[HOT] Mapping in Dhaka, Bangladesh!

Blake Girardot bgirardot at gmail.com
Thu Jan 15 19:04:57 UTC 2015

Hi Jorieke,

I noticed a few buildings already mapped, like the ones in your 
powerpoint slide showing "significant" buildings, often with brightly 
colored roofs (blue, red, etc).

And they had roof:colour=* tags on them already in OSM.

Do you think those would help? It might help people find the buildings, 
or identify which building is mapped: "Oh the one with the red roof"

But I do not know if the roof:colour=* information would be available to 
the people using our mapping data.

Just wonder if you thought it would be a good idea or not. It is a small 
thing, but I liked the idea when I saw it.


On 1/15/2015 7:52 PM, Jorieke Vyncke wrote:
> Hi everybody,
> First of all thanks a lot for mapping in the Bangladesh tasks! It will
> be of great help!
> And indeed, I should have made it clearer in the presentation. I'll try
> to do a review tomorrow.
> In big follow the instructions of althio:
> for appartment and other large buildings --> * building=yes*
> for big individual trees which serve as landmark  --> *natural=tree*
> but also bushes and a bunch of trees together which too serve as
> landmarks --> *natural=wood*
> for open areas it is okay to map --> *leisure=common* /(but you can use
> also a landcover <http://wiki.openstreetmap.org/wiki/Landcover>tag for
> open areas like -->  natural=sand    or     landuse=grass)/
> Further remarks and clarification:
> - on buildings; indeed it would be good to collect the levels but don't
> put effort in it for now. We first need the base map of roads and big
> landmarks. This is essential to do mapping on the ground.
> - In this case building=construction is also not recommended. Every day
> things are changing here. Besides this, buildings under construction
> have often already inhabitants. Often they are just building one more
> floor on top of the existing building. (Think back to the catastrophe in
> Rana Plaza <http://en.wikipedia.org/wiki/2013_Savar_building_collapse>,
> you get buildings ready to collapes anytime by building like this...) So
> just stick with building=yes for now.
> - the leisure=common tag we try to adjust this one during the mapping on
> the ground
> If you need more clarifications, if you have questions or if you have
> ideas to make all this even more smoothly, please give us a sign!
> Best greetings,
> Jorieke
> 2015-01-15 16:48 GMT+06:00 althio althio <althio.forum at gmail.com
> <mailto:althio.forum at gmail.com>>:
>     Hi Bouke Pieter,
>     I will try to answer and Jorieke may refine later on.
>     > For high (appartment)buildings I assume building=yes?
>     OK.
>      >From the instructions tab: map landmarks, large buildings, not
>     small ones
>     [tags]
>     building=yes for rectangular & round buildings - trace the building
>     outline
>     building=construction for walls without a roof
>     [note: I assume more refinement are possible as in
>     building=residential or building=apartments but this is hard to tell
>     from imagery and not requested in this project]
>     [note 2: To Jorieke; maybe request additional tag for large buildings
>     otherwise they will not stand out if small buildings are ever traced.
>     Maybe height=* or building:levels=* even if it is approximate. Anyway
>     I think this is valid for any mapping: building=yes/residential +
>     building:levels=6..8..10..12 + source:building:levels=estimate from
>     imagery]
>     [note 3: sometimes in other project, building=construction is not
>     encouraged because construction seen in imagery may well be finished
>     by now. So follow instructions project by project]
>      > Trees: natural=tree?
>     OK.
>     from the powerpoint: map BIG trees (because they are landmarks,
>     significant tree)
>     [tags]
>     natural=tree [I assume]
>     > But how to do an open area? area=yes?
>     No.
>     from the powerpoint: map open spaces
>     [tags]
>     leisure=common [I assume, as usual practice for HOT]
>     Cheers
>     althio
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