[HOT] Highway=residential in Africa

andy Gardner andygardnermail at yahoo.co.uk
Mon Jun 13 18:54:06 UTC 2016


Hello there, Should the limit for a road perhaps be the width of  a vehicle and under for a path? (A Land Rover's roughly 2m wide). There's a scale on JOSM and ID. Couldn't see one on Potlatch.
Andy 

    On Monday, 13 June 2016, 17:48, Chad Blevins <cblevins at usaid.gov> wrote:
 

 Hi John,

You're absolutely correct.  When Courtney and I created theMozambique Tracing Guide the original tasks were urban focused, and the scopehas changed to rural areas.  Currently agroup of interns are mapping those districts and I've had severalinquiries about road classifications.  Theguidance I’ve given is to tag all rural roads as unclassified unless they are clearlylabeled/numbered as a “major” road, or very small pathways.

The Africa roads wiki is great and was referenced whencreating the Mozambique guide.  Many road examples in this part of theworld are debatable as "unclassified", "tracks", or"paths".  It’s almostimpossible to know the use and in some cases classifications may change basedon time of year.  A subset of internscopied here (Forrest, Julia, and Alex) have agreed to review the Mozambique guidanceand suggest edits for the rural landscape.  This could be a good opportunity for them to reviewand comment on the Highway Tag Africa wiki as well.
More to come.
Thanks,Chad
On Mon, Jun 13, 2016 at 8:01 AM, john whelan <jwhelan0112 at gmail.com> wrote:

OSM has its roots in the UK and Germany, in the UK highways are classified A, B, I think even C and other very minor roads were labelled unclassified by Ordnance Survey historically so that is where the term comes from.  The UK Ordnance Survey was historically important in creating everyday maps.

By using a standardised set of tags for highways it makes the rendering systems life easier.  OSMand for example is used everywhere in the world and if it had to know about a different set of tags for each country the software would be much more complicated.  If you’re mapping in OSM of course there is nothing to stop you tagging highways in any manner you like.  The only problem is that the features will not be rendered by the normal systems.

If you’re mapping in a HOT project then you’re expected to follow the HOT guidelines for tagging.  ie building=yes etc.

The problem here is the instructions for a group of projects only contain a subset of the highway types used for mapping in Africa as defined by the African Highway Wiki and the examples shown are all urban areas so the instructions although correct are incomplete as the project covers both urban and rural areas.

Cheerio John ​



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Chad BlevinsGeoCenter
U.S. Global Development Lab USAID202-712-0464
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