Re: LTI TruPoint 300
Posted: Fri Jun 19, 2020 6:54 am
ENTS,
Of late, I've resumed testing the TruPoint 300 as I promised LTI I would do. The attachment shows the TruPoint's accuracy for trunk diameter measurements as of 10 trials. As the number of trials expands, I don't expect the average difference between caliper and TruPoint measurements to stay so close as now, but I will be surprised if the average difference exceeds 0.25 inches for trunks with diameters up to 36 inches - the limits of my calipers for comparison.
To use the TruPoint for diameter measuring to the best result, several internal functions must be used: (1) Missing Line routine to measure any trunk lean in degrees from either the horizontal or vertical axes, (2) the distance from the TruPoint to the middle of the trunk on the diameter line being measured, and (3) the Diameter routine, itself. I've included an adjustment if the instrument is too close to the trunk so that the edges of the trunk are not visible.
I've also created an Excel workbook to do a complete trunk modeling using the TruPoint 300. I will need to modify it a bit to incorporate the adjustment for being too close, but it is basically finished. Now to put it to use.
Oh yes, LTI has reduced the TruPoint's price to $1,300. BTW, it is advertised as a total station instrument. It is also called a mini-surveying station. Its class 2, phase-based laser has a rated accuracy of +/-1.0 mm to a clear target, and +/-2.0 with less favorable visibility. With favorable conditions the range is to 1,000 feet. For trunk measurements, the working range is likely to be from about 25 to 150 feet.
Bob
Of late, I've resumed testing the TruPoint 300 as I promised LTI I would do. The attachment shows the TruPoint's accuracy for trunk diameter measurements as of 10 trials. As the number of trials expands, I don't expect the average difference between caliper and TruPoint measurements to stay so close as now, but I will be surprised if the average difference exceeds 0.25 inches for trunks with diameters up to 36 inches - the limits of my calipers for comparison.
To use the TruPoint for diameter measuring to the best result, several internal functions must be used: (1) Missing Line routine to measure any trunk lean in degrees from either the horizontal or vertical axes, (2) the distance from the TruPoint to the middle of the trunk on the diameter line being measured, and (3) the Diameter routine, itself. I've included an adjustment if the instrument is too close to the trunk so that the edges of the trunk are not visible.
I've also created an Excel workbook to do a complete trunk modeling using the TruPoint 300. I will need to modify it a bit to incorporate the adjustment for being too close, but it is basically finished. Now to put it to use.
Oh yes, LTI has reduced the TruPoint's price to $1,300. BTW, it is advertised as a total station instrument. It is also called a mini-surveying station. Its class 2, phase-based laser has a rated accuracy of +/-1.0 mm to a clear target, and +/-2.0 with less favorable visibility. With favorable conditions the range is to 1,000 feet. For trunk measurements, the working range is likely to be from about 25 to 150 feet.
Bob