Week 4 Flashcards
(11 cards)
What are the two fundamental types of angles in surveying?
Horizontal and vertical angles.
What is the use of vertical angles in surveying?
To determine the elevation of points and distances.
What is the purpose of horizontal angles in surveying?
To obtain direction and set out points.
What is the first step in setting up a total station?
Position the tripod over the survey station as level and well-centred as possible.
What is the purpose of the laser plummet in setting up a total station?
To centre the instrument exactly on the survey point.
How is the instrument levelled after being approximately centred?
By using the tripod legs and footscrews.
What is a double-face observation in measuring horizontal angles?
It involves taking readings from both face left (FL) and face right (FR) positions to minimise systematic errors.
What should the readings from sighting at a target on Face Left and Face Right differ by for horizontal angles?
180 degrees.
What should the readings from sighting at a target on Face Left and Face Right sum to for vertical angles?
360 degrees.
What are the three types of errors in angle measurements?
Gross errors, random errors, and systematic errors.
How can gross and random errors be minimised in angle measurements?
By taking repeated measurements.
