[Talk-ca] Fwd: GeoBase vs CanVec

[john whelan]

I wanted to be able to display the Ottawa street names in French so
needed to add a name:fr field in an automated way.  The Ottawa streets
that weren't named or had Rd. etc. weren't so much of a problem, they
got cleaned up manually first but I came across more than a few that
were tagged with an incorrect name and I suspect there are still some
more lurking in there.

I think this is one of the difficulties with OSM how do you handle
existing data when something better comes along.  What is the
objective, to create a reliable accurate map or create an historical
record of people's edits.  I know I'm bias and it shows.  At least I
can add my favourite coffee shops and there is no disputing their name
or where they are, just follow the gps trace.

I like the Geobase data import since it at least put the roads in the
correct place.  Parts of Ottawa only had the low resolution satellite
data available and some of the roads were not as close as one might
like, which of course caused problems as the import process sought to
protect existing data.

Cheerio John

On 23 August 2010 17:59, Steve Singer <ssinger_pg at sympatico.ca> wrote:
> On Mon, 23 Aug 2010, john whelan wrote:
>
>> The CANVEC tiles contain the full street name.  Ottawa has a number of
>> streets that were imported from Geobase that did not include a street
>> name, contained abbreviation or only part of the name.
>>
>> This maybe because of the way the import was done but the CANVEC data
>> seemed cleaner in this regard.
>
>
> The Ontario road network imported into OSM came from version 5 of the
> GeoBase release (that was the newest version of the time).  v5 of the
> Ontario geobase road network had no road names in Ontario.  When I did the
> import I took the road names from the StatsCan data and matched them to the
> Geobase road geometries.
>
> The Canvec files Daniel is now producing I think include data from the v6
> Geobase road network.  These do include road names (and presumably have
> other updates).
>
> Someone could probably write a script to go through the v6 geobase data and
> update the matching OSM roads with the more up-to-date names and better
> geometries, but I'm leaving that as an exercise to the reader.
>
> Steve
>
>
>
>>
>> Cheerio John
>>
>> On 23 August 2010 09:14, Bégin, Daniel <Daniel.Begin at rncan-nrcan.gc.ca>
>> wrote:
>>>
>>> Hi Brendan,
>>>
>>> "John" described the difference between Canvec and GeoBase pretty well!
>>>
>>> Daniel
>>> ________________________________
>>> From: talk-ca-bounces at openstreetmap.org
>>> [mailto:talk-ca-bounces at openstreetmap.org] On Behalf Of JOHN SMART
>>> Sent: 20 août 2010 20:46
>>> To: Brendan Morley; talk-ca at openstreetmap.org
>>> Subject: Re: [Talk-ca] Fwd: GeoBase vs CanVec
>>>
>>> G'Day Australian Mapper
>>>
>>> Perhaps someone from Natural Resources Canada (the Federal mapping
>>> agency)
>>> could give a better answer, but my understanding is:
>>>
>>> - CanVec originated from the NTDB (National Topographic Database) which
>>> is
>>> essentially the same data as is used for the (sometimes quite out of
>>> date)
>>> 1:50 000 scale National Topographic Series maps. That is all Federal
>>> data.
>>>
>>> - GeoBase is an initiative which aims to reduce duplication of work /
>>> costs
>>> by having Provinces (equivalent to Aus. states) or other entities supply
>>> "best" data to the Feds.
>>>
>>> Thus GeoBase would actually be an example of the left hand working in
>>> partnership with the right hand.
>>>
>>> I believe CanVec is being updated with any better sources as they become
>>> available, e.g. National Roads Network (NRN) gets migrated into new
>>> editions
>>> of CanVec.
>>>
>>> I believe there are many data themes that are in CanVec which are not in
>>> GeoBase, and presumably never will be in GeoBase unless the initiative is
>>> extended to include agreements for those themes.
>>>
>>> If I have misunderstood anything I'd be delighted to be corrected.
>>>
>>> Now, what is "CommonMap"? I had never heard of that until now. A quick
>>> web
>>> search gets me here:
>>> http://commonmap.info/w/index.php/Main_Page
>>>
>>> It looks to me like it is a very similar concept to OSM, apart from
>>> licensing perhaps. So it makes me wonder if we have a "left hand - right
>>> hand" situation there?
>>>
>>> John
>>>
>>>
>>> ________________________________
>>> From: Brendan Morley <morb.gis at beagle.com.au>
>>> To: talk-ca at openstreetmap.org
>>> Sent: Fri, August 20, 2010 9:11:10 PM
>>> Subject: Re: [Talk-ca] Fwd: GeoBase vs CanVec
>>>
>>> Also, I assume if I were to import GeoBase data into CommonMap, I should
>>> follow closely the rules implemented in
>>>
>>> http://svn.openstreetmap.org/applications/utils/import/geobase2osm/geobase2osm.py
>>> ?
>>>
>>>
>>> Brendan
>>>
>>> On 21/08/2010 9:52 AM, Brendan Morley wrote:
>>>>
>>>> Hello Canadian mappers,
>>>>
>>>> Sam Vekemans suggested I ask the following here:
>>>>
>>>> What is the relationship between CanVec data and GeoBase data?
>>>>
>>>> To this layperson they seem to be two initiatives hosted by the same
>>>> government that seem to have similar objectives.  Almost like the left
>>>> hand
>>>> not talking to the right hand.
>>>>
>>>> Can anyone explain briefly the differences?  For example, it seems to me
>>>> that GeoBase is "closer" to the data authors, and CanVec feeds from
>>>> that,
>>>> and CanVec concentrates on having complete coverage at particular scales
>>>> (like 1:50k).
>>>> Am I on the right track?
>>>> Is there a government document that goes into detail?
>>>>
>>>> My interest is to pick out the best bits to seed CommonMap with.  I'm
>>>> looking for accuracy and timeliness.
>>>>
>>>>
>>>> Brendan
>>>>
>>>> _______________________________________________
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>>>> Talk-ca at openstreetmap.org
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>>>
>>>
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>>
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