Re: [OSM-talk] Hack-Wochenende in Karlsruhe 2/3 Jun 2012

[Katie Filbert]

Am Apr 10, 2012 um 2:20 AM schrieb Frederik Ramm :


Hallo,

  da es beim letzten Mal eigentlich richtig nett war (http://blog.geofabrik.de/?p=134 
), dachten wir, wir machen das gleich nochmal:


http://wiki.openstreetmap.org/wiki/Karlsruhe_Hack_Weekend_June_2012


This is the same weekend as Wikimedia hackathon in Berlin so sadly I  
must miss OSM hack weekend.


Hope to join another time if there is another hack weekend.

Cheers,
Katie

(Ich bin neu im Berlin und leben hier für ein Jahre)



Wer Lust hat auf ein bisschen OSM-Fachsimpeln und Hacken, am 2./3.  
Juni in Karlsruhe, der ist herzlich willkommen! (Wer beim letzten  
Mal dabei war, darf auch gern wiederkommen.)


Bye
Frederik

--
Frederik Ramm  ##  eMail frede...@remote.org  ##  N49°00'09" E008°23 
'33"


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Re: [OSM-talk] Imagery parallax error in high altitude areas

[Russ Nelson]

Nathan Edgars II writes:
 > It's not as bad as it seems. Imagery is adjusted using an elevation 
 > dataset. Since this data doesn't (and shouldn't) include buildings and 
 > bridges, these appear distorted. You'll also see problems where recent 
 > heavy construction has caused changes in topography.

Or where the elevation dataset doesn't include a deep canyon, which
causes a straight bridge to appear curved. If it's a railroad, you can
be pretty sure it isn't. If it's a road bridge, you have to rely on
what you saw when you were there.

-- 
--my blog is athttp://blog.russnelson.com
Crynwr supports open source software
521 Pleasant Valley Rd. | +1 315-600-8815
Potsdam, NY 13676-3213  | Sheepdog   

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[OSM-talk] An example photo/video mapping trip

[Paul Norman]

A few GSoC students have made proposals relating to video and photo mapping.
As I make good use of photos from my car for mapping I thought I'd prepare a
set of annotate photos, pointing out objects that I map.

I've finished these and placed them at
http://pnorman.dev.openstreetmap.org/photomapping/example_photomap_highway.z
ip
The zip file includes the images, the GPX track and some notes. The image
files have coloured rectangles indicating different objects with the key in
the notes.

The trip is a mix of residential, industrial and highway travel. Most of the
time spent entering the data from this trip would normally be typing out the
tagging for POIs and shops.

My typical trip involves much less highway travel and much more travel
through retail and commercial landuse where I can spend a couple minutes
with one picture adding all the shops.

The photos were taken 10 seconds apart from a camera mounted in about the
middle-right of my car and my GPX track comes from my garmin.


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Re: [OSM-talk] Hack-Wochenende in Karlsruhe 2/3 Jun 2012

[Mike Dupont]

Hallo,
ich weiss nicht so weit im voraus ob ich Zeit habe, aber danke fuer die
Einladung, schauen wir mal.
mike

2012/4/10 Frederik Ramm 

> Hallo,
>
>   da es beim letzten Mal eigentlich richtig nett war (
> http://blog.geofabrik.de/?p=**134 ),
> dachten wir, wir machen das gleich nochmal:
>
> http://wiki.openstreetmap.org/**wiki/Karlsruhe_Hack_Weekend_**June_2012
>
> Wer Lust hat auf ein bisschen OSM-Fachsimpeln und Hacken, am 2./3. Juni in
> Karlsruhe, der ist herzlich willkommen! (Wer beim letzten Mal dabei war,
> darf auch gern wiederkommen.)
>
> Bye
> Frederik
>
> --
> Frederik Ramm  ##  eMail frede...@remote.org  ##  N49°00'09" E008°23'33"
>
> __**_
> talk mailing list
> talk@openstreetmap.org
> http://lists.openstreetmap.**org/listinfo/talk
>



-- 
James Michael DuPont
Member of Free Libre Open Source Software Kosova http://flossk.org
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[OSM-talk] Hack-Wochenende in Karlsruhe 2/3 Jun 2012

[Frederik Ramm]

Hallo,

   da es beim letzten Mal eigentlich richtig nett war 
(http://blog.geofabrik.de/?p=134), dachten wir, wir machen das gleich 
nochmal:


http://wiki.openstreetmap.org/wiki/Karlsruhe_Hack_Weekend_June_2012

Wer Lust hat auf ein bisschen OSM-Fachsimpeln und Hacken, am 2./3. Juni 
in Karlsruhe, der ist herzlich willkommen! (Wer beim letzten Mal dabei 
war, darf auch gern wiederkommen.)


