[OSM-talk] Contour lines

2010-04-13 Thread Andrew Errington
Hi all, Is there a WMS layer or other data source for contour lines? I am improving the outline of the water in a reservoir. I have checked Yahoo! aerials to see the nominal area of the reservoir and I have chosen a particular contour line on OSM Cycle Map to trace along with Potlatch. This

Re: [OSM-talk] Contour lines

2010-04-13 Thread Gregory
On 13 April 2010 01:26, Andrew Errington a.erring...@lancaster.ac.ukwrote: I have checked Yahoo! aerials to see the nominal area of the reservoir and I have chosen a particular contour line on OSM Cycle Map to trace along with Potlatch. This will give a pleasing representation of the area

Re: [OSM-talk] Contour lines

2010-04-13 Thread Steve Hill
On Tue, 13 Apr 2010, Gregory wrote: What makes you think the Yahoo! imagery and/or the contour lines shown on the Cycle Map(these contours are from SRTM data, not OSM) are more up to date or more accurate/precise than the existing water body drawn in OSM? Indeed. Also, ISTR the cycle map

Re: [OSM-talk] Contour lines

2010-04-13 Thread Igor Brejc
On Tue, Apr 13, 2010 at 10:59 AM, Steve Hill st...@nexusuk.org wrote: I don't think the SRTM contours are accurate enough to use for tracing bodies of water - you need to walk the perimeter with a GPS or use aeriel photos. They aren't. There's also another source called SRTM Water Body

Re: [OSM-talk] Contour lines

2010-04-13 Thread Claudius
Am 13.04.2010 10:48, Gregory: On 13 April 2010 01:26, Andrew Errington a.erring...@lancaster.ac.uk mailto:a.erring...@lancaster.ac.uk wrote: I have checked Yahoo! aerials to see the nominal area of the reservoir and I have chosen a particular contour line on OSM Cycle Map to

Re: [OSM-talk] Contour lines

2010-04-13 Thread Liz
On Tue, 13 Apr 2010, Steve Hill wrote: SRTM data may be useful for guestimating flowing water courses that can't be otherwise surveyed, I can show you SRTM data that shows elevations in the flat plain at all the watercourses - it picks off the the tree tops which grown in the river bed and

Re: [OSM-talk] Contour lines

2010-04-13 Thread Gregory
On 13 April 2010 01:59, Steve Hill st...@nexusuk.org wrote: ...for tracing bodies of water - you need to walk the perimeter with a GPS... I've always wanted to fix up a pole about 6-10ft with a secure GPS mount on one end, and possibly a harness or neck strap to carry the other end on me. Then

Re: [OSM-talk] Contour lines

2010-04-13 Thread Steve Hill
On Tue, 13 Apr 2010, Gregory wrote: I've always wanted to fix up a pole about 6-10ft with a secure GPS mount on one end, and possibly a harness or neck strap to carry the other end on me. Then walk along the side of a river/lake at a safe distance with my GPS hovered above the line where the

Re: [OSM-talk] Contour lines

2010-04-13 Thread Andy Allan
On Tue, Apr 13, 2010 at 9:59 AM, Steve Hill st...@nexusuk.org wrote: On Tue, 13 Apr 2010, Gregory wrote: What makes you think the Yahoo! imagery and/or the contour lines shown on the Cycle Map(these  contours are from SRTM data, not OSM) are more up to date or more accurate/precise than the

Re: [OSM-talk] Contour lines

2010-04-13 Thread Andrew Errington
On Tue, 13 Apr 2010 17:59:47 Steve Hill wrote: On Tue, 13 Apr 2010, Gregory wrote: What makes you think the Yahoo! imagery and/or the contour lines shown on the Cycle Map(these contours are from SRTM data, not OSM) are more up to date or more accurate/precise than the existing water body

Re: [OSM-talk] Contour lines

2010-04-13 Thread Keith Sharp
On Tue, 2010-04-13 at 11:14 +0200, Claudius wrote: Am 13.04.2010 10:48, Gregory: On 13 April 2010 01:26, Andrew Errington a.erring...@lancaster.ac.uk mailto:a.erring...@lancaster.ac.uk wrote: I have checked Yahoo! aerials to see the nominal area of the reservoir and I have

