first order survey

English translation: first order survey

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:first order survey
Selected answer:first order survey
Entered by: mediamatrix (X)

00:37 Oct 29, 2008
English language (monolingual) [Non-PRO]
Tech/Engineering - Surveying / benchmaks
English term or phrase: first order survey
What is a "first order" survey, which establish a monument bench mark, as compared to other less accurate surveys?
Jack Forristel
first order survey
Explanation:
As you suggest in your own question, 'first order' refers to the highest level of accuracy achieved in a surveying system. The actual accuracy corresponding to 'first order' depends on the standards that are adopted.

For example, the "US Office of Land Surveys" standard http://www.dot.ca.gov/hq/row/landsurveys/SurveysManual/Land_... defines the following 'orders':

"The following vertical accuracy standards will replace the requirements shown in figure 5-1:
First order: f = +/- 0.02(sqrt(M))
Second order: f = +/- .035(sqrt(M))
Third order: f = +/- .05(sqrt(M))

These reflect the closure between established control where f is the maximum misclosure in feet and M is the distance in miles."

In general, first order reference points are surveyed using the best-available technology, to provide a highly-accurate basic grid within which more-general positional data can be established.
Selected response from:

Jennifer Levey
Chile
Local time: 13:30
Grading comment
Most informative. Thank you.
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
4first order survey
Jennifer Levey


  

Answers


34 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
first order survey


Explanation:
As you suggest in your own question, 'first order' refers to the highest level of accuracy achieved in a surveying system. The actual accuracy corresponding to 'first order' depends on the standards that are adopted.

For example, the "US Office of Land Surveys" standard http://www.dot.ca.gov/hq/row/landsurveys/SurveysManual/Land_... defines the following 'orders':

"The following vertical accuracy standards will replace the requirements shown in figure 5-1:
First order: f = +/- 0.02(sqrt(M))
Second order: f = +/- .035(sqrt(M))
Third order: f = +/- .05(sqrt(M))

These reflect the closure between established control where f is the maximum misclosure in feet and M is the distance in miles."

In general, first order reference points are surveyed using the best-available technology, to provide a highly-accurate basic grid within which more-general positional data can be established.

Jennifer Levey
Chile
Local time: 13:30
Native speaker of: Native in EnglishEnglish
Grading comment
Most informative. Thank you.
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