I need to estimate how long it takes to get 1km2 into osm. I only need the streets and the houses; additional information like restaurants will come from somewhere else.

So did I understand the process correctly:

  1. walk walk walk get some data
  2. import the data to osm. It's just a few clicks and my streets are shown, automatically generated. Then maybe correct some mistakes, but I think that wont be much work?
  3. Add the houses and stuff.

Is that correct? So I thought that if I have 10 people working on this, that it would be complete in 3 hours maximum?

Is that correct? Especially the part with importing the data. The streets are generated out of this data, right?

Thanks :) and maybe you got some links for me.

asked 18 May '11, 15:59

handbuch's gravatar image

handbuch
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edited 18 May '11, 18:09

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Andy Allan
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10 people will cover much more then 1 km^2 in 3 hours. Although the speed varies a lot.

First you have to walk/cycle/drive all the streets and collect data. The time it takes depends on how fast you are going, how much data you care about and how much you have to backtrack e.g. dead ends.

The next step (hopfully after some food and rest) is to upload the traces and add the streets. This is not done automaticly as a computer have a hard time interpreting raw data.

Try the beginners' guide to learn more.

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answered 18 May '11, 16:23

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Gnonthgol ♦
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accept rate: 16%

1

Also note that it will take some time (~1h) for new mappers to get used to Potlatch 2 (or some other editor).

(18 May '11, 16:52) RM87
2

My rule of thumb has always been it takes roughly the same amount of time to add the data to OSM as it does to map - if you spend 2 hours out mapping it'll take 2 hours to input the data. Obviously this varies, especially if your time out mapping consists mainly of walking around not recording much!

(18 May '11, 18:10) Andy Allan

I have found it depends on experience (in terms of surveying and editing), as well as area density and detail levels, and the quality you aim for.

I have estimated areas before, and I work with 6 levels of population density. Around 30 people per square km, then 100, then 180, then 300, then 700, then 3500. basically, sparce, rural, big villages, towns, cities, city terraced housing.

It's quite simple in a table I have, but seems confusing when typed. So I'll list the Kilometres Square I estimate I can map for the 6 levels from sparse to dense, and in each set firstly just roads, then paths and tracks, then all natural features (hedges/fences/woods etc).

(14km2, 0.8km2, 0.4km2) (8km2, 0.7km2, 0.4km2) (3.2km2, 0.6km2, 0.44km2) (1.6km2, 0.5km2 ,0.48km2) (0.56km2, 0.48km2, 0.53km2) (0.7km2, 0.68km2, 0.68km2)

With Roads, and some additional information, in usual urban areas therefore I'd guess that I would map at about 0.5km2 per hour each. so 2.5km2 for 10 of you per hour. (guess based on having photo reference for speed, and using josm)

I think there's a lot of varying factors though, and these numbers are just based on how 'I' do it, where I live.

Also the reason very dense is quicker than dense areas is becuase if time saving techniques like just marking street ends, and also the lack of anything but housing usually in such areas.

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answered 19 May '11, 00:53

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Ben
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When you are a bit more experienced with OSM data modelling you can even load your recorded GPS tracks in one of the available offline-editors. This loading is done immediately.

After that, download the already existing data from the central OSM server according to the area that is covered by your recorders track. This is done in a few seconds.

Than you have to draw all ways, points and objects in a kind of vector data that are not yet included in the OSM data. The time amount for this differs strongly by the grade of missing objects and the editor's skills about handling the editors program. This is the most time consuming part.

After all edits and new objects are tagged as desired, do an upload of that data to the central OSM server. This is also done in seconds.

But I think that 10 people CAN cover your desired area in 3 hours.

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answered 18 May '11, 17:30

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stephan75
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edited 18 May '11, 17:31

streets and roads can be traced and edited in a short time,but if you are going the draw in all the buildings in from bing and tag then all with numbers it will take ages as would the collection of numbers on the ground as they should not be copied from another map as there maybe copyright traps.best way estimate do a little then do the maths good luck!

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answered 19 May '11, 09:01

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andy mackey
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hmm, bing didnt have had background images. How can i get them? Thansk for the guide. The 10 ppl dont know osm. Thanks, just need the houses and the streets.

Is there a video or somethign wheresomeone uploads gps data and build a street out of it?

So imagen i go somewhere, walk around and put the gps data into my drawingtool. Then i see where i just walked, right? And can draw the streets on it.

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answered 19 May '11, 09:13

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handbuch
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edited 19 May '11, 11:49

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question asked: 18 May '11, 15:59

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