[HOT] Experienced road network mappers - Salima District, Malawi

Mon May 22 03:49:42 UTC 2017

Hey Bjoern,

Thanks very much for your suggestions, will update the task, and as you say
a collated page with photo examples would be awesome.

Thanks very much for the contributions and validations so far!

http://tasks.hotosm.org/?sort_by=priority&direction=
asc&search=Salima+District

Rebecca

On Sat, May 20, 2017 at 2:00 PM, john whelan <jwhelan0112 at gmail.com> wrote:

> The problem with using imagery is it depends when it was taken.  Just
> after the rainy season all the unpaved highways will be narrower.
> Realistically if we map the highways connecting settlements as something
> such as highway=unclassified surface unpaved then let the locals clean up
> that probably is the best.
>
> Cheerio John
>
> On 20 May 2017 at 07:38, Bjoern Hassler <bjohas+mw at gmail.com> wrote:
>
>> Hi Rebecca,
>>
>> Thanks for posting this!
>>
>> A few suggestions below - let me say up front that I am really happy to
>> work on these together with others - but I think it does need a steer from
>> others as well, maybe some experienced validators? Here goes.
>>
>> I'm aware of https://wiki.openstreetmap.org/wiki/Highway_Tag_Africa (and
>> pictures at street level), but it would be really helpful to have some
>> actual satellite images with the typology overlaid as well. E.g.
>>
>>    - an image of a section with "highway=tertiary". Comment: You can see
>>    the paved road surface, it's a wide road - definitely tertiary. Most likely
>>    these should all be marked already.
>>    - an image of a section with "highway=tertiary". Comment: You can see
>>    it's unpaved, but it's quite wide (two vehicles can pass), and connects
>>    several major settlements - still use tertiary
>>    - an image of a section with "highway=unclassified". Comment: You can
>>    see it's unpaved, and looks quite narrow (two vehicles cannot pass easily),
>>    but it's usable by 4x4. Use unclassified.
>>    - an image of a section with "highway=unclassified". Comment: You can
>>    see it's unpaved, and looks quite narrow, but it's usable by 4x4. Although
>>    it only goes to one settlement, use unclassified.
>>    - an image of a section with "highway=residential". Comment: Short
>>    roads between buildings.
>>
>> Other comments that would be useful (if they can be made):
>>
>>    - If you are not sure what to use: Use unclassfied over residential
>>    (or other way round).
>>    - Use path over track (etc).
>>    - (http://www.openstreetmap.org/user/Johnwhelan's suggestion) If you
>>    can see a road going to a house with metal roof, that road is most likely
>>    passable by vehicle: use unclassified, rather than track/path.
>>
>> MapCSS:
>>
>>    - highway=residential and unclassified look the same in JOSM. Would
>>    be good to have an adjusted MapCSS (Africa.css) that distinguishes those,
>>    and (ultimately) gives more prominence to the features we are interested in.
>>
>> Final suggestion: Wiki page https://wiki.openstreetmap.org
>> /wiki/Building_Tag_Africa. I saw a presentation somewhere (Ralph?) with
>> images of buildings (round huts, square houses). It would be good to set up
>> a new wiki page with those, to help in mapping buildings.
>>
>> As I said above, I'm very happy to help with all of these. E.g. if some
>> of the validators would be happy to pass images to me (maybe as they are
>> validating and re-tagging or extending road networks), which I would be
>> very happy to collate, post to the wiki, and write text. Or start putting a
>> MapCSS together and check it into git, etc...
>>
>> Any takers?
>> Bjoern
>>
>> PS. Somewhat unrelated to the above: Unclassfied->tertiary: This may be a
>> hard call to make, but some of the long fairly straight roads, clearly
>> connecting larger villages (e.g. North of the M14 in this task) are down as
>> Unclassified (in pre-existing map data). It seems to me that some of them
>> should become tertiary. Johnwhelan also mooted this in a validation comment!
>>
>>
>> On 19 May 2017 at 17:37, Rebecca Firth <rebecca.firth at hotosm.org> wrote:
>>
>>> Hi All,
>>>
>>> We have set up two small projects to map the road network in Salima
>>> District, Malawi, to support UNICEF projects working on the ground. UNICEF
>>> are finding it difficult to work in the region without an accurate road
>>> network map, as navigation and deliveries for all their projects is
>>> continually delayed causing unexpected changes to project timelines and
>>> costs.
>>>
>>> The projects are around half way done, but would really benefit from a
>>> couple of experienced road mappers jumping on to map + validate the data.
>>> The tasks are here, if anyone wants to jump on:
>>> http://tasks.hotosm.org/?sort_by=priority&direction=asc&
>>> search=Salima+District
>>>
>>> Have a lovely weekend,
>>>
>>> Rebecca
>>>
>>> --
>>> *Rebecca Firth*
>>> Community Partnerships Manager
>>> rebecca.firth at hotosm.org <tyler.radford at hotosm.org>
>>> @RebeccaFirthy
>>> Skype: rebeccafirth
>>>
>>> *Humanitarian OpenStreetMap Team*
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>>
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>

-- 
*Rebecca Firth*
Community Partnerships Manager
rebecca.firth at hotosm.org <tyler.radford at hotosm.org>
@RebeccaFirthy
Skype: rebeccafirth

*Humanitarian OpenStreetMap Team*
*Using OpenStreetMap for Humanitarian Response & Economic Development*
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