GNSS and Total Station Theory Flashcards
(20 cards)
Total Stations are straight forward, applying their trigonometric results to some sort of_________ system.
Cartesian coordinate system
Cartesian coordinate system
organizes data on an essentially flat plane
When the total station is set up by itself, we often note the starting location on the grid as_______.
0-0-0
Local grid
Independent to the instrument and has nothing in common with any others nearby (0-0-0 starting point)
By leaving the starting position at 0-0-0, this places the device at the_______ of the grid, where it records evidence positions accordingly.
center
Each scan of a laser scanner creates a local grid________.
Underneath it
When the scans are later linked together (registered), each scan will assume the______ coordinate system created by the______.
SAME; First
When properly registered, all scans assume the “______________________” of the first. However, they still do not match grids of other instruments at the scene.
Coordinate DNA
GNSS systems are unique and all operate with a common grid known as what?
World Geodetic System (WGS)
World Geodetic System (WGS)
Standard grid encompasses the Earth and is periodically updated to ensure accuracy
T/F: Unlike the grid used by scanners or total stations, the WGS grid is shared by ALL GNSS receivers– no matter where you are.
True
The WGS is limited on the precision it can offer, so surveyors have developed a system to provide better resolution and is specific to the area being mapped. What is this system called?
State Plane Coordinate System
State Plane Coordinate System
Divides North America into smaller grid coordinate systems, providing more precise measurements (since it focuses on specific areas)
Most states are divided into______ or______ grid systems. These account for the__________ of the Earth in relation to the shape of the state.
two or more; curvature
State plane coordinate systems will always report_______ coordinate values.
Positive
When using_______ Capture Software with your GNSS device, the default grid system is 0-0-0 or a___________. This is identical to what the total station would use.
Trimble; local grid
Even though WGS coordinates are being collected in the background, your coordinate values will be displayed in__________ within your point list.
local grid
When your measuring is complete, all coordinates will be reported in the original local grid (0-0-0) values. Trimble Capture allows you to export those local values to the proper___________________ system numbers.
State plane coordinate
Local grid= WGS coordinates—> State Plane Coordinates.
True
Exporting values will NOT change the coordinates already in Capture; it only produces a .CVS file with the_________ values.
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