Hi All I'm writing a fun GPS-centred website at the moment - http://www.runsaturday.com I'm currently integrating our database with the wonderful...
1956
Robert Lipe
robertlipe
Mar 14, 2009 2:55 pm
... insist on the GPX including timestamps for all trackpoints. ... The rationale for their preference would be best asked of them. We could speculate that...
1957
Mike Collinson
ewmjc
Mar 14, 2009 5:17 pm
... I am a contributor of a very large number of tracks to OSM and always use GPX 1.1. There is a however a requirement for timestamps for all trackpoints....
1958
Jean-Claude Repetto
jrepetto2001
Apr 7, 2009 12:56 pm
... Hello, I have the same problem. I am currently writing a GPS software that will generate GPX files, but I don't know if the <ele> files should contain the...
1959
Dan Foster
topografix
Apr 7, 2009 5:52 pm
Hello, ... There was discussion of this around August 4, 2003 - you can use the Yahoo Groups web archive to read these old messages. Dan Foster wrote: [gpsxml]...
1960
Jean-Claude REPETTO
jrepetto2001
Apr 7, 2009 7:55 pm
... Hello Dan, Thanks for your answer. To summarize the result of the 2003 discussion : ele = height above mean sea level (geoid) h = height above WGS84...
1961
Michael A. Peters
funkyres
Apr 7, 2009 8:16 pm
... I wouldn't worry too much about what garmin uses - I can walk 5 feet on a fairly mild slope and see the elevetion jump 100 feet. I've even seen it jump...
1962
Paul Tomblin
canoe
Apr 7, 2009 8:26 pm
... I went kayaking on Lake Ontario on Saturday, and my Garmin Forerunner said that I'd climbed 83 feet and descended 81 feet. I don't think Lake Ontario...
1963
Brian Scearce
blscearce
Apr 7, 2009 9:19 pm
... Holy crap, you paddled all the way from Hamilton to Kingston in a day?...
1964
Paul Tomblin
canoe
Apr 7, 2009 9:58 pm
... Not even close. I only did 5 miles out and back. That's why the 83 foot elevation change is so ridiculous. -- "You didn't need to. You sold ours." - Jon...
1965
Simon Slavin
simonslavin
Apr 7, 2009 11:08 pm
... Yes. In another place we had a discussion about this and reached similar confusion. In addition, this other place is mostly about devices where...
1966
Paul Tomblin
canoe
Apr 7, 2009 11:17 pm
On Tue, Apr 7, 2009 at 7:04 PM, Simon Slavin ... I think I can state pretty confidently that 99% of GPS users care more about altitude MSL (above Mean Sea...
1967
Tom Budlong
budlong
Apr 9, 2009 1:18 pm
The geoid is bumpy and wrinkly all over. The ellipsoid is mathematically trivial, in absolute and as compared to the geoid. Could Garmin really have a model of...
1968
tu206f
Apr 9, 2009 4:07 pm
... mathematically ... have ... non-speculative ... Of ... above ... level is ... will ... the...
1969
Dan Anderson
dananderson2
Apr 10, 2009 4:19 pm
Yes, Garmin has a model of the geoid in their firmware. Its resolution is another matter. The NMEA $GPGGA sentence gives the altitude above mean sea level and...
1970
Dan Anderson
dananderson2
Apr 10, 2009 4:19 pm
Yes, Garmin has a model of the geoid in their firmware. Its resolution is another matter. The NMEA $GPGGA sentence gives the altitude above mean sea level and...
1971
Simon Slavin
simonslavin
Apr 10, 2009 6:58 pm
... Can we test it empirically ? Find some place on earth where the various (four ?) values of 'elevation' are clearly different, some GPS units there, and...
1972
Michael A. Peters
funkyres
Apr 10, 2009 7:28 pm
... When I first got my garmin, the elevation at Lake Shasta was pretty close to the published elevation above sea level. But it jumped around - so it wasn't...
1973
Dan Anderson
dananderson2
Apr 10, 2009 9:50 pm
... 1. The value in the GPGGA sentence is the altitude above mean sea level by the NMEA specification; otherwise, a company is in violation (I'm not saying...
1974
Paul Tomblin
canoe
Apr 10, 2009 9:56 pm
On Fri, Apr 10, 2009 at 2:58 PM, Simon Slavin ... It's too bad my WAAS-capable Garmin 296 got stolen. The elevation on a WAAS GPS is much more reliable than...
1975
Simon Slavin
simonslavin
Apr 10, 2009 11:11 pm
... Very interesting. Does everyone agree that it's most reasonable for a GPS unit to calculate and log height-above-geoid ? Or does that strike anyone as...
1976
Michael A. Peters
funkyres
Apr 10, 2009 11:46 pm
... It is most reasonable for them to report the elevation most useful to the consumers who purchased the unit. I suspect for most people that is elevation...
1977
Jean-Claude REPETTO
jrepetto2001
Apr 11, 2009 4:55 pm
... But don't forget that the GPS system gives the height above the WGS84 ellipsoïd. To be able to provide the height above MSL to the user, the GPS units...
1978
nwoverlander
May 22, 2009 5:17 pm
In the schema, several items have a minOccurs=0 w/ no maxOccurs defined. Is maxOccurs to be interpreted as 1 or unbounded? We'd like to be able to define...
1979
Simon Slavin
simonslavin
May 22, 2009 9:03 pm
... Technically, this would indicate that you can have as many as you like. If you as suspicious about how this might apply to the item you're looking at,...
1980
Craig Miller
nwoverlander
May 22, 2009 9:28 pm
The schema element in question is: <xsd:element name="sym"; type="xsd:string" minOccurs="0"> <xsd:annotation> <xsd:documentation> Text of GPS symbol name. For...
1981
magnells
May 22, 2009 9:31 pm
... 1 is the default if the minOccurs component is not explicitly defined. steve magnell...
1982
Dan Foster
topografix
May 22, 2009 10:15 pm
Hello, ... http://www.topografix.com/GPX/1/1/gpx.xsd If you look at other element definitions in the GPX schema, you'll see that elements that can be repeated...
1983
gpsanimator
May 24, 2009 11:47 am
I'm getting an unexpected run-time error: "Unable to generate a temporary class (result=1). error CS0030: Cannot convert type 'demo3.gpxTrkTrksegTrkpt[]' to...
1984
Craig Miller
nwoverlander
May 25, 2009 2:31 pm
Thanks for the replies. My question was answered. The default if not specified is 1. Craig ... From: "Dan Foster" <egroups@...> Sent: Friday, May...
