[HOT] unknown structures are buildings?

Pierre Béland pierzenh at yahoo.fr
Tue Nov 4 22:09:10 UTC 2014

Hi Blake

revisiting your page, it is already quite instructive bringing attention to various aspects. It is clear and easy to understand.

Even if not yet completed, we could link to this in the Task Manager to help beginners.


      De : Blake Girardot <bgirardot at gmail.com>
 À : Ray Kiddy <ray at ganymede.org> 
Cc : hot at openstreetmap.org 
 Envoyé le : Mardi 4 novembre 2014 16h39
 Objet : Re: [HOT] unknown structures are buildings?
Hi Ray,

I think the only reason my mapping tips page hasn't made it anywhere 
else is because I haven't finished it yet and I was sort of waiting 
until it got done and was given a final once over by everyone to make 
sure I am not pointing out anything incorrectly before sharing it widely 
as a resource. I have most of the data for the remaining sections so the 
rest should go pretty quickly.

I have been spending most of my time on validating and trying to help 
with a data import which is almost done and then I can finish up the 
tips page(s) and get them somewhere easier to find.


On 11/4/2014 4:27 PM, Ray Kiddy wrote:
> 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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