On 4 Apr 2014, at 11:22 am, Frank <sundowne...@optusnet.com.au> wrote: > 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.
I’d agree that sat imagery is preferred - just be aware that the imagery will need to be aligned with GPS traces in less problematic areas (e.g. on top of hills). There may be some previously-submitted GPS traces in the area to compare with yours. Mark P.
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