[talk-au] Where to use sat image rather than GPS input?

Frank Sundowner61 at optusnet.com.au
Fri Apr 4 00:22:56 UTC 2014


Context: Jenolan Caves, there is a tunnel that connects two valleys. The 
GPS information contains errors that is enlarged by the reduced view of 
GPS satellites and by multipath reflections caused by the valley and the 
steep hillside that the tunnel passes through.

In some places I contend that the sat imagery is to be preferred as more 
precise/detailed compared to collected GPS data.

This occurs where the GPS data is either too widely spaced (limited 
number of samples) or compromised by reflections/reduced view of 
satellites.


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