[Talk-ug] Import of Buildings in Districts Bordering DRC
Bert -Araali- Van Opstal
bert.araali.afritastic at gmail.com
Tue Jul 14 06:55:23 UTC 2020
Thanks for the feedback Deogratias,
Appreciate a lot what you are doing and the approach. This seems a well
managed project in the pipeline. Keep on going !
One question, you state the Maxar imagery is again available in JOSM ? I
am running version 15553, about 1 year old, and it still doesn't load
Maxar. Do we need to update to most recent ? What version are you
running with Maxar available ?
On 14/07/2020 09:29, Deogratias Kiggudde wrote:
> Hello Bert,
> Thanks for your insightful feedback and comments about the process.
> 1. Regarding the offsets, you are right, the team will be updating
> that section of the process so that mappers rely both on the
> buildings and road features when making the offset to align features.
> 2. For the imagery, the team will be using a purchased updated maxar
> Imagery. Maxar imagery is now back on JOSM and ID editor
> (premium and standard). The imagery purchased covers the bordering
> districts in Uganda as well as DRC and is of a 2019 date. The
> import team will also be trained to use buildings under
> construction and other features to determine the most recent
> imagery. From our initial assessment, the imagery purchased is
> newer than inbuilt maxar and bing imageries and clearer than the
> Esri World Imagery.
> 3. Replacing geometry is definitely a tricky situation, the team
> plans to use the conflation tool mainly for the buildings be able
> to replace geometry and reduce on the number of deletions in the
> process. Through this process, the tags already existing on a
> building feature will be preserved and only new tags will be
> added. The import team will also be trained to be able to align
> prereferral features like gates and boundary walls but I do agree
> that will be a sticky situation that I will discuss with the team
> to see how we can navigate it smoothly
> 4. Yes, we are counterparts in DRC are in touch with the UN Mappers
> that are currently mapping in the areas of Ituri province. The
> discussions on ways how we could combine forces as well as share
> responsibilities are still ongoing but that's for highlighting
> this situation.
> Thanks again Bert for the good comments I will be discussing to my
> team to make some of the edits you sighted as well as acquire more
> concrete information on our collaboration with the UN mappers and
> revert to you with more information.
> *Humanitarian OpenStreetMap Team *Project Manager, Uganda Email:
> kigguddedeogratias at hotosm.org
> <mailto:kigguddedeogratias at hotosm.org>Skype: deogratius kiggudde
> Twitter: @KigguddeDUG Mobile: +256 703 143 225
> *Using OpenStreetMap for Humanitarian Response & Economic Development*
> web <http://hotosm.org/> | twitter
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> On Thu, Jul 9, 2020 at 10:08 PM Bert -Araali- Van Opstal
> <bert.araali.afritastic at gmail.com
> <mailto:bert.araali.afritastic at gmail.com>> wrote:
> Hello Deogratius,
> First of all, great project, really looking forward to get going.
> I went through both wiki pages, and overall very solid and
> detailed approach.
> I do have some concerns, points on which improvements could be made.
> 1) Offsets - in many previous HOT projects offsets were provided
> by the project manager, which are easy to store and implement in
> JOSM. Until November 2019 we could use the MAXAR imagery in JOSM
> (still blocked ? only Maxar imagery in ID), and I used it a lot.
> My experience was that it has significant offsets in comparison
> with other imagery layers, especially on hill sides you see a lot
> of distortion. This can even be seen in the offset of roofs in
> regard to the ground level. An important issue in correct
> alignment of the imagery.
> So when you state in the procedure that we should align the layers
> by looking at the buildings this will not be correct. On a tile
> by tile basis you should align with features on ground level, most
> convenient are roads.
> Another way could be we have GSM tracks or reference points from
> the field. The project manager could make offsets available for
> every tile using these field datasets or you could engage some
> people in the field to get them. Because even many of the
> existing buildings could be misaligned.
