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GEODETIC SURVEYING

That type of surveying which takes into account the shape of the earth is defined as geodetic surveying. All surveys employing the principles of geodesy are of high precision and generally extend over large areas. Where the area involved is not great the required precision may be obtained by assuming that the earth is a perfect sphere. Where the area is large, as for a country, the true spheroidal shape of the earth is considered. In the United States such surveys have been conducted principally by the U.S. Coast and Geodetic Survey and the U.S. Geological Survey. Surveys conducted under the assumption that the earth is a perfect sphere have been completed by such large cities as Washington, Baltimore, Chicago.

Though only a few engineers and surveyors are employed in geodetic work, the data of the various geodetic surveys are of great importance.

As a rule, any of the national development project is usually preceded by thorough geodetic and topographic work

6. Ответьте на вопросы:

1. Does geodetic surveying take into accounts the shape of the earth?

2. Are geodetic surveys of high precision?

3. Do they extend over large areas?

4. May the required precision be obtained by assuming that the earth is a perfect sphere?

5. Is the true spheroidal shape of the earth always considered?

6. Have such surveys been conducted by the US Geodetic Survey in the United States?

7. Are many surveyors employed in geodetic work?

8. Are the data of these surveys of great importance?

9. Are national development projects preceded by geodetic work?

10. Does topographic work precede national development projects?