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Mapping the narrow gauge railway of Fiji

Posted by Rikki on 16 February 2011 in English.

To celebrate the addition of the Bing satellite imagery for my favourite armchair mapping location, Fiji, I decided to map the 2 ft (610 mm) narrow gauge sugarcane railway.

I have done a fair bit of mapping around Fiji over the years using limited Yahoo imagery. In fact, one of my earliest edits was for Fiji. The country was blank in OpenStreetMap at the time, so it was my sandbox, a place to learn without the wrath of getting into an edit war with more experienced mappers.

Since then, a local OSM editor, strangepants, has done a fantastic job of mapping the capital, Suva.
osm.org/?lat=-18.1351&lon=178.4506&zoom=13&layers=M

The Bing imagery appears to be of a higher resolution that Yahoo, which makes the tracing map features easier. The only problem is it seems to out by 7-10m. You can tell by the very limited GPS tracks in the area. Therefore, I would not go shifting roads to match Bing imagery without checking the existing of GPS tracks first.

So, for the last couple of weeks I have tracing the narrow gauge railway from Sigatoka (the closest end to Suva), Nadi, Lautoka and Ba. Here is what I have learnt.

Sugarcane railways are a mixture of order and chaos. Sometimes when I lost my little railway line, I would have to zoom out or use Google Earth to zoom in closer to see where track was going. The railway line in Fiji runs in the grass, along roads, in the road, through village streets. It weaves and curls around the sugarcane fields all over the place.

There are telltale signs of the existence of sugarcane railway: a string of brown rectangles. These are loaded wagons. This was one of the signs I looked for when picking up the line again.

The only annoyance so far is the broken track at Nadi. Because of cloud cover in the imagery, I am unable to join the track up.

I wonder what completion percentage of railway is so far. I know from the CIA World Factbook, that there are 597 km of railways. Not sure how to calculate the length of railways for Fiji...

There are more tracks to trace, but it’s good see the progress so far. I might go back to tracing roads, but there’s no rush. I’m doing it on “Fiji time”.

Location: Nasolo, Ba, Western, Fiji
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Discussion

Comment from Rikki on 16 February 2011 at 02:17

Just to clarify one point: I only use Google Earth zoom to confirm what I am seeing in Potlatch is the railway. All tracing mentioned above is with Bing/Yahoo. Nothing is copied from Google.

Comment from AndrewBuck on 16 February 2011 at 15:56

Regarding the area that has cloudcover, you may want to consider connecting them up with just a staright segment which forms its own way. Tag it like you are tagging the rest of the railroad and just include a 'fixme' stating that the location is not correct but the railway still is there somewhere.

Although I don't think anyone is doing "routing" on the rail networks like they are with roads/footways, someone may want to do some analysis of rail connectivity and adding in that segment would help with things of that sort (including your question of how much rail is therein fiji).

Anyway, glad to see other people working on stuff like this. It is this rich variety of data that makes OSM so useful. Keep up the good work.

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