[HOT] unknown structures are buildings?

thatwoodb at hushmail.com thatwoodb at hushmail.com
Tue Nov 4 18:25:33 UTC 2014


I agree wholeheartedly with Ray. It would be very helpful to have a
page of examples of W. Africa satellite imagery showing, 1) buildings
that are often overlooked by mappers, especially the less experienced
ones, because they may not look like buildings to the uninitiated,
and; 2) things that are often mistaken for buildings, but aren't. This
catalog could be even more useful if further broken down by
areas/countries whose structures differ somewhat, as well as by
typical rural vs urban structures.
If s/he has neither visited these countries nor studied their
cultures, a mapper's working at a distinct disadvantage without such
examples. I've spent some time looking at photos online of traditional
buildings in this part of the world to try to improve my mapping, but
these shots are taken from ground level, of course. And as Ray points
out, it's a completely different experience when viewing them from a
satellite's POV.
-Ian 

On 11/4/2014 at 3:03 AM, "Ray Kiddy"  wrote:On Tue, 4 Nov 2014
09:51:54 +0100
Claire Halleux  wrote:

> Hi Ray,
> 
> For cassava, you could add something on the following page I guess:
> https://wiki.openstreetmap.org/w/index.php?title=Tag:crop%3Dcassava
> 
> If you intend to use a screenshot of imagery, make sure you keep the
> copyright visible. We got permissions to do so from MapBox, HIU and
> Bing, for training purposes.
> 
> Cheers
> 
> Claire
> 

I am not explaining myself well. The page you are pointing to has a
picture of casava taken from the ground. This does not help me
identify
anything if I am looking at casava in a photo taken from a satellite.

How does one recognize a mound of casava in Liberia? Or a yurt in
Mongolia? Or a well in Pakinstan? From satellite imagery? Does a well
in
Pakistan look like well in Montana? Probably not. So, when one has no
experience with an area of the world, how can one identify its
structures? One way is to look at a bunch of satellite imagery and
keep
asking questions, over and over. Or, perhaps pictures of differently
shaped structures can be pulled out which identifies different
structures and describes where they appear. Like a catalog.

So, is there some catalog of satellite imagery that will show what
things look like in various places, for training purposes? Or would
there be suggestions on how to create one and where it could be?

thanx - ray

> 
> On Tue, Nov 4, 2014 at 2:58 AM, Ray Kiddy  wrote:
> 
> > On Tue, 4 Nov 2014 09:16:50 +0800
> > maning sambale  wrote:
> >
> > > To me, it looks like building=construction (the dividing walls
are
> > > visible).  Nearly the same as what I've seen on the ground in
> > > Malawi, Africa.
> > > If you're unsure, just tag it as building=yes.
> >
> > Is there a place on a wiki to place pictures that can be examined
to
> > learn to recognize some of the local structures? A catalog that
> > shows how different things appear in different places?
> >
> > I have had similar questions. I had a pic and the round honeycomb
> > looking things were identified as casava plants growing in bunches
> > in Liberia. Is there a logical place on one of the wikis, a sort
of
> > image catalog, where I could add this pic and mark it with "Casava
> > plant, Liberia, resolution of image = x"?
> >
> > I was editing in "#479 Tharparkar Drought, Sindh, Pakistan", and
> > some of this stuff could have been on the moon. I just have no
> > context to figure out the shapes of houses, what wells look like
> > (just like houses?) and so on.
> >
> > A catalog of the structure types one might find in, for example,
the
> > deserts of Pakistan might be helpful.
> >
> > We could me mapping in Mongolia and I am also not going to know
> > what a yurt looks like from above. Same thing.
> >
> > I went to the wiki and did a search, for example, on Pakistan and
> > got back, as you might expect, the page on Pakistan. This page
does
> > not show me, however, how the different types of houses there may
> > appear in imagery.
> >
> > I can, of course, start something, and will. I just wanted to see
if
> > there are suggestions from you all first.
> >
> > thanx - ray
> >
> >
> > > On Tue, Nov 4, 2014 at 8:41 AM, Warren Roberts
> > >  wrote:
> > >
> > > >
> > > > Does anyone have an idea if these are walls for building
> > > > (without roof) .. there are many and in Sierra Leone.  Wanted
> > > > to identify them ether to digitize them as buildings.  Thanks
> > > >
> > > > [image: --]
> > > >
> > > > Warren Roberts
> >
> > _______________________________________________
> > HOT mailing list
> > HOT at openstreetmap.org
> > https://lists.openstreetmap.org/listinfo/hot
> >
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