[HOT] unknown structures are buildings?

Ray Kiddy ray at ganymede.org
Tue Nov 4 21:27:08 UTC 2014


On Tue, 04 Nov 2014 20:59:57 +0000
Michel Gilbert <michcasa at gmail.com> wrote:

> 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

It seems an obvious suggestion that a link to the page above could
appear on the page which some of the Instructions are linking to:

https://wiki.openstreetmap.org/wiki/2014_West_Africa_Ebola_Response

Obviously BGirardot's brain is not automatically hooked to all the wiki
pages it should be hooked up with, more's the pity. :-)

And this whole discussion could tie into the thread on the list:

  "Video that Best Represents Our Work?"

This thread seems to end up discussing ways to use video to help teach
mappers how to do better mapping.

This may be a good time for a straw-man catalog/training tool to appear
on the wiki.

- ray


> 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
> > > >




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