[Openstreetmap] Free software grants

Hugh Barnard hugh.barnard at laposte.net
Sat Feb 19 17:13:19 GMT 2005


Hi Folks

This:
http://www.affs.org.uk/grants/
could provide image data or a group owned GPS perhaps...
best regards Hugh


----- Original Message ----- 
From: <openstreetmap-request at vr.ucl.ac.uk>
To: <openstreetmap at vr.ucl.ac.uk>
Sent: Saturday, February 19, 2005 3:52 PM
Subject: Openstreetmap Digest, Vol 6, Issue 11


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> Today's Topics:
>
>    1. Areal photos for free? (Petter Reinholdtsen)
>    2. Re: Areal photos for free? (Andy Armstrong)
>    3. Re: Areal photos for free? (Andy Armstrong)
>    4. an introduction to using Landsat data with GRASS
>       (Abhijit Menon-Sen)
>    5. gpx uploading and more (SteveC)
>    6. Re: gpx uploading and more (Petter Reinholdtsen)
>    7. Re: Areal photos for free? (Amaury Jacquot)
>    8. Complimentary project - Freemap (Nick Whitelegg)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 18 Feb 2005 17:19:52 +0100
> From: Petter Reinholdtsen <pere at hungry.com>
> Subject: [Openstreetmap] Areal photos for free?
> To: openstreetmap at vr.ucl.ac.uk
> Message-ID: <2flis4pu9g7.fsf at saruman.uio.no>
> Content-Type: text/plain; charset=us-ascii
>
>
> Yesterday, I talked to a friend about the Openstreetmap project.  He
> happened to pilot in his spare time (cesna), and he liked the idea of
> taking aerial photos while he was flying.  All we need is a way to
> clamp the camera to the plane, make sure a GPS is included, and
> collect photos.  Perhaps there are friendly pilots in the London area
> as well?
>
> I've started taking some notes on what is needed.
>
>
> Aerial photos for free
> ======================
>
> We can get aerial photos for free by contacting friendly small plane
> pilot, and get them to bring photo equipment on their trips.
>
> What should the equipment look like?
>
>  - gps
>  - camera (still/video?)
>  - laptop for storage
>  - correct clock (why?)
>  - the shape need to be aerodynamic
>  - simple mounting and dismounting on wing or wheel (norsk: stag)
>  - barometric height
>  - what resolution do we need for the camera
>
> Start with a fairly large (1.5 liter) bottle, to get some fairly
> aerodynamic shape.  Cut it open, remove one part of the side (for the
> view window).  Place the camera and the gps inside this bottle
> (fastened on a plane, showed into the bottle?), close to each other.
>
> The camera and the gps should be close to each other to make sure the
> position error of camera matches that of the position error of the
> gps.  (Is this really necessary, if the relative position of the GPS
> and the camera is know?)
>
> Need to find a way to fill the window area.  Plexiglass?
>
> Use a USB or firewire (DV) camera and a USB GPS, connect them to a
> laptop.  Write some software to collect pictures and GPS position as
> often as possible.  What resolution and frame rate is interesting?
> Depends on the plane speed, I guess.
>
> How do we find the height?  GPS height are very inaccurate, and
> barometric height are not directly related to the geoid or ellipsoid
> height.
>
> Sketch:
>
>           +------------------+
>          /
>    +----+        GPS
>    |       -----------------
>    +----+       Camera
>          \        ||
>           +---+ window + ----+
>
> Error factors
>  - position error
>  - camera angle
>  - ray bending through window
>  - lens distortion
>  - camera pixel size / skew
>
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 18 Feb 2005 16:38:09 +0000
> From: Andy Armstrong <andy at hexten.net>
> Subject: Re: [Openstreetmap] Areal photos for free?
> To: Petter Reinholdtsen <pere at hungry.com>
> Cc: openstreetmap at vr.ucl.ac.uk
> Message-ID: <ad181a5d51164d3027a3accf6918473e at hexten.net>
> Content-Type: text/plain; charset=US-ASCII; format=flowed
>
> On 18 Feb 2005, at 16:19, Petter Reinholdtsen wrote:
> > The camera and the gps should be close to each other to make sure the
> > position error of camera matches that of the position error of the
> > gps.  (Is this really necessary, if the relative position of the GPS
> > and the camera is know?)
>
> The parallax error due to not knowing exactly which direction the
