[Imports] Encarnación, Paraguay / Center's buildings Import

Lucy Ganchozo Llano lucyganchozo at gmail.com
Fri Dec 15 13:35:04 UTC 2017

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


2017-12-13 18:19 GMT-03:00 Rafael Avila Coya <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
> 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
> [2] https://www.dropbox.com/s/zjgtiyqh0whuuez/lackImportantBuild
> ings.png?dl=0
> [3] http://wiki.openstreetmap.org/wiki/WikiProject_Bhutan/Thimph
> u_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/>'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
>> More details are available here:
>> https://wiki.openstreetmap.org/wiki/User:Lucyintheskypy
>> Regards,
>> Lucia Ganchozo.
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