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

[Bjoern Hassler]

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/?s
> ort_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*
> *Using OpenStreetMap for Humanitarian Response & Economic Development*
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