As briefly mentioned in another email, we are surveying a cave with a total station, due to the amount of metal, making compasses useless. The total station gives its readings in degrees:minutes:seconds, which is fine for therion, but not so good for PocketTopo (or it might be my ignorance.) 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 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? Andrew
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
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Andrew Atkinson -
Olly Betts