So personally, I'm extremely sceptical of the general validity of any orientation data that have been collected with smartphones - unless the user has documented their calibration procedure carefully, and that the calibration has not relied wholly of the device's own calibration. there's no obvious way of examining the device itself to see whether it's likely to be functioning correctly - you must have another device with which to compare it.even if we are very careful, the iPhones sometimes don't self-calibrate properly - so we always cross-check the iPhone against an analogue compass-clino before and after a measurement session.if we're not very rigorous in setting-up and calibrating the devices, we usually get randomly bad results.We've now taken many, many thousand measurements with iPhones that we believe are within acceptable precision.Once we're up and running, using an iPhone is much quicker than any analogue compass-clino we've used so ideal for taking large numbers of measurements from a single sampling site (e.g.We have managed to get good, repeatable results that are approximately as precise as a set of analogue compass-clinos (Silva liquid filled housings, double spirit-level, no electronics)."We have carried out quite a lot of systematic testing of the suitability of iPhones as compass-clinos for measuring geological planes - and we have experienced very mixed results. I'm sure that we will get reliable app/smartphone combination within a few years, but be careful in the meantime. You can sign up there to see the FieldMove Clino thread beginning on 27/8/14, but the gist of the widely held concerns is in the post below from Richard Jones at Geospatial research at Durham.
This is a regular topic of discussion on the Geotectonics discussion group at. This does a lot of good things, BUT you should be aware of possible errors. I keep being told that the complete answer to collecting field orientation data is a smartphone app such as FieldMove Clino.
Smartphone & Tablet Compass/Clinometer Apps Warning from Nigel Woodcock
0 kommentar(er)
