[Imports] Encarnación, Paraguay / Center's buildings Import
Rafael Avila Coya
ravilacoya at gmail.com
Fri Dec 15 14:18:53 UTC 2017
Hola, Lucía:
Nice! And don't hesitate to come to this list to ask for help!
Saludos,
Rafael.
On 15/12/17 14:35, Lucy Ganchozo Llano wrote:
> Thank you very much for all the observations.
> Given the fact it is the first time we import buildings in OSM, we will
> review all the steps considering your recommendations for a better
> procedure.
>
> Regards.
>
> 2017-12-13 18:19 GMT-03:00 Rafael Avila Coya <ravilacoya at gmail.com
> <mailto:ravilacoya at gmail.com>>:
>
> Hola, Lucía:
>
> Thank you for submitting this import for review and with the goal of
> improving the map of Paraguay :)
>
> First: have you discussed this import with the local Paraguay OSM
> community? This is compulsory as per the import guidelines [1].
>
> You say this will be a one time import, but I've spotted more than
> 1770 buildings already in the area you want to do the import. In the
> wiki you say "none" under Conflaction section.
>
> I see that many important buildings all around the import area are
> left behind unmapped, while next to them, smaller ones are mapped.
> This will lead to an inconsistent and a bit weird map. See this
> image [2].
>
> Data quality: Just running the JOSM validator, I can see:
>
> Errors:
>
> 1) 657 duplicated nodes and 1 one node ways (that can be fixed with
> the JOSM validator)
>
> 2) 16 ways containing segment twice (no possible to fix with the
> validator).
>
> Warnings:
>
> 1) 15 duplicated nodes. Fixable with validator.
>
> 2) 9676 overlaping ways. Non fixable with validator. With such a
> huge number of ways, you can expect all kind of errors. I've just
> checked the first 3, and saw a duplicated building, and two
> buildings that overlap over other 2 or 3 buildings.
>
> 3) 21 self-crossing ways. Non fixable with validator.
>
> 4) 668 self-intersecting ways.
>
> 5) 8 nodes without tag and not connected to any object. Fixable with
> validator.
>
> Such amount of geometry issues should be solved *before* any attempt
> to import this data to OSM, not after.
>
> Tagging: you don't mention specifically that you will delete all
> original tags from the original dataset (probably you forgot). In
> any case, there might be tags that could be interesting to use if
> they give info we could use for OSM. What I mean is that maybe (or
> maybe not) NRO_MZ, ZONA, ESTADO or LOTE could be of use if they are
> related to real things we can map, like names of administrative
> entities for example.
>
> Changeset tags:
>
> I would add:
>
> import=yes
> url=https://wiki.openstreetmap.org/wiki/User:Lucyintheskypy
> <https://wiki.openstreetmap.org/wiki/User:Lucyintheskypy>
>
> Note that it's more convenient to have the import wiki in a more
> general folder, like under Paraguay wiki for example.
>
> Import user: No reference to what user you want to use for this
> import. Every import has to be done with an ad-hoc user, not a
> standard OSM user.
>
> Note that I don't say this import isn't interesting, just the
> contrary. But as it is now, it needs quite a lot of improvement
> before we can safely import the data.
>
> As you can see from my comments, some issues can be solved easily,
> but others are not. And they are many.
>
> One possibility would be to have a good group of interested people
> (very prefered if they are paraguayan) and correct the data by areas
> (dividing the data in several parts and giving them to each one).
> That would make the import much more reliable, and more
> collaborative too.
>
> A year ago I organized one import of several types of objects of
> Thimpu city (Kingdom of Bhutan). Among them were building footprints
> [3]. Maybe it can give you some extra ideas on how to improve the
> preparation of the import.
>
> Un saludo cordial,
>
> Rafael.
>
>
> [1] Paso 2. Consultas a la comunidad:
> http://wiki.openstreetmap.org/wiki/ES:Importaci%C3%B3n/Directrices#Paso_2._Consultas_a_la_Comunidad
> <http://wiki.openstreetmap.org/wiki/ES:Importaci%C3%B3n/Directrices#Paso_2._Consultas_a_la_Comunidad>
> [2]
> https://www.dropbox.com/s/zjgtiyqh0whuuez/lackImportantBuildings.png?dl=0
> <https://www.dropbox.com/s/zjgtiyqh0whuuez/lackImportantBuildings.png?dl=0>
> [3]
> http://wiki.openstreetmap.org/wiki/WikiProject_Bhutan/Thimphu_Thromde_data_building_footprints_import_workflow
> <http://wiki.openstreetmap.org/wiki/WikiProject_Bhutan/Thimphu_Thromde_data_building_footprints_import_workflow>
>
> On 13/12/17 21:12, Lucy Ganchozo Llano wrote:
>
> Hello,
>
> I just want to inform that I'm part ofMapPYOSM
> <https://www.facebook.com/mappyosm/
> <https://www.facebook.com/mappyosm/>>'s team and we're going to
> import the buildings from the center of Encarnación, Paraguay.
> By mapping in OSM and doing this import job, we aim to solve the
> lack of a basic cartography in our country: Paraguay.
>
> The data are under ODbL, they're in shapefile format and was
> provided by Ecosistema Urbano, the enterprise hired for the
> elaboration of the Plan Encarnación Más.
>
> https://www.dropbox.com/sh/4c6nyk50fljc1w5/AACULmnSEXBL6qDxxYOILYcOa?dl=0
> <https://www.dropbox.com/sh/4c6nyk50fljc1w5/AACULmnSEXBL6qDxxYOILYcOa?dl=0>
>
> More details are available here:
> https://wiki.openstreetmap.org/wiki/User:Lucyintheskypy
> <https://wiki.openstreetmap.org/wiki/User:Lucyintheskypy>
>
> Regards,
>
> Lucia Ganchozo.
>
>
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