OpenStreetMap

Tracing guide for Aweil, South Sudan

Posted by JanBohmMSF on 13 December 2016 in English (English)

This is a tracing guide for people mapping Aweil in South Sudan for MSF with Missing maps (see tasks here). Aweil is the capital city of the state of Northern Bahr el Ghazal. The city's infrastructure is relatively developed. Aweil now has a functioning railway station, hotel, airport, soccer stadium, and public hospital. [1]

As we are mapping the suburbs of Aweil, you will see rather sparse settlement. Here are some photos of the structures that are visible on the satellite imagery. Very detailed information on what MSF is doing in this area, along with many useful photos (some published in this tracing guide) can be found here: One Day in Aweil: An MSF Team Portrait

Residential areas

Residential area is an area with more than two buildings. Whenever you draw one or two buildings, do not draw residential area around it. Sometimes, it makes sense to draw one huge residential area instead plenty of small ones. Please, do zoom out and consider the right size of the residential area you are mapping. Here is an example of an area, where drawing one bigger residential area is a better decision. However, it is sometimes difficult to apply a global rule and you need to use your own judgement and expereince. If you are not sure, leave a comment with a link to your task in the comments and let me help you. Big residential area in idEditor (If you do not see the image, see it here)

Buildings

The houses you are looking for look like this from the ground

Aweil huts -areial image [2]

Another photo of Aweil from above

Areial photo of Aweil [3]

And the last one

Areial photo of Aweil [4]

Buldings

Houses in this area are usually either traditional African tukuls - round (or square) structures with thatch roof or more solid square buildings with roof from metal.

Tukuls

Tukul image [3]

Other buildings

Aweil building image [3]

How does it look like in the aerial images?

See the huge square building on west of the residential area, and few tukuls (rounded or semi-rounded). South from a tukul in the north-east part of the area, there is a yard - you can see, that unlike buildings, the yard not drop a shadow. As the task is to map residential areas and buildings, there is no need to map the yard. Tukuls and other buildings

If you need any help, feel free to leave a comment here and post a screenshot of the area that you are mapping.

[1] https://en.wikipedia.org/wiki/Aweil,_South_Sudan

[2] https://upload.wikimedia.org/wikipedia/commons/d/de/Sudan_Aweil_huts_2006.jpg

[3] https://medium.com/msf-alert/one-day-in-aweil-an-msf-team-portrait-bb0fa1f95755#.q67969co7

[4] http://aweebitmore.blogspot.cz/2013/06/aweil-south-sudan.html

Comment from mustafakamil on 14 December 2016 at 12:44

قطار اويل المسافة طويل

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Comment from Harry Wood Imports on 18 December 2016 at 13:50

Those "Tukuls" are amazing. Wish my roof looked like that! ...well it might look at bit out of place in London :-)

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Comment from Nielkrokodil on 15 January 2017 at 10:34

Hi!

I'm not sure what to do with roads. Are they being mapped in part 3? I mapped some major roads (highway=unclassified), other mappers mapped some highway=track. As roads are not mentioned in the task I stopped mapping them to be faster with the buildings and residential areas.

ps: Congratulations to your tracing guide. It realy helped me a lot!

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Comment from JanBohmMSF on 15 January 2017 at 18:59

@Nielkrokodil Hi, the concept is same as in other Missing maps tasks: the most important is to map what the task is asking for (residential areas & building in this case), because that is what we need first of all. A wonderful thing about editing OSM is that the map can be used in many different ways by anyone, who needs it. So there can be someone, who would appreciate roads being mapped in the future. So technically, it is not wrong to map roads. But as we are under time pressure, please focus on buildings first, there are still a lot of unmapped squares in the priority area. Happy that the tracing guide helped. Jan

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Comment from ErickF on 17 January 2017 at 00:22

Hi Jan,

The HOT Task Manager page (http://tasks.hotosm.org/project/2398) says to outline Residential Areas only where there are more than two buildings, but I see some parts of the completed map have Residential Areas outlined around 1 or 2 buildings. Can you maybe add a comment to this page clarifying that 1 or 2 buildings together should not have a Residential Area drawn around them? Just trying to be consistent with the Task page. Thank you!

