Reza Survey Book, Example 2.2

[passpepasspe]

I was wondering if someone can help me understand why in example 2.2 in Reza's book, the temperature correction is being added, even though, when you compute the error due to temperature you get a (-).0709 feet as answer, so then why is it being added into the answer rather than subtracting.

 

[Silvamela]

I was wondering if someone can help me understand why in example 2.2 in Reza's book, the temperature correction is being added, even though, when you compute the error due to temperature you get a (-).0709 feet as answer, so then why is it being added into the answer rather than subtracting.

The temperature correction is added because this is a layout problem, not a measurement problem. For layout, the corrections are changing the sign.

 

[passpepasspe]

I was wondering if someone can help me understand why in example 2.2 in Reza's book, the temperature correction is being added, even though, when you compute the error due to temperature you get a (-).0709 feet as answer, so then why is it being added into the answer rather than subtracting.

The temperature correction is added because this is a layout problem, not a measurement problem. For layout, the corrections are changing the sign.

Thanks so much, but

layout problems have 2 rules,

so Rule No. 1 is Tape too long, subtract the correction

Rule No. 2, Tape too short, add the correction

since the tape is 100.05, which is tape too long, don't you subtract the correction??

So confusing.

 

[Silvamela]

I was wondering if someone can help me understand why in example 2.2 in Reza's book, the temperature correction is being added, even though, when you compute the error due to temperature you get a (-).0709 feet as answer, so then why is it being added into the answer rather than subtracting.

The temperature correction is added because this is a layout problem, not a measurement problem. For layout, the corrections are changing the sign.

Thanks so much, but

layout problems have 2 rules,

so Rule No. 1 is Tape too long, subtract the correction

Rule No. 2, Tape too short, add the correction

since the tape is 100.05, which is tape too long, don't you subtract the correction??

So confusing.

There are two corrections you need to make, both independently! One is for temperature and one is for the tape being too long, ie even at the standard 68F, the tape has been manufactured with defects measuring 100.05 ft instead of 100.00 ft. Thus you correct for both temperature and tape lenght and add/substract correction acording to the 2 rules you said above.