Bye
Frederik

--
Frederik Ramm  ##  eMail frede...@remote.org  ##  N49°00'09" E008°23'33"

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Re: [OSM-talk] Download all OSM GPS traces

[Paul Norman]

> From: Ruogu Ding [mailto:ruogu.d...@kaust.edu.sa]
> Subject: [OSM-talk] Download all OSM GPS traces
> 
> Hi,
> 
> I find a "planet.gpx" is being offered but with only GPS points. I
> understand that this is helpful, and appreciate the efforts in
> generating this file. However, many people (like me) need GPS traces
> instead of individual points, and I personally prefer to see the
> associated descriptions too. Is it possible to compress all uploaded
> .gpx files and offer this large file for download? Identifiable traces
> are sufficient, if privacy is a problem.

Iandees is working on code to create a dump at 
https://github.com/iandees/planet-gpx-dump

I'm sure he'd welcome patches.


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Re: [OSM-talk] Download all OSM GPS traces

[Tom Hughes]

On 09/04/12 20:13, Ruogu Ding wrote:


I find a "planet.gpx" is being offered but with only GPS points. I
understand that this is helpful, and appreciate the efforts in
generating this file. However, many people (like me) need GPS traces
instead of individual points, and I personally prefer to see the
associated descriptions too. Is it possible to compress all uploaded
.gpx files and offer this large file for download? Identifiable traces
are sufficient, if privacy is a problem.


The current release is an interim solution and we intend to offer a more 
detailed download in due course that will preserve as much information 
as possible about each trace while still providing the level of privacy 
requested by the owner of each trace.


Tom

--
Tom Hughes (t...@compton.nu)
http://compton.nu/

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[OSM-talk] Download all OSM GPS traces

[Ruogu Ding]

Hi,

I find a "planet.gpx" is being offered but with only GPS points. I
understand that this is helpful, and appreciate the efforts in
generating this file. However, many people (like me) need GPS traces
instead of individual points, and I personally prefer to see the
associated descriptions too. Is it possible to compress all uploaded
.gpx files and offer this large file for download? Identifiable traces
are sufficient, if privacy is a problem.

Alternatively, is it possible to offer the planet.gpx like this:

45000,45000
45001,45000
45002,45000
91000,181000
33000,66000
33000,66001
33000,66002

In this way, we know that there are two traces, one of which is near
45N,45E while the other is near 33N,66E. Note that
"91000,181000" is not realizable and is used as a seperator.

To save space, I also suggest to use two 4-byte integers to store the
coordinate pair. The maximum value 181000 is within the limit of a
signed 4-byte integer, which is 2147483647. According to the stats,
there are 2811827999 uploaded GPS points, and each point takes only 8
bytes in this way - that is 22GB binary file instead of 55GB text file
now.

Thanks,

Ruogu Ding (丁若谷)
King Abdullah Univ. of Sci. & Tech.
+966-562609061
ruogu.d...@kaust.edu.sa

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[OSM-talk] Map wars: MapQuest, Microsoft and OSM vs Google

[paul youlten]

OSM in the news:

http://www.zdnet.com/blog/btl/microsofts-purchase-of-aol-patents-may-be-about-a-google-map-war/73489?tag=nl.e539

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Re: [OSM-talk] Relicensing timeline

[Andrew]

Elena ``of Valhalla''  gmail.com> writes:

> We would like not to do that mostly for one reason: the streets 
> we want to map are in an area where gps reception isn't very good, 
> so we planned to use walking papers (or other printouts of current 
> OSM data).
> 
> If the license switch hasn't happened yet such printouts would be 
> tainted by the old license, and we would risk using a tained 
> printout even if we try to delete existing objects before 
> the mapping party (how can we be sure that we have deleted everything?)

