'roads' layer, you can upload the OSM changes back
to the OSM server, without duplicating the data.
I hope this makes sense... perhaps someone else can explain what i
mean better ;-)
FYI: I feel that having 20 mappers all working at different parts of
the country, all doing the same process.. it shouldn't take to long to
get the whole country imported... and done with super careful work and
great coordination. .... this is why i'm bugging people to try and
get these charts PERFECT.. as we don't want to be 1/2 way through and
find out that tags should be changed ;-)
Across Canada Trails
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