In Madagascar, there is also a governmental road classification.
http://wiki.openstreetmap.org/wiki/FR:WikiProject_Madagascar#Hi.C3.A9rarchisation
http://www.lalana.org/documents/reglementations/routes/decret_99_976%20RN.pdf
National Roads are divided in three groups:
- primary : joining provincial prefecture
- secondary
- tertiary and/or temporary (maintained by regional authorities)
General recommendations for OSM are :
- more secondary than primary
- more tertiary than secondary
- unclassified+residential : more than 50% of the roads
At this point, in Africa, you face a first problem: where is the limit
between roads and tracks?
From malagasy government :
- primary : 2560 km
- secondary : 4630 km
- tertiary : 4550 km
Total including regional and local.. roads : 38 000 km.
My first idea was to use the governmental classification. But the ratio
between secondary and tertiary was not good. So my suggestion is to add
the roads going to the main village of each "commune" from the national
network. I don't have any idea on how much the length is. But with 5000
km, this would fulfill all the conditions mentioned above.
All of this don't tell where are the roads. So, I spent a lot of time
crowdsourcing to find the locations of the roads. With Bing and the help
of several contributors, it was possible to draw must of them.
Now, back to RDC.
Routes Nationales (19 605,73 km soit 35,5% du RRIG)
Routes Prov. prioritaires (19 715,18 km soit 35,7% du RRIG)
Routes Prov. secondaires (15 918,28 km soit 28,8 % du RRIG)
The first idea would be to use them as primary, secondary and tertiary
respectively. But the ratios are not good. Are national roads really
better than provincial ones? Are some national roads more important? The
ones part of "Corridors Régionaux"? Any data or local knowledges are
welcome.
Éric
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