[Talk-tz] Talk-tz Digest, Vol 22, Issue 5
Antidius Kawamala
antidius at dlab.or.tz
Mon Jun 14 13:58:15 UTC 2021
Great, thanks Rafael to reminding us.
Antidius Kawamala
GIS Specialist and Researcher (dLab)
M: +255769806836
Founder of RootGIS<https://rootgis.wordpress.com/>
Skype: Antidius Kawamala | Twitter: @Antidius36
P.O. Box 33335 Dar es Salaam, Tanzania | College of ICT, UDSM- Kijitonyama campus | dLab <https://dlab.or.tz/>
[cid:3cf1accb-2f6e-49a4-a2ca-b0bf4b8de3ba]
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Subject: Talk-tz Digest, Vol 22, Issue 5
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Today's Topics:
1. Re: Import of Tanga Building Footprints (Rafael Avila Coya)
----------------------------------------------------------------------
Message: 1
Date: Fri, 11 Jun 2021 18:15:49 +0200
From: Rafael Avila Coya <ravilacoya at gmail.com>
To: talk-tz at openstreetmap.org
Subject: Re: [Talk-tz] Import of Tanga Building Footprints
Message-ID: <5682c90e-0498-5454-5265-b7be27c90b20 at gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Hi, Antidius:
Thank you very much for your time preparing this import that will
improve the map of Tanzania.
Just some remarks about the import process, so it gets successfully
passed by the OSM community.
Before contacting the HOT (or other worldwide) mailing list(s), you
should had had contacted the TZ community, as you do in this email.
Once the local TZ community is ok with the import, you need (compulsory)
to contact the imports mailing list, to get the final green light for
the import.
Just in case you haven't yet done it, please read the OSM Import
Guidelines [1]. There you can see you that contacting the local osm
community is step 2, and contacting the imports mailing list is step 5.
If you have any question/doubt about the import process, just let us
know and we will be happy to assist you.
Excellent weekend to all,
Rafael.
[1] https://wiki.openstreetmap.org/wiki/Import/Guidelines
O 11/06/21 ás 05:34, Innocent Maholi via Talk-tz escribiu:
> Hi Antidius and team,
>
>
> Thanks for opening up communications about the data import intended for
> Tanga and for sharing the link to the wiki page with the workflow. I'm
> also adding a few other people to this email chain.
>
>
> I have downloaded and checked the Tanga buildings data
> <https://drive.google.com/file/d/1zzuKwMvZCK6_J-_HK8k2eH9KkaADyUrW/view?usp=sharing>,
> this generally looks good and I’d like to congratulate everyone involved
> in the digitization process however a few things stood out to me;
>
>
> *
>
> The use of 2019 imagery seems to be off for digitization as 2 years
> of difference can present outdated data that allows lots of
> differences with the current situation. Correct me if I’m wrong but
> I understand that ARU/dLab has access to 2021 drone imagery of Tanga
> which seems to be perfectly up to date for this work. Did you
> consider this option?
>
> *
>
> The data doesn’t show differentiation between “complete buildings”
> and “incomplete/unfinished buildings” even though the difference can
> clearly be visible (at least with the Bing imagery I have used).
> This is of interest for data users to understand and make
> considerations.
>
>
> Now coming to the OSM data import, this is usually a complex process as
> it needs to be properly conducted and reviewed with the assistance of
> more technically oriented and experienced OSM editors to avoid data
> quality issues and conflicts while keeping the OSM data at its best
> state. Reading through the Tanga wiki page
> <https://wiki.openstreetmap.org/wiki/Tanga_Building_Footprints_Import>you established,
> here’s are a few (not all) comments;
>
> *
>
> There’s no clarity on the workflow between the building data you
> already created and the methodology to have this data in OSM. While
> the import type
> <https://wiki.openstreetmap.org/wiki/Tanga_Building_Footprints_Import#Import_Type>section
> talks about how the community will use the HOT tasking managerto
> import this data to OSM, the team approach
> <https://wiki.openstreetmap.org/wiki/Tanga_Building_Footprints_Import#Team_Approach>section
> suggests that “data import will be conducted by the *University
> experienced OSM mappers* through existing OSM project accounts
> (Living_Lab_Initiative)”. As this contradicts itself, does this data
> import neglect the broader OSM community and its contribution? Do
> the intended university students have (enough) experience with
> large-scale imports like this?
>
> *
>
> The use of HOT tasking manager as suggested isn’t quite captured in
> the “workflow” section. This part only mentions JOSM, OpenData
> plugin, ToDo plugin, and OSM only as the tools/platforms to be used
> for this import. This worries me whether there's a clear and
> understandable workflow to be used for this.
>
> *
>
> QA plans are not quite well established to ensure the good quality
> of the data. The wiki suggests that “Validation of the import will
> be done by a second user in the Tasking Manager”. Who is this second
> user? Is it global OSM contributors? Of what mapping level? Can they
> be trusted with QA? etc.
>
> OSM guidelines suggest that “Take great care to avoid damaging the
> database and don't leave a messy import and assume that nameless
> OpenStreetMap contributors working in iD
> <https://wiki.openstreetmap.org/wiki/ID>and Potlatch
> <https://wiki.openstreetmap.org/wiki/Potlatch>will tirelessly complete
> your work. JOSM is better at untangling messy data, but it's still
> difficult and you should do this work yourself if necessary.” Of all
> things, QA should be given high priority to ensure good data.
>
> *
>
> Last but not least, this import should be registered in the import
> catalogue <https://wiki.openstreetmap.org/wiki/Import/Catalogue>as
> it is missing there right now.
>
>
> My honest opinion is that this import is not quite ready to be executed
> with the plan that is in place. The data is quite good and of decent
> quality but the process does not ensure keeping OSM without risking the
> data quality in the database. I'd appreciate hearing more thoughts from
> you and the mailing list members.
>
>
> Thanks and regards,
>
> *----*
> *Innocent,*
> Phone: *+255 714 166 665* (Call & WhatsApp).
>
>
> On Wed, Jun 2, 2021 at 9:08 PM Antidius Kawamala <antidius at dlab.or.tz
> <mailto:antidius at dlab.or.tz>> wrote:
>
> Hello community,
> The subject of this message is to inform the OSM community in Tanzania
> of an import prepared by Living lab initiative as part of a project
> to scale up the Open Street Mapping project,Missing Maps Initiative
> by combining data obtained from manual digitization from the latest
> satelite image 2019 In Tanga City.
>
> This import consists of more than 500 hundred thousand footprints of
> buildings located in all over the Tanga region.
>
> A wiki page with details of the proposed import is available
> here:https://wiki.openstreetmap.org/wiki/Tanga_Building_Footprints_Import
> <https://wiki.openstreetmap.org/wiki/Tanga_Building_Footprints_Import>
>
> Experienced OSM contributors who would be interested in participating in
> this import will be welcome.
>
> A similar message regarding this import will also be shared on the OSM
> mailing list,HOT and WhatsApp group for OSM Tanzania after posting
> to the wiki to gather a maximum feedback.
>
> Don't hesitate to share your comments, questions, or problems
> related to this import before it begins.
>
> Regards
>
> *Antidius Kawamala*
> *GIS Specialist and **Researcher (dLab)*
> *M: +255769806836*
> *Founder of **RootGIS <https://rootgis.wordpress.com/>*
> /*Skype: **Antidius Kawamala | **Twitter:**@Antidius36*/
> *P.O. Box 33335 Dar es Salaam, Tanzania | College of ICT, UDSM-
> Kijitonyama campus | **dLab <https://dlab.or.tz/>*
>
>
>
> *
> *
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