[HOT] Houses or buildings with no roof in W Africa mapping

Blake Girardot bgirardot at gmail.com
Sat Sep 13 17:00:39 UTC 2014

I agree with the idea of organizing some tagging conventions is 
important so our W. Africa mapping is consistent. And that conventions 
will vary by region.

There really are not that many tags we use for 80-90% of what we map so 
we should be able to get them pretty consistent.

I also agree that we should keep it simple so we can communicate it 
easily to mappers and make helpful progress as quickly as is reasonable.

In this particular instance I'd like to use building=yes, 
building=construction, or building=no_roof

I am not comfortable using wall for what is not really a barrier wall in 
the spirit of the barrier=wall tag. I don't think it is very intuitive 
for people on the ground to see a barrier=wall indication on a map, but 
only a partial house there.

Thank everyone for their replies so far and I have forwarded this thread 
to supersonic3974 so he can follow it and I really appreciate him asking 
a question that has been on my mind and I am sure lots of others.

Best wishes,

On 9/13/2014 12:38 PM, AYTOUN RALPH wrote:
> I have been putting these buildings in as building=construction but they
> can also be simply building=no_roof or barrier=wall to indicate that
> there is a structure there to help the people on the ground identify
> where they are and indicate that there is something there.
> It is not possible for mapping from photos to be able to interpret or
> identify an abandoned building as to one under construction, just as it
> is not possible to identify which round structure is a residence or a
> grain store.
> If we approach the HOT mapping with the purpose of producing a basic map
> for people on the ground to achieve their task then trying to take it
> further and making it more complex will slow down the process and also
> add the element of uncertainty of what an item actually is and therefore
> lose confidence.
> As long as we indicate there is a structure there, then people on the
> ground can investigate if they need to. I believe that knowing there is
> something there is better than no knowledge at all.
> I would agree with showing it as barrier=wall so that it is visually
> different to that of a building and will indicate that we do believe
> that at the time of the imagery it was not occupied. I would apply this
> to a round structure without a roof as well.
> Either way we need to settle some of these tags so that we are all
> giving the same instructions and those trying to use our HOT mapping
> will be able to have some consistency in the output.
> We need to bear in mind that what we apply to our mapping in West Africa
> may not be compared to what applies in Haiti as the culture and living
> conditions vary considerably.
> Hence the existence of the Africa Highways guide. Keeping it simple
> provided it meets the requirements of the task in the field.
> Because we are continuously inviting new mappers into the HOT emergency
> mapping circle through the Task Manager the ideal would be something
> like Blake Girardot's "Satellite imagery interpretation examples" and
> "Africa Highways" in the instructions for these jobs and applicable to
> that specific part of the world. Again this is complicated by the
> variations in structures between urban and rural areas.
> Hope this helps
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