What is difference between 1" and 5" total station survey instrumnet...?
Answer:
Modern total station instruments use electronics for determination of directions. Angles are determined as differences between directions. Angular precision (1" vs. 5") refers to the precision of a single pointing, so precision for an angle is 1" * SqRt(2), or 5" * SqRt(2), etc.
In general, higher precision instruments are more expensive. Many states have minimum standards for surveys that specify the required precision of survey instruments.
Relative to current uses and equipment, a 5" total station could be used for construction surveys or general purpose surveys where high precision is not required.
Most total stations sold today are 3" instruments, or better. A 5" instrument is probably an older instrument - it may require service.
my interpretation of this is that a 1" TSS is going to be accurate within 1" of the real elevation, whereas a 5" TSS is going to be accurate within 5".
To me, 5" is a ton... but I'm a civil engineer and we use TSS to monitor earth settlement and the elevation of pipe inlets and outlets where flow has to be achieved. I would splurge for the one that is the most accurate. There seems to be about a $900 difference, but really, a 5" accuracy threshold is useless for everything other than shooting the tops of fenceposts in some pasture somewhere.
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