[Talk-ca] Building Import update

[john whelan]

I'm hearing we keep the single import project as such.

I'm hearing that we should preprocess the data first splitting out outlines
that meet Pierre's right angle checks.  This data can just be imported
using the current processes.

I'm hearing we should then run the correcting scripts and extract the
corrected buildings.  This becomes the second stage.  This data should be
imported separately to the first since it needs to be more closely
inspected in case the script has caused some deformation.

At the moment I'm not sure if the two scripts above exist.

I'm hearing what is left becomes the third stage which needs to be sorted
out manually before being made available for import.  Again I see this as a
separate task since the outlines will have been modified from the original.

Note to James is the above practical?  Do we have the resources to do it?
Please do not do anything until we have an agreement to proceed.

I'm hearing the existing imported building outlines will be subject to an
overpass to pick out those building outlines that are not square.

Then the "a miracle occurs" box on the project plan gets these into a JOSM
todo list and mappers manually sort them out.  I'm not certain how this
will happen.  I suspect if the overpass query is small enough and the
buildings are loaded up from an off line source this might work.

To come back to Toronto my feeling is this is best left to the local
mappers in Toronto to decide how to proceed.  There is/was room for a local
coordinator in the project plan.  Nate's expectations are different to mine
and I think it makes sense for the local mappers to decide what they would
like to do together with Nate and a Toronto mapper set themselves up to
coordinate in Toronto.  The speed at which the buildings were added has
been raised as a concern.  I'm unable to think of a way to address this
other than a "please take it slowly" added to the instructions.

Again this option is available to any other areas who would like to use
this method.

I feel for Quebec the best thing to do is hold back until we have an
agreement for the rest of the country since there are Quebec mappers who
are not following this thread on talk-ca and to be honest we do seem to be
evolving on a hourly basis so waiting until the dust settles might well be
sensible.

Am I missing something apart from my sanity?

Thanks John

On Sun, 3 Feb 2019 at 17:07, Pierre Béland <pierzenh at yahoo.fr> wrote:

> Je suggère oui, d'abord le script avec 2 fichiers d'output parce
> qu'ensuite il sera beaucoup plus simple d'importer les données déja
> corrigées. Sinon une variable pour distinguer les deux et risque de
> l'importer dans OSM ? Et je pense à un autre aspect. Le script pourrait
> s'assurer qu'il n'y a pas de superpositions entre bâtiments une fois les
> données corrigées.
>
> L'importation des données orthogonales devrait être grandement facilitée.
> Selon l'exemple d'Ottawa, quelque 75% des bâtiments répondent à ce critère
> une fois les polygones qasi-orthogonaux corrigés. Pour ces données, il
> s'agirait davantage de valider avec l'imagerie et de faire la conflation
> avec les données existantes.
>
> Pour l'importation des données irrégulières, il faudrait oui valider /
> corriger. A ne pas oublier que dans ce cas on retrouve des angles qui
> s'éloignent de plus de 5 degrés vs données orthogonal. C'est visuellement
> facile à repérer.  Souvent, il s'agirait simplement avec JOSM d'utiliser la
> touche «Q» pour orthogonaliser.  De nombreux appendices de batiments on un
> angle prononcé dans le fichier et cela peut etre redressé à 90 degrés. Le
> greffon ToDo est très utilie pour réviser successivement des données et
> s'assurer de toutes les réviser.
>
> A titre d'exemple, on peut décider d'orthogonaliser le bâtiment ci-dessous
> avec beaucoup d'angles se rapprochant de 90 degrés mais avec une variance
> plus grande que +-5 degrés. Pour détecter davantage de bâiments
> quasi-orthogonaux, il serait possible de tenir compte de cette situation
> uniquement pour angles à 90 avec critère tolérance +-10 degrés. Je vais
> tester cette option et voir si cela permettrait de détecter un grand nombre
> de cas.
> angles entre 82.6 et 94.5 degrés
>
> {82.6,85.7,87.4,90.3,96,94.5,85.5,84.8,91,90.8,89.3,89.8,90.4,91.1,91.1,93.6,87.1,82,87.3,84.7}
> https://www.openstreetmap.org/way/479048070
>
> Pierre
>
>
> Le dimanche 3 février 2019 15 h 45 min 33 s HNE, john whelan <
> jwhelan0112 at gmail.com> a écrit :
>
>
> I accept the nicest way is to check the data beforehand.  Scripting it is
> fairly simple.  Are you suggesting a two stage process of take the data and
> run the script first then task manager the data to be imported to manually
> correct the data?  My eyesight isn't good enough to pick out none right
> angled corners so is there some way someone can come up with to feed them
> into a JOSM todo list?
>
> However we have a fairly large number of building outlines that have
> already been imported.  The issue here is different as extra tags have been
> added.  Can the questionable ones be identified in such a way that a JOSM
> todo list can be used to correct them rather than throw out all the work
> that has been done adding tags?
>
> I think you are assuming a more top down management arrangement than
> exists with volunteer Canadian mappers.
>
> Thanks John
>
>
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