OpenStreetMap

Mapping request of Norway's villages

Posted by pieleric on 26 May 2012 in English (English)

Hello, I'm planning to go on holiday to Norway next month. I've checked, and although a lot is already mapped, there are quite a few towns or villages through which I'm planning to pass which are not mapped. With the latest Bing imagery, it seems possible to map the roads and streets of quite a few.

Here is the list:

So if you happen to feel like doing a bit of chair mapping, give me a hand :-) Of course, once I'll be in Norway, I'll take the opportunity to review the streets, and add information where ever I can!

Cheers,

Éric

PS: the high-res imagery seems pretty well aligned (better than the coastline) but it's still worthy to check the alignment with some GPS traces around.

Comment from Gnonthgol on 26 May 2012 at 13:47

No, it is not possible to map theese places with images from Bing. It is almost perfectly alligned with the coastline, but just a few meters above the sea it is so distorted that it is worse then nothing.

My guess is that Bing have not ortorectified any of the images in Norway at all, or that they have used SRTM as a DEM that is not available in Norway. With most of Norway covered in mountains and the rest with steep hills it is impossible to get any sense out of the Bing images.

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Comment from Skippern on 26 May 2012 at 14:22

Besides, for many rural areas of Norway local knowledge is the key to adding about any names to the map. The area where I grew up had atleast at my last visit no roafsigns informing placenames that can have values as addresse. Some places streetnames can be found on signs though.

Except for villages (tettsteder) fewrural places are signed

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Comment from pieleric on 26 May 2012 at 23:31

@Gnonthgol Could you explain more the problem, I'm not sure I'm following. You mean that the imagery is correctly aligned for the coastline, but for everything in altitude it becomes shifted (due to the view from the plane in "diagonal")?

For villages, which are in many cases situated at low altitude on relatively flat areas, shouldn't this distortion be small? Isn't having the streets and their intersections approximately situated better than nothing at all? Especially, with a couple of GPS traces, it should be possible to realign all the streets of a village?

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Comment from Guttorm Flatabø on 4 January 2013 at 10:37

You've understood the problem correctly. However, most places are not very flat, and distortion occurs almost everywhere and changes over short distances. You therefore always need gps traces in addition and knowledge about the elevation changes of the area.

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