[Talk-ca] which tags in canvec? was: canvec2osm update (an easy question this time)

Thu Jun 25 22:18:38 BST 2009

Thanks Richard :)
do we have a 2ndr for that motion?

Happy to hear u were able to run the script. As you say, it didnt work
right. The next version will be packaged to include all the different
rules.txt files needed. (perhaps it should be called pre-beta) im
surprised it actually worked :-) Sorry for your wasted time running
the BETA script. (but its appreciated)

Maybe others can comment or +1, on ideas u noted?

I think we all agree that before importing all of Canada, we want to
be as close to 100% certain as possable. Although its possable to
revert and mass-change, getting it 'best' we can 1st time through is
'best'.

Great ideas, thanks for all the imput and great detail.

Do we prefer if the extra details get made into wiki pages for each
feature? Rather than leave users to check the .pdf.
Id prefer the wiki because the charts are sortable and more easy to
read than the pdf. -im asking now, in hopes to save me work. (it took
a week to add in all the canvec details to the script & chart) which
is 100% accurate. And yes, the CanVec pdf has spelling errors (and
redundency & inconsistancy that  could be fixed).

Cheers,
Sam

On 6/25/09, Richard Weait <richard at weait.com> wrote:
> On Wed, 2009-06-24 at 22:56 -0700, Sam Vekemans wrote:
>
> [ ... a lot of stuff ... ]
>
>> Anyway, i uploaded a couple sample features to Port Renfrew, BC
>>
>> http://www.openstreetmap.org/browse/relation/163132
>>
>>
>> What tags should be removed??... but more importantly, WHY..
>
> Hi Sam (and list),
>
> Others have suggested that you are including too much from canvec in the
> import.  I agree.  Much of what you are importing can be dropped without
> hurting OSM.
>
> These should stay.
>
> created_by = canvec2osm
> landuse = residential
> source = CanVec_Import_2009
> attribution = Natural Resources Canada
> canvec:UUID = 11CF43A8C213E5F4E0409C8467120387
>
> Sam, you say on the canvec2osm page[1] that v0.74 is the latest
> canvec2osm zip file.  Some older versions are found at your site[2] but
> not v0.74 or several others.  It also looks like you have started
> uploading sample area .osm files with similar names to the script.zip
> files.  Confusing!
>
> I think most of what you are putting into the sample[3] should be
> removed and can be safely removed.  Here's what I've done:
>
> I've run the canvec2osm V0.22 script for a large portion of southern
> Ontario.  This created over 1,300 files.
>
> Then I looked for unique data in each of the tags.  For example I found
> that in over 1300 files "canvec:PROVIDER" had only five values and two
> were duplicates.
>
> canvec:PROVIDER = Federal
> canvec:PROVIDER = federal
> canvec:PROVIDER = municipal
> canvec:PROVIDER = Provincial/territorial
> canvec:PROVIDER = provincial_territorial
>
> This adds almost zero value to OpenStreetMap and it would be damaging to
> OSM to include this data in every item imported from CanVec.  I can't
> imagine that a large number of OSM users would care if data came from
> the town, province or federal government for each node and way.
>
> These should stay.  They are appropriate and useful to OSM users and
> tools.
>
> created_by = canvec2osm
> landuse = residential
> source = CanVec_Import_2009
> attribution = Natural Resources Canada
> type = multipolygon
>
> These should be removed.  The tags above tell those interested that the
> data came from CanVec.  If they need to know more, they can find their
> way through the wiki and svn.  Lots of duplication here.
>
> canvec:CODE = 1370012
> canvec:datasetName = 092C09
> canvec:generic_code = 1370009
> canvec:min_size:CODE = 1370009
> canvec:source = CanVec_Feature_Catalogue_Edition_1_0_2.pdf
> canvec:entity = Residential area - ( Zone résidentielle )
> canvec:value = Residential area - ( Zone résidentielle )
> canvec:Theme = BS Buildings and structures
>
> No canvec:source, just "no".  This tag appears over 385,000 times in my
> sample area.  The value is always
> "CanVec_Feature_Catalogue_Edition_1_0_2.pdf"  No way.  Put it in the
> wiki.  The only folks likely to care are the ones who are working on the
> import.
>
> Next was
> canvec:Planimetric Accuracy (CMAS)
>
> First, "canvec:Planimetric Accuracy (CMAS)" as a key is broken.  Keys
> must not include spaces.  Second, I think it should be dropped from the
> import even if the key is fixed.
>
> In over 1300 files the only values for this key were:
>
> -1,0,3,5,10,21 and 30.
>
> Not much to choose here.  And not much to learn from adding this tag to
> every node and way.  I say drop it entirely OR use k=canvec:accuracy,
> v=value and only include it for the worst of the data, like values >=21
> meters.  That would add value for OSM users by making it obvious that an
> item could possibly be improved by a consumer-grade GPS with a good fix.
> >From my sample only 45 objects out of ~400,000 have these poor accuracy
> values.
>
> Or, alternately, drop any data with accuracy >=21 meters and don;t
> include it in OSM.
>
> canvec:VALDATE is similar.  Best would be only to include valdate when
> valdate is older than ten years, as something that an OSM mapper could
> reasonably bring up-to-date.  Or just don't import anything older than
> ten years old.  But I say drop VALDATE entirely, but I'm willing to be
> convinced otherwise.
>
> And what is this stuff?  Details on how they classified the data when
> they collected it?  And did CanVec really misspell "tolerance" twice?
> This is not adding value in the OSM database.  Leave it in the wiki or
> let people track it down in the canvec documents if it is important to
> them.
>
> Drop all of these:
> canvec:min_size:area_sq_meter = 1000
> canvec:min_size:lat_distance_meter = 1.5
> canvec:min_size:length_meter = ---
> canvec:min_size:long_distance_meter = 3
> canvec:min_size:right_angle_tollerance_degree = ---
> canvec:min_size:spike_angle_tollerance_degree = 10
>
> Best regards,
> Richard
>
> [1] http://wiki.openstreetmap.org/wiki/Canvec2osm
> [2] http://www.acrosscanadatrails.com/Home/
> [3] http://www.openstreetmap.org/browse/relation/163132
>
>
>
>
>
>
>
>
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