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Altitude data from GPS

 
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SteveTh
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Joined: Mar 02, 2004
Posts: 3

PostPosted: Thu Mar 04, 2004 2:37 pm    Post subject: Altitude data from GPS Reply with quote

Should the altitude data received from the GPS correlate with the altitude data given on on OS map or are they using different datums (is that the plural of datum??)
My Fortuna Clip-On seems to be consistently high by about 30.000m
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lbendlin
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Joined: 02/11/2002 22:41:59
Posts: 11878
Location: Massachusetts, USA

PostPosted: Thu Mar 04, 2004 3:20 pm    Post subject: Reply with quote

30 meters is pretty decent.. Don't forget that the VDOP is often higher than the HDOP. Additionally, somewhere here is a trhead sleeping that goes into great detail about how certain receiver firmware versions (for the SiRF II chipset) are calculating the altitude correction from the WGS84 wrongly - either they ignore it or they add it up the wrong way.
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Robin2
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Joined: Nov 24, 2003
Posts: 1441
Location: Swansea

PostPosted: Fri Mar 12, 2004 12:18 am    Post subject: Reply with quote

When I'm driving along the shore here in Swansea, CoPilot tells me that I am 400 ft above sea level!
Robin
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lbendlin
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PostPosted: Sat Mar 13, 2004 2:26 am    Post subject: Reply with quote

remember, it may not be CoPilot's fault. It just repeats what the GPS receiver is saying.
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SteveTh
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PostPosted: Fri Mar 19, 2004 3:00 pm    Post subject: Reply with quote

The Ordnance Survey National GPS Network at www.gps.gov.uk refer to a Coordinate Converter written by QuestWEB at www.qgsl.com.
When I input my GPS coordinates and height data the utility tranforms it to the Newlyn datum and it is then as we would expect it to be as shown on OS maps.
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