Fwd: [OSM-talk] Mapping Klong Toey Slums

[Liz Barry]

---------- Forwarded message ----------
From: "Mishari Muqbil" <mis...@mishari.net>
Date: Jul 14, 2016 7:01 AM
Subject: [OSM-talk] Mapping Klong Toey Slums
To: <ta...@openstreetmap.org>
Cc: "Klaikong Vaidhayakarn" <klai...@gmail.com>, "Garavig Tanaksaranond" <Gara...@chula.ac.th>

Hello,

I just wanted to feedback from the community for our effort to map the slums in Klong Toey, Bangkok. The size of the area is about 1km x 2 km around here and I have captured a sequence on Mapillay here. There are several challenges here including access to internet and English literacy, so I have come up with the following rough plan.

1. Put out a call for volunteers, work with NGOs in the area to find local kids who are interested in putting their community on the map.
2. Train the kids in using ID editor. I think I will limit them to doing specific things i.e. walkways, houses, trees, restaurant, convenience stores with individual kids limited to 2-3 features to avoid confusion then as they get the hang of it, increase their repertoire.
3. Take over a local internet cafe for a day for training and mapping purpose.

Now I'm not sure about the rest of the process, you can see from Mapillary that due to the somewhat dense nature of the community, GPS is inaccurate and neither Bing nor Mapbox has enough of a resolution to be meaningful. So I have several (possibly overlapping) ideas.

a) hire or borrow a drone to take aerial imagery and upload to openaerialmap and use that as a basemap but I'm not sure how possible it will be to see through the roofs.
b) get a team of surveyor students from Prof. Garavig to map out the paths in the community (it's pretty big so I'm not sure how tine consuming it is) then have the community kids fill in the blank.
c) use walking papers and have the kids go out, sketching what they see from the rooftop but I feel this may be prone to errors.

Does anyone have any experience or tips they can share on how we can achieve this?

Best regards
Mishari

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[Liz Barry]

Hi everyone, 

It is inspiring to hear of these projects in Bangkok and Cartagena! <3

Depending on the wind and when the rainy season is about to start in Bangkok, putting a kite up in the air with a small camera could be the fastest and most community-engaged / hands-on / accessible / repeatable way to get aerial imagery: http://www.bangkokpost.com/learning/learning-news/524907/the-kite-flying-season-in-bangkok

Once you have an aerial photo (by balloon/kite/drone/reaaaaally long bamboo pole:), you can place (georeference) it in http://mapknitter.org/, then it's one click to loading that base imagery in any/all of OSM's editors for tracing over. 

I copied the grassroots mapping list where there are people to chat with about DIY aerial imagery for mapping. 

Yours, 

Liz

--

+1 336-269-1539

@lizbarry

On Thu, Jul 14, 2016 at 6:23 PM, hya...@gmail.com <hya...@gmail.com> wrote:

Hi Mishari,

I can share from the experience to mapping slums in Cartagena, Colombia with a Latinamerican NGO called TECHO (is not an acronym), plus the last steps that you list (a, b, c) we started mapping the past using Bing imagery (normally have imagery date); then a small aerial filming company donate drone flights to map the present.  After that we count double of houses that community leader beleive that exists; but using filedpapers on the field we get exact number of houses an his conditions (like presence of tilts to deal with floods).

Pictures from mobiles apps and ballons just serve as helpers, but maybe could be some security issues, so we prefer to use papers, all the steps always include community members.

This actually is a methodology for mapping slums in connection of every house as spatial element with household surveys that give us a clear picture of community dimensions, so useful for his inner development.

I'm glad to say that now this slum is on the way to became a formal neighborhood and OSM map is the base to achieve that, so mapping slums can be a tool for poverty overcome, because as a formal one, they can be part of local administration planning services and budget, and of course, with all this information (that became in knowledge throught action) they know how to proceed in his development path.

I humbly hope this could help with your question; if not feel free to come with more,

Humberto Yances

 

[hya...@gmail.com]

Yes, ballons and kites is a good community-engaged method; in my particular case we face problems with the public-lab-ballon-kit because irregular power poles/wires at a low height, plus some wind present during the activity, so it wasn't possible (and a little insecure).  Regarding stiching it was not so easy to deal with 89 pictures using the MapKnitter (version 1 1/2 years ago), so by the moment aerial orthophotomosaics software seems to be the option. Another point regarding ballons is the cost of the helium.

About security (and mobile apps) you should consider to create a previous relationship with the community, so start with workshops or other activities.  In my particualr case for the replication in other slums in Colombia, the conclution to my proposal was "not recommended".  If your focus is catastral, ultra-high-res aerial imagery is the better way, mobile apps can create ancyllary pictures, very useful indeed.