Talk:Congo-Kinshasa

RGC

Here an overview of the datasets available at RGC, an assessment of the quality, and the status:

Dataset	Type	Origin	Quality	Status	Notes
Route	vector	GPS	good	done
		Ancienne base	questionable	not advisable
		Numerisation	verification required		sometimes useful with satellite images
		Teledetection	verification requires		sometimes idential to exisiting data from Africover import
Pont	point	GPS, Numerisation, Teledetection	?		useful?
Bac	point	GPS, Numerisation, Ancienne base	?
Aeroport	point	GPS	good	done
		Ancienne cartes	questionable	not advisable
		Numerisation	?
Gare	point	Ancienne base	?
Voie ferree	vector	Ancienne base	?		already present?
Hydro lineaire	vector	Image satellite	good	done
		Ancienne cartes	questionable	not advisable
		Numerisation	?
Lac	polygon	Image satellite, Ancienne base	?	already present
Port	point	GPS, Ancienne base	?		Useful?
Hydro surfacique	polygon	Image satellite, Ancienne cartes	?		partly already present
Axe navigable	vector	Image satellite, Ancienne base	?		would need to translate into boat tag
Cascade	point	Ancienne base	questionable	not advisable	not all points are on rivers
Localite	point	GPS	good	mostly done
		Image satellite	good	done
		Ancienne base	questionable	not advisable
		Numerisation	?
		Numerisation Atlas	?
Groupment	point	GPS, Ancienne base, Image satellite, Numerisation	?		Useful?
Collectivite	polygon	Image satellite, Numerisation Saint Moulin	?
Territoire	polygon	Image satellite, Numerisation Saint Moulin	?
District	polygon	Image satellite, Numerisation Saint Moulin	?	already present	RGC data show more detail
Province	polygon	Image satellite, Numerisation Saint Moulin	?	already present	RGC data show more detail
Frontiere	polygon	unknown	?	already present
Parc	polygon	GPS	OK	done
Parc	polygon	Ancienne base	?	partly
Ecole	point	GPS	OK	done
Ecole	point	Numerisation	?
Point eau	point	GPS	?
Structure sante	point	GPS, Numerisation, inconnue	?
Aire sante	polygon	Image satellite	?		covers only parts of Kwilu
Courbe niveau	vector	Ancienne base	coarse	Not useful
Vegetation	polygon	Ancienne base	very coarse	Not useful

At RGC there are a lot of data, missing at OSM:

Collectivités
Districts
Groupements
Localités
Parcs
Territoires
Végétation
Ecoles
Points d'eau
Cascade
Port
Bacs
Gare
Pont

This could be uploaded with no or very little redundance

From this secnd group, there would be more redundance.

Axes navigables
Hydro Linéaires
Hydro surfacique
Lacs
Aéroport completed
Route
Voies ferrées

If someone is able to upload it, I would verfiy and consolidate railways in the whole country and if needed the other ones in the former Oriental province.

I tried to upload railway station or railway lines, but I failed every timesand the error messages where to poor for me that I could found a solution :-( I hope someone else has more experience than me. --Männedorf 11:59, 23 May 2010 (UTC)

I checked some possibilities for importing the data. Finally I found a way that looks reasonable to me. Here what I figured out for the Hydro Linéaires

Load data into QGIS
Split according to origin - everything besides image satellite is questionable in terms or accuracy
convert to OSM using Ogr2osm
Load into JOSM, download OSM data and compare with Bing maps - this last step basically is due to the fact that I'm not familiar with Merkaartor.

A first check at some random location showed that quite some of the data is not available yet.

Note: Today I finally got Ogr2osm to work. This simplifies the conversion to osm significantly. It also allows automatic translation of attributes into tags.

Any thoughts on this? --Ohr 17:52, 21 December 2010 (UTC)

I started importing the rivers from the Hydro lineaire dataset. First I am working on those with names given. I did some tracking of progress on the page Cours_d'eau. --Ohr 21:41, 23 December 2010 (UTC)

Today I also uploaded the missing airports. --Ohr 19:43, 3 January 2011 (UTC)

I had uploaded most Parks and other protected areas' borders that seemed accurate. I've added them to WikiProject Congo-Kinshasa/Aires protégées. I guess only National parks should have boundary=national_park while Domaine de chasse (Hunting reserves) and Réserve (Reserves) should have leisure=natural_reserve instead. There are some other proposed tags but they are not rendered at the moment. The Hydro lineaire set is pretty good for the Image satellite part. Many airports are from old maps, and old databases with only precision with degrees and minutes (no second) so error can be 2 km, if the original map isn't wrong to start with. We also don't know which landing strips are still usable, RGC doesn't seem to cary that information. Same precision error goes for villages and towns. I only import those if the satellite imagery shows there's a place there or close by, and depending on what other sources say (if the place is mentioned as being on a specific road, etc.). Most of the major roads from GPS tracks have been imported, as least RN. --Moyogo 16:00, 6 January 2011 (UTC)

So would you recommend to delete the airports again, that are not from GPS? Sounds to me like this would be better. --Ohr 16:46, 6 January 2011 (UTC)

Yeah, I would recommend only keeping those from GPS. There others from Ancienne base are rather unsure. I don't know how we can evaluate their accuracy or current status. --Moyogo 06:03, 7 January 2011 (UTC)

Ok, I will take care of it. But I guess it will take a few days to get it done. --Ohr 09:48, 7 January 2011 (UTC)

If you have the changeset number (6853643 (achavi, OSMLab) apparently) it should be easier to revert automatically, see Change rollback or Revert scripts. ---Moyogo 21:26, 7 January 2011 (UTC)

The changeset 6853643 (achavi, OSMLab) has been partially reverted successfully. Partially because the airports based on GPS were maintained to avoid deleting and importing again. I used JOSM Reverter Plugin for this. --Ohr 19:46, 9 January 2011 (UTC)

The following datasets have significant GPS-based parts so I think they are candidates for (selctive) import:

Route - Major roads are already present but smaller ones, tracks, and paths could be added. Translation into tags should be straighforward from attributes. GPS data done
Localite - probably only in conjunction with roads for ease of checking GPS data done - except Kinshasa
Pont - if at all only together with roads. Questionable as represented as nodes, not ways.

All would need manual verification before or during the import to avoid duplicates.

The following datasets are also candidates with a very little risk of collision. Here the translation of attributes into tags might need some discussion:

Point_eau
Ecole - including université and institut superieure
Structure_sante

The GPS-based data are mainly concentrated in Kwilu, North Kivu, and South Kivu. Especially in Kwilu is are very densly mapped area available.

Quick status update:

The Route data requires significant fixing as it contains loops and duplicate ways. For this reason the converstion with ogr2osm fails.
The translation from attributes into tags is already defined.
I have postponed Structure_sante until Key:healthcare is decided.

--Ohr 16:54, 21 January 2011 (UTC)

Route could be fixed with GRASS GIS (using break, rmdupl, and generalize)
import of roads is in progress - existing correspondig roads are either updated or replaced

--Ohr 19:20, 31 January 2011 (UTC)

All GPS based data from the Route dataset are finally imported (if not already present before). --Ohr 18:15, 15 February 2011 (UTC)

Tag "place" pour la RDC (proposition)

Toponymie (place)

See Generic:Map Features:place.

Voir OSM_tags_for_routing sur l'interprétation de ces tags pour le routage (système de navigation).

Voir aussi la FAQ pour l'utilisation des areas et nodes pour décrire un endroit.