Re: [OSM-talk] Contour lines

2010-04-13 Thread Steve Hill
On Tue, 13 Apr 2010, Andrew Errington wrote: My GPS accuracy (reported by the device itself) is at best 4m, but in mountainous regions or in cities it is 5m or 6m at best, often worse. How accurate is my mouse when I click on a pixel? Visually I am interpolating the (inaccurate) GPS trace

Re: [OSM-talk] Contour lines

2010-04-13 Thread John Smith
On 13 April 2010 23:01, Andrew Errington a.erring...@lancaster.ac.uk wrote: I'm still tempted to get an RC boat and tape the GPS on top. Some people are playing with RC planes and GPS + cameras... ___ talk mailing list talk@openstreetmap.org

Re: [OSM-talk] Contour lines

2010-04-13 Thread Steve Doerr
On 13/04/2010 11:20, Andrew Errington wrote: Having said that, I have just compared my changes with Google aerials, Google Maps, and another two mapping providers. They are all different, but mine is a little high, so I am going to choose the next lowest contour. If the place is in the UK,

Re: [OSM-talk] Contour lines from SRTM-Data in OSM format

2008-11-16 Thread maning sambale
CE, I am interested to get Phiilippine contours in img http://openstreetmap.org/?lat=12.24lon=122.07zoom=6layers=B000FTF cheers, maning On Sat, Nov 15, 2008 at 8:00 AM, Christoph Eckert [EMAIL PROTECTED] wrote: Hi, I have used srtm2osm (all credits to Igor Brejc) to convert srtm data into

Re: [OSM-talk] Contour lines from SRTM-Data in OSM format

2008-11-15 Thread Nic Roets
I believe srtm2osm uses void filled data that is copyrighted. So is you do distribute the results make sure that you specify it's only for academic research. IANAL. I used srtm2osm to make an OSM file of over 1 GB and played around with it in gosmore. Distributing gosmore files that include srtm

Re: [OSM-talk] Contour lines from SRTM-Data in OSM format

2008-11-15 Thread Igor Brejc
Nic Roets wrote: I believe srtm2osm uses void filled data that is copyrighted. So is you do distribute the results make sure that you specify it's only for academic research. IANAL. No, it uses original SRTM data downloaded directly from NASA's FTP server. Regards, Igor --

Re: [OSM-talk] Contour lines from SRTM-Data in OSM format

2008-11-15 Thread Christoph Eckert
Hi, I believe srtm2osm uses void filled data that is copyrighted. So is you do distribute the results make sure that you specify it's only for academic research. IANAL. No, it uses original SRTM data downloaded directly from NASA's FTP server. I've been on the SRTM pages a couple of

Re: [OSM-talk] Contour lines from SRTM-Data in OSM format

2008-11-15 Thread Igor Brejc
Christoph Eckert wrote: Hi, I believe srtm2osm uses void filled data that is copyrighted. So is you do distribute the results make sure that you specify it's only for academic research. IANAL. No, it uses original SRTM data downloaded directly from NASA's FTP server. I've

Re: [OSM-talk] Contour lines from SRTM-Data in OSM format

2008-11-15 Thread Matt Amos
On Sat, Nov 15, 2008 at 10:10 AM, Igor Brejc [EMAIL PROTECTED] wrote: Well, first of all, CycleMap uses the same SRTM data (as far as I know), so if the license is an issue, this applies to CycleMap too. I haven't been able to find any info directly describing the license of SRTM, but, as far

[OSM-talk] Contour lines from SRTM-Data in OSM format

2008-11-14 Thread Christoph Eckert
Hi, I have used srtm2osm (all credits to Igor Brejc) to convert srtm data into OSM contour lines. All tiles are zippes in zip format and the complete world consumes 61G of disk space. See some example at [1]. I have some questions so far: * I have no clue if there's some interest in the data,