Erick

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Comment from JanBohmMSF on 17 January 2017 at 14:29

@ErickF Hi Erick, thanks for the good point. I have updated the tracing guide by adding a paragraph about residential areas:

Residential area is an area with more than two buildings. Whenever you draw one or two buildings, do not draw residential area around it. Sometimes, it makes sense to draw one huge residential area instead plenty of small ones. Please, do zoom out and consider the right size of the residential area you are mapping. Here is an example of an area, where drawing one bigger residential area is a better decision.

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Comment from roosjes on 17 January 2017 at 22:12

Hi Jan, thanks for clarifying that, but could you also maybe add a picture of how it could/ should be done? this combo still leaves some room for misunderstanding
and it will save people a lot of time ;)

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Comment from SamSunnyCT on 23 January 2017 at 04:15

Like Erick I believe I need the same clarification. Are we meant to map the buildings within the residential areas that we are identifying, or only the residential areas (plus single buildings in groups of two or less)? Thank you.

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Comment from JanBohmMSF on 23 January 2017 at 11:07

@SamSunnyCT @roosjes: Send me the link to a task, where you are not sure.

And you are supposed to map buildings as well as residential areas, i. e. areas inside that are buildings.

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Comment from SamSunnyCT on 23 January 2017 at 11:21

Thank you for the clarification @JanBohmMSF. In hindsight I'm not sure why that was unclear to me. It was my first OSM mapping session and I was figuring it out. I believe that I have corrected all my work and look forward to contributing more and hope to be doing it accurately. I hope that it is helpful.

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Comment from JanBohmMSF on 23 January 2017 at 11:31

@SamSunnyCT happy to help you. And thanks for your effort. Our teams in South Sudan are looking forward to work with the maps, so your help is really appreciated.

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Comment from AmitaJacob on 7 February 2017 at 19:23

hi i have just started to map the tukuls do i need to map them as points or if i see two or more map them as smaller areas instead ?

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Comment from Thom Starnes on 7 February 2017 at 20:15

Automate residential area boundaries?

Would it not make sense to first digitise all of the buildings, and then apply a convex hull algorithm i.e. 'join the dots with a 100 metre buffer'? This would reduce the work load and ensure a more consistent approach to mapping residential areas.

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Comment from JanBohmMSF on 8 February 2017 at 08:25

@AmitaJacob: Please, map the tukuls as areas, not points. Tukuls (as well as any other buildings) are supposed to be mapped as area and categorized as building.

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Comment from SoleneV on 19 February 2017 at 00:31

Hi, there seems to be two contradictory instructions regarding mapping the residential areas: - on the instruction page we are asked to map the whole compound, paying attention to fences. ("Please outline residential areas (more than two buildings / structures) and tag as landuse=residential (in JOSM) or Landuse Features=Residential Areas (in iD). Try to trace around all of the compounds, not just the houses; the compounds often extend well past the inner circle of houses but are definitely part of the village. You should be able to see compounds as they usually have a fence around them.") - in the posts above, drawings show residential areas outlines kept quite close to groups of buildings, not to the fence lines at all which, in rural areas, can be quite distant. Mappers have been using both methods... Could you clarify? Thank you.

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Comment from ArneKimmig on 22 February 2017 at 19:04

Hello, I got the same question as SoleneV. When I started mapping some weeks ago I was very cautious and drew small residential areas. But watching the work of others I decided for myself to draw the compounds bigger and more following the fences and natural borders. For me that looks much closer to reality and till further notice I will trace 'big' compounds. Best Arne

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Comment from Gregor_D on 26 February 2017 at 15:34

Hello, I was wondering if corrals are also to be mapped. Around some tukuls it looks like if there were corrals for cattle. Are they to be mapped as buildings or to be omited? Best

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Comment from JanBohmMSF on 27 February 2017 at 08:48

@Gregor_D Hi Gregor, there is no need to map corrals, so you can ignore them. Thanks for you effort!

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