[HOT] unknown structures are buildings?

Michel Gilbert michcasa at gmail.com
Tue Nov 4 20:59:57 UTC 2014


Hi Ian,

I found this page:
http://wiki.openstreetmap.org/wiki/User:Bgirardot/West_African_HOT_Mapping_Tips
that is created by BGirardot that provides good tips helping to understand
the context for mapping West Africa in terms of features.

As an uninitiated HOT mappers I would need more of these.

Michel

On Tue Nov 04 2014 at 1:27:33 PM <thatwoodb at hushmail.com> wrote:

>
>
>
> 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" <ray at ganymede.org> wrote:
>
> On Tue, 4 Nov 2014 09:51:54 +0100
> Claire Halleux <claire.halleux at hotosm.org> 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 <ray at ganymede.org> wrote:
> >
> > > On Tue, 4 Nov 2014 09:16:50 +0800
> > > maning sambale <emmanuel.sambale at gmail.com> 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
> > > > <gisteacher at gmail.com> 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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