[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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