> camera is potentially huge compared with any error due to the relative
> position of the GPS and the camera. It's also a /really big job/ to
> photograph the whole country from a light aircraft - or even any
> significant area. In addition aren't there huge no-fly zones for light
> aircraft? Significantly they'd be over cities.
>
> -- 
> Andy Armstrong, hexten.net
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 18 Feb 2005 16:40:12 +0000
> From: Andy Armstrong <andy at hexten.net>
> Subject: Re: [Openstreetmap] Areal photos for free?
> To: Andy Armstrong <andy at hexten.net>
> Cc: openstreetmap at vr.ucl.ac.uk
> Message-ID: <8b3a3c211bbaad7d60422f490ad175b3 at hexten.net>
> Content-Type: text/plain; charset=US-ASCII; format=flowed
>
> On 18 Feb 2005, at 16:38, Andy Armstrong wrote:
> > The parallax error due to not knowing exactly which direction the
> > camera is potentially huge compared with any error due to the relative
> > position of the GPS and the camera. It's also a /really big job/ to
> > photograph the whole country from a light aircraft - or even any
> > significant area. In addition aren't there huge no-fly zones for light
> > aircraft? Significantly they'd be over cities.
>
> A better approach might be not to worry too much about the absolute
> position and orientation of the camera and just take loads of pictures
> then work out where they are by correlating them with some ground based
> surveying.
>
> -- 
> Andy Armstrong, hexten.net
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 18 Feb 2005 22:27:54 +0530
> From: Abhijit Menon-Sen <ams at wiw.org>
> Subject: [Openstreetmap] an introduction to using Landsat data with
> GRASS
> To: openstreetmap at vr.ucl.ac.uk
> Message-ID: <20050218165754.GA26342 at penne.toroid.org>
> Content-Type: text/plain; charset=us-ascii
>
> Hi.
>
> I put together a brief explanation of how to create composite mosaics of
> Landsat scenes, based on the notes I made while playing around. Since we
> have discussed using satellite imagery here, I figured it might prove to
> be useful to someone.
>
> <http://www.oryx.com/ams/landsat.html>
>
> Questions, comments, and suggestions are welcome.
>
> -- ams
>
>
>
> ------------------------------
>
> Message: 5
> Date: Fri, 18 Feb 2005 18:17:31 +0000
> From: SteveC <steve at fractalus.com>
> Subject: [Openstreetmap] gpx uploading and more
> To: openstreetmap at vr.ucl.ac.uk
> Message-ID: <20050218181731.GC12396 at fractalus.com>
> Content-Type: text/plain; charset=us-ascii
>
> Hello all,
>
> I hooked up things so you can now create a user account:
> http://www.openstreetmap.org/api/newUser.jsp
>
> And you can upload your gpx files too:
> http://www.openstreetmap.org/api/uploadGPX.jsp
>
> The upload is quite quick: about 1000 points / second, and it tells you
> the progress.
>
> (Petter: I'm uploading all of yours apart from
>
http://developer.skolelinux.no/~pere/gis/openstreetmap/data/oslo-strip-10.71-10.76-59.93-59.955.gpx.gz
> since I guessed it overlaps with others?)
>
> Subject to a few details documented here:
> http://www.openstreetmap.org/wiki/index.php/UserDocumentation
>
> You can now enter the inevitable bugs against things too:
> http://www.openstreetmap.org/bugzilla/
>
> Comments welcome as always.
>
> I'm gonna work on hooking these things together into a coherent user
> interface for managing tracks (eg cookie support, and stuff). Once
> you've uploaded a track it is immediately visible via the applet, but
> there is no feature to move the map to your track yet - not hard to do.
>
> Oh, and I'm going to write a viewer that uses static images rather than
> the applet.
>
> note: The URLs will change apart from /api/xml.jsp
>
> have fun,
>
> SteveC steve at fractalus.com http://www.fractalus.com/steve/
>
>
>
> ------------------------------
>
> Message: 6
> Date: Fri, 18 Feb 2005 19:31:23 +0100
> From: Petter Reinholdtsen <pere at hungry.com>
> Subject: Re: [Openstreetmap] gpx uploading and more
> To: openstreetmap at vr.ucl.ac.uk
> Message-ID: <20050218183123.GB791 at saruman.uio.no>
> Content-Type: text/plain; charset=us-ascii
>
> [SteveC]
> > Hello all,
>
> Hi.  You are missed on #geo. :)
>