> 2) How to determine which data is the most recent. The Maxar
> imagery is dated. Other imagery layers on which existing buildings
> are mapped is mostly not. SO there is no clear reference of what
> is most recent. Comments and descriptions in changesets can
> provide some information, as many existing mapping is done based
> on field knowledge. So some improvement and more details could be
> provided in the procedure on how to determine which is the most
> recent and accurate data by referring and evaluating data in the
> Same applies to building relations when 3D mapping was done. You
> should provide some details there that in these cases only the
> building outline should be replaced and other building:parts
> should be updated. There are not many but some are there because
> I added them. This is a very complicated task.
> 3) Replacing building geometry. Will be a much more extensive
> exercise as described. Many areas are far more detailed then just
> the buildings. As you probably know many have the plots aligned
> with landuse tags, other features as fences and gates are present
> at many locations. If you replace the geometry with the new
> buildings all these "attached" features, some even sharing nodes
> with the building, must be updated. I have no experience with
> geometry replacement so how will this work ? If a misalignment is
> seen all the features need to be aligned as a group.
> 4) Currently there are two UN mapping teams doing a lot of work in
> these areas, in support of MONUSCO troops. One focuses on roads
> and buildings, the other team on landuse. How do we avoid
> conflicts with those projects or get them involved ? They
> contacted me several times so they are open for cooperation.
> Greetings and success with the project.
> Bert Araali
> On 02/07/2020 17:46, Deogratias Kiggudde wrote:
>> Hello community,The subject of this message is to inform the OSM
>> community in Uganda of an import prepared by HOT  as part of a
>> project to scale up the Missing Maps initiative, combining data
>> extracted in a way automated and information collected in the
>> field .In the Uganda , this import consists of more than 2
>> million footprints of buildings located in the districts of
>> Kisoro, Kanungu, Rubirizi, Kasese, Bundibugyo, Ntoroko, Bulisa
>> Hoima, Kikuube, Nebbi, Zombo, Arua, Koboko, Maracha, Kiryandongo,
>> Kamwenge, Kyegegwa and Insigiro. This data was extracted from
>> high-resolution imagery provided by Maxar over the period 2015 to
>> A wiki page with details of the proposed import is available here:
>> https://wiki.openstreetmap.org/wiki/FR:Import_B%C3%A2timents_Maxar-Ecopia_Est_RDC_%26_Ouest_Uganda <https://wiki.openstreetmap.org/wiki/FR:Import_B%C3%A2timents_Maxar-Ecopia_Est_RDC_%26_Ouest_Ouganda>
>> A second page contains the practical details of the proposed
>> methodologyto perform this import:
>> https://wiki.openstreetmap.org/wiki/FR:Import_B%C3%A2timents_Maxar-Ecopia_Est_RDC_%26_Ouest_Ouganda/D%C3%A9roulez <https://wiki.openstreetmap.org/wiki/FR:Import_B%C3%A2timents_Maxar-Ecopia_Est_RDC_%26_Ouest_Ouganda/D%C3%A9roulement>
>> Experienced OSM contributors who would be interested in
>> participating inthis import will be welcome.
>> A similar message regarding this import will also be shared on
>> the OSM mailing list of DRC and the HOT mailing list to gather a
>> Don't hesitate to share your comments, questions, or
>> problemsrelated to this import before it begins.
>>  https://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Team
>> *Humanitarian OpenStreetMap Team *Project Manager, Uganda Email:
>> kigguddedeogratias at hotosm.org
>> <mailto:kigguddedeogratias at hotosm.org>Skype: deogratius kiggudde
>> Twitter: @KigguddeDUG Mobile: +256 703 143 225
>> *Using OpenStreetMap for Humanitarian Response & Economic
>> web <http://hotosm.org/> | twitter
>> <https://twitter.com/hotosm> | facebook
>> <https://www.facebook.com/hotosm> | donate
>> Talk-ug mailing list
>> Talk-ug at openstreetmap.org <mailto:Talk-ug at openstreetmap.org>
Ing. Bert Van Opstal Mobile: +256 782 304106 Email:
bert.araali.afritastic at gmail.com
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