On Wed, Jan 26, 2011 at 07:07:33PM +0000, Andrew Atkinson wrote:
The problem encountered is it works on the units of zero as horizontal and works mathematically, so -10 in caver speak is 350 in total station.
When this it put into therion (and by association I assume survex) you get an out of range error.
gradient reading out of range -- 359
Actually Survex will issue a warning but process this correctly (i.e. as if you'd written -1).
Okay I have solved this by converting all the down ones, but it would be good if Therion could use this convention. maybe generally giving a warning that can be suppressed for individual centrelines as a real icing feature?
Perhaps generalising this a bit would be more useful - we could allow the range of valid readings for any instrument to be specified. For your total station you'd put 0 to 360 (or is it 0 to 90 and 270 to 360?) But also if your tape is 30m long, then any reading above 30m is suspect. Distos seem to have a minimum range (about 33cm for mine it seems) as well as a maximum (200m apparently, though you might want to set the warning limit to something lower there). Cheers, Olly