[Imports] Province of Biella open data import
musuruan at gmail.com
Mon Dec 5 14:09:23 UTC 2016
I amened the wiki page specifying the licensing details as
previously discussed in this thread.
Since there has been no additional feedback for the last 12 days, I
think we can go on with the import.
On Wed, Nov 23, 2016 at 10:38 PM, Andrea Musuruane <musuruan at gmail.com> wrote:
> Hi Frederik,
> On Wed, Nov 23, 2016 at 7:20 PM, Frederik Ramm <frederik at remote.org> wrote:
>> your Wiki page does not give an example of the data to be imported.
>> Which properties are present in the source data, and how are you going
>> to convert this to OSM tags?
> Probably you haven't found them.
> The 3rd line in "about" section states:
> There are specific pages about importing: address, building, toponym
> and road data.
> address, building, toponym and road are links to specific pages.
>> This is a crucial step where lots of things can go wrong. For example,
>> you say you want to import "topoynms" - of course we want to know what
>> kind of topoynms these are and how you intend to tag them in OSM. Or you
>> say you ewant to import roads - but of course the source data isn't
>> going to use OSM road classification, so what are your plans here? And
>> so on.
> Clicking on the toponym link you will open the following page:
> There is a section about data transformation. There is a link to the
> ogr2osm translation script, inside the script you can find how the
> actual transformation works. You can also find a link to the actual
> OSM XML result file.
> Road data is a bit more complex:
> We won't import road data for every town but just for the few that are
> poorly mapped. We will use cygnus tool to conflate the data.
> All ogr2osm translations scripts can be found at my github repository
> which is linked in the every specific import page in the wiki:
>> Also, there are two very imporant things in your Wiki page that I
>> implore you to take seriosly:
> I'm sorry but I find your tone not really appropriate.
> You know, I spent a lot of time in the last months with these import procedures.
> I talked with Martin and Gabriela from Telenav to analyse if it was
> possible to use the cygnus tool to conflate OSM and road data.
> I wrote the ogr2osm translation scripts and I made many revisions to
> correct transformation errors.
> I talked with the upstream data owner to fix errors in the open data
> they provide.
> The upstream owner is also very sensible and released updated data
> sets for our import effort.
> Moreover I spent another bunch of time trying to document everything
> in the wiki. It may not be perfect and there may be errors, but I
> think it is much above the standard quality of import procedures I
> find listed in the import catalogue.
>> 1. "The dataset will be loaded in JOSM and it will be merged with
>> existing OpenStreetMap data manually and prior to the upload."
>> Do not underestimate this process. Sadly, often enough an import claims
>> to be merging things with existing data, and in practice, people don't
>> have the patience and just delete existing data and replace it. Please
>> make sure this doesn't happen.
> I already made an import in the past, regarding the address data for
> the City of Biella:
> I know how many patience you must have and I know that most of the
> time will be spent in QA.
> About existing data. What I aim is quality. There are things in OSM in
> this area which are made very very well. For example I find road data
> particularly good. Other data, such as buildings, are very poorly
> drown. The mapper often roughly draws the outline of a group of
> buildings using aerial imagery, not even caring to orthogonalize the
> shape if necessary.
> Every time we will have to choose the best data and I assure you we
> will be very careful about it.
>> 2. "A local mapper MUST choose the towns he knows best."
>> You currently have two collaborators listed, and it is unlikely that
>> between the two of you, you know every place best. This logically means
>> that some parts of the import will have to wait until someone is found
>> who knows the area well. Many importers start out with big plans for a
>> community import, and then end up importing everything themselves when
>> they can't find other local community members to help quickly enough.
>> Please don't succumb to this; if your import takes longer then it takes
>> longer, but don't run off and import all the towns yourself just because
>> you want it finished.
> We are two for now, and hopefully there many be some more coming.
> Please note we are talking about a very small province in Italy -
> about 900 km² and less than 180k inhabitants - where a good part of
> its land is covered by the Alps. A province I know very well and that
> I already extensively mapped as my OSM history easily reveals.
> The other collaborator listed is working for the data owner - and
> actually worked in collecting the data.
> In contrast I see the Los Angeles (about 1300 km² and 4M inhabitants)
> buildings import page lists only 7 people:
> I have no rush to end this import quickly and I already spend much of
> my time in OSM doing Quality Assurance.
More information about the Imports