Have you ever tried using Walking Papers with aerial photographs?

--
Andrew





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Re: [OSM-talk] Rendering of sidewalks

[Tobias Knerr]

Nathan Edgars II wrote:
> I'm wondering if anyone's created a rendering that takes sidewalk=* tags
> and places a line on the correct side(s) of the roadway.

It's not a "normal" renderer, but OSM2World (http://osm2world.org/)
shows them. On a close-up perspective rendering, it looks like this:

http://tobias-knerr.de/upload/FOSSGIS12_lanes.png

They are also present in the slippymap on http://maps.osm2world.org/
However, it only goes to zoom 18 and the sidewalks usually have the same
surface texture as the carriageway, so they are hard to see there.

The approach is probably pretty different from what you would do in a 2D
rendering, though.

Tobias

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[OSM-talk] Rendering of sidewalks

[Nathan Edgars II]

I'm wondering if anyone's created a rendering that takes sidewalk=* tags 
and places a line on the correct side(s) of the roadway.


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Re: [OSM-talk] Imagery parallax error in high altitude areas

[Nathan Edgars II]

On 4/1/2012 10:53 AM, Arun Ganesh wrote:

It recently struck me while identifying mountain peaks in the himalayas
that something may not be right. All of us have noticed that the top of
skyscrapers is off from the base of the building owing to parallax error
of the satellite capturing the image at an angle. The average seems to
be around a 0.2m displacement for every 1m increase in height (based on
calculations made in a couple of cities in India). For an imagery tile
which has 1000m variation in elevation, various objects could be
displaced by as much as 200m from its real position.


It's not as bad as it seems. Imagery is adjusted using an elevation 
dataset. Since this data doesn't (and shouldn't) include buildings and 
bridges, these appear distorted. You'll also see problems where recent 
heavy construction has caused changes in topography.


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[OSM-talk] Traffic simulation Modeling using OSM data

[sourav dutta]

Hi,
Sorry for mailing in so late, i came to know about Gsoc few days ago.
I am Undergraduate doing my Btech-Hons for IIIT - Hyderabad. I have worked
in OCR, Vision,(Sfm) ,Image Processing,Information retreval.

OSM data have been used for path finding...with A star algo etc.but it is
never used for simulation of traffic.

Traffic monitoring and simulation has been worked on for some time now.
There are very elaborate systems like MITSIM which gather data from
various sources  and  design a traffic model. But the problem is it is very
difficult to implement them. The information about the streets, traffic
data, satellite data etc. is difficult to gather.
 My idea is to design a traffic simulation using OSM data. as the OSM
data is readily available and is available in many formats. To model the
traffic probabilistic or network flow models are popular. But to get a more
accurate simulation want to use  multiple vehicles as bots interacting with
each other.
A basic overview of my idea ...

1) first we need the area where want the simulation to run. This would be
done by defining a rectangular region in the map. This data can be stored
   in posgreSQL which will make it easier to use the data.
2) Next we define for all the bots - source and destination and this find
the appropriate path(A star) to go.
3) At the heart of the simulation we need to have a engine which would
handle the collision etc. and directs the bots etc. I have tried a few
physics
   engine but their performance degrades steeply decreases with the
increase of number of objects.
4)  So I want to use my own engine with only few rules for collision etc.
The brute for implementation would require to check each bot with other bot
   ( the same thing which makes other engines slow O(n^2) ). But i plan to
use a implementation of KD-tree, ANN(Approximate nearest neighbour) Open
  source  implementation of the same exists and works pretty well. This
would allow the matching to be done in O(nlogn).
   ANN implementation (http://www.cs.umd.edu/~mount/ANN/)
5) To manage the interaction of the bots the memory requirements skyrockets
as the number of bots increases. ie why i wish to treat them as
Multi-Agent-System
There are nice implementations of "distributed multi-agent framework"
which use shared memory to manage the agents( bots in our case).
6)  congestions , bottlenecks and collisions can thus be detected. In the
streets.
7) Future Works - Once this frameworks is complete data from other sources
like the traffic lights flyovers etc.. can be incorporated in the existing
system.



-- 
Sourav Dutta
200901068
CSE,UG3
IIIT H
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