GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW) | ||||||
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00:37 Oct 29, 2008 |
English language (monolingual) [Non-PRO] Tech/Engineering - Surveying / benchmaks | ||||
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| Selected response from: Jennifer Levey Chile Local time: 13:30 | |||
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SUMMARY OF ALL EXPLANATIONS PROVIDED | ||||
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4 | first order survey |
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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. |
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