I am trying to calculate the length of a GPX track. The original GPS data looks like this: 2014-04-25T19:20:39ZTrack 2014-04.57812014-04-25T19:59:24Z2.757.0236.594.02014-04-25T19:59:26Z2.57.02482422I imported the data into PostgreSQL/PostGIS. I think I see your problem.
How To Measure Distance In Gpx Tracks Free
You are grouping points (to make tracks) using gps.ogcfid, but that gives you a single point in each track. You need to group using gps.trackfid: SELECT gps.trackfid, tracks.name,STLengthSpheroid(STMakeLine(gps.wkbgeometry),'SPHEROID'WGS 84',6378137,263') AS tracklenFROM (SELECT trackfid, time, wkbgeometryFROM trackpointsORDER BY ogcfid, time)AS gps, tracksWHERE gps.trackfid = tracks.ogcfidGROUP BY gps.trackfid, tracks.nameORDER BY gps.trackfid;I've just tried this with a couple of my GPS tracks, and I get lengths consistent with those calculated by projecting into local coordinates.
Can easily determine the distance between 2 cities as well. Distance From: Distance To: Calculate Distance. Straight line distance: 0.0 miles, 0.0 kilometers (km), 0 feet, 0 meters. Driving distance: 0.0 miles, 0.0 kilometers (km), 0 feet, 0 meters. You can share or return to this by using the link below.
Runners may need to verify or determine the distance of a running track. Running tracks are oval-shaped and divided into individual lanes. The track is measured in meters based on the distance of the innermost lane, which is called lane one. Measuring the distance around the track is easy with a little preparation. Some devices measure the distance based on GPS, but using an old-fashioned measuring wheel provides the most accurate reading. Although measuring wheels are available in different sizes, medium-to-large wheels are the best for measuring a running track. Copyright ©2019Leaf Group Ltd.Use of this web site constitutes acceptance of the LIVESTRONG.COM,and.The material appearing on LIVESTRONG.COM is for educational use only.
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