> > I hooked up things so you can now create a user account:
> > http://www.openstreetmap.org/api/newUser.jsp
> >
> > And you can upload your gpx files too:
> > http://www.openstreetmap.org/api/uploadGPX.jsp
>
> Cool.  I've created an account.  You should link in the license on the
> upload page as well, and link to the create user account page from the
> upload page.
>
>
> > (Petter: I'm uploading all of yours apart from
> >
http://developer.skolelinux.no/~pere/gis/openstreetmap/data/oslo-strip-10.71-10.76-59.93-59.955.gpx.gz
> > since I guessed it overlaps with others?)
>
> Yes, it overlaps with others.  You should not import dump.gpx.gz as
> well (please remove it), as it will be replaced by other files (I am
> working on a better export) when I generate one file per month for
> that data.
>
> > I'm gonna work on hooking these things together into a coherent user
> > interface for managing tracks (eg cookie support, and stuff). Once
> > you've uploaded a track it is immediately visible via the applet,
> > but there is no feature to move the map to your track yet - not hard
> > to do.
>
> I was just told on IRC that the applet almost worked with a free Java
> VM.  One of the Debian Java developers are on my request using the
> openstreetmap java applet as a test case, and is fixing the needed
> features as we speak. :)
>
> > Oh, and I'm going to write a viewer that uses static images rather
> > than the applet.
>
> I would recommend using mapserver or similar, to avoid having to write
> this from scratch.  If you store the points using OpenGIS SQL (for
> exapmle PostGIS), you can hook up bith mapserver, qgis and grass
> directly into the database.
>
>
>
> ------------------------------
>
> Message: 7
> Date: Sat, 19 Feb 2005 10:53:43 +0100
> From: Amaury Jacquot <sxpert at esitcom.org>
> Subject: Re: [Openstreetmap] Areal photos for free?
> To: Petter Reinholdtsen <pere at hungry.com>
> Cc: openstreetmap at vr.ucl.ac.uk
> Message-ID: <42170CA7.9010106 at esitcom.org>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> Petter Reinholdtsen wrote:
> > Yesterday, I talked to a friend about the Openstreetmap project.  He
> > happened to pilot in his spare time (cesna), and he liked the idea of
> > taking aerial photos while he was flying.  All we need is a way to
> > clamp the camera to the plane, make sure a GPS is included, and
> > collect photos.  Perhaps there are friendly pilots in the London area
> > as well?
> >
> > I've started taking some notes on what is needed.
> >
> >
> > Aerial photos for free
> > ======================
> >
> > We can get aerial photos for free by contacting friendly small plane
> > pilot, and get them to bring photo equipment on their trips.
> >
> > What should the equipment look like?
> >
> >  - gps
> >  - camera (still/video?)
> >  - laptop for storage
> >  - correct clock (why?)
> >  - the shape need to be aerodynamic
> >  - simple mounting and dismounting on wing or wheel (norsk: stag)
> >  - barometric height
> >  - what resolution do we need for the camera
>
> imho, you'd also need an inertial sensor, so that you can identify the
> attitude of the plane, which would make calculating the direction the
> photo was taken much easier
>
> GPS altitude is not that bad. error is about 4-10 meters or so, which is
> irrelevant when you are at 500 - 1000 meters from the ground (about 1%)
>
>
>
> ------------------------------
>
> Message: 8
> Date: Sat, 19 Feb 2005 10:43:22 +0000
> From: Nick Whitelegg <nick at hogweed.org>
> Subject: [Openstreetmap] Complimentary project - Freemap
> To: openstreetmap at vr.ucl.ac.uk
> Message-ID: <200502191043.22821.nick at hogweed.org>
> Content-Type: text/plain;  charset="us-ascii"
>
> Hello,
>
> I've already been in discussion with Steve about this, but I thought that
some
> people might be interested in a complementary project to OpenStreetMap -
> Freemap (www.free-map.org.uk), which aims to map the countryside rather
than
> provide a full streetmap.
>
> Nick
>
>
>
>
> ------------------------------
>
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> End of Openstreetmap Digest, Vol 6, Issue 11
> ********************************************





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