Older Posted August 24, 2010 Share How do Garmin and Polar etc. determine elevation? Link to comment Share on other sites More sharing options...
stewie911 Posted August 24, 2010 Share Barometric Link to comment Share on other sites More sharing options...
AndreZA Posted August 24, 2010 Share I want to know why after a ride starting and finishing at the same spot that the ascending and descending figures don't match. Surely if you ride downhill 200m you need to climb 200m. Link to comment Share on other sites More sharing options...
Tumbleweed Posted August 24, 2010 Share I want to know why after a ride starting and finishing at the same spot that the ascending and descending figures don't match. Surely if you ride downhill 200m you need to climb 200m. How far out is it usually? Link to comment Share on other sites More sharing options...
AndreZA Posted August 24, 2010 Share How far out is it usually? in the tens of meters. Link to comment Share on other sites More sharing options...
Tumbleweed Posted August 24, 2010 Share in the tens of meters. I found this when I first clicked on this thread: http://gpsinformation.net/main/altitude.htm Link to comment Share on other sites More sharing options...
Yang Posted August 24, 2010 Share Where I ride is as flat as a snooker table, there and back ride of 33,5km as a speed trial. But my Polar indicates altitude gains of from 0 to 50m on different days. I think its got to do with the temperature variance during the ride affecting the barometric pressure, which is how the Polar measures altitude. Link to comment Share on other sites More sharing options...
Delgado Posted August 24, 2010 Share I believe Jacques Kallis is brilliant at determining this!!! Link to comment Share on other sites More sharing options...
DirtyFrank Posted August 24, 2010 Share How far out is it usually? My Polar CS600 always under reads by 10-15% when compared to GPS units. This is probably due to the recording interval and the relatively slow adjustment cycle of the barometric units. I am sure that GPS units are more accurate. Link to comment Share on other sites More sharing options...
Mellow Posted August 24, 2010 Share I want to know why after a ride starting and finishing at the same spot that the ascending and descending figures don't match. Surely if you ride downhill 200m you need to climb 200m. temperature changes Link to comment Share on other sites More sharing options...
scotty Posted August 24, 2010 Share Kinda like yesterdays indoor stationary ride, according to my Garmin i had 14m ascent and 17m descent. Link to comment Share on other sites More sharing options...
1hill@aTime Posted August 24, 2010 Share Kinda like yesterdays indoor stationary ride, according to my Garmin i had 14m ascent and 17m descent. do you have wooden floors Link to comment Share on other sites More sharing options...
scotty Posted August 24, 2010 Share Nope, tiled floors Hilly1. Could be my house is sinking though, i started on 1624m and finished on 1621m Link to comment Share on other sites More sharing options...
1hill@aTime Posted August 24, 2010 Share Nope, tiled floors Hilly1. Could be my house is sinking though, i started on 1624m and finished on 1621m It's global warming, *grabs tin foil beeny* Link to comment Share on other sites More sharing options...
andrewc Posted August 24, 2010 Share Garmin Connect has an Elevation Corrections option for each training session that you upload. I ride a loop on Manning Road and the elevation at the same points gradually increase (generally) during the training session: Enabling Elevation Corrections fixes the elevation data: Might be handy information for the Garmin owners out there. Cheers, Andrew Link to comment Share on other sites More sharing options...
Tumbleweed Posted August 24, 2010 Share I believe Jacques Kallis is brilliant at determining this!!! That's a classic story… Link to comment Share on other sites More sharing options...
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