GPS and Survey

Question 1

GPS

Answer 1

Global Positioning System

Question 2

In Situ Data

Answer 2

are collected on the ground by a human being/special data collection instruments.

Question 3

Important characteristic of in situ datasets

Answer 3

You identify where each measurement was collected in geographic space.

Question 4

GNSS

Answer 4

Global Navigation Satellite Systems

Question 5

Important Applications of GPs (5)

Answer 5

• determining your exact location anywhere on the surface of the Earth
• Having the GIS network software identify the optimum route to a desired location.
• the use of GPS onboard an aircraft in support of the collection of digital aerial photography, LiDAR, or other types of remote sensor data.
• The GPS determines the x, y, and z position of the aircraft at the exact instant that an aerial photograph is taken or a LiDAR pulse of laser energy is emitted or received.
• information from airborne GPS receivers is used on commercial aircraft to constantly transmit the plane’s position to air-traffic controllers and to help the pilot land the plane

Question 6

FIVE examples of modern uses for GPS

Answer 6

• crowd sourcing
• Precision agriculture
• collecting GPS points
• accurate terrestrial land surveying
• using GPS and GIS to find the optimum route to a location

Question 7

How many satellites are necessary to provide full GPS coverage of the Earth?

Answer 7

24

4 placed in 6 orbits, 60° apart

Question 8

Three segments of a GPS

Answer 8

SPACE segment

CONTROL segment

USER segment

Question 9

Space Segment

Answer 9

24 satellites orbiting the earth, with 4 place in 6 orbits, 60°apart.

Question 10

Control Segment

Answer 10

Control to launch, maintain and constantly determine location of satellites.

• atomic clock

Question 11

User segment

Answer 11

People on the ground us GPS receivers to communicate with the GPS satellites to obