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,
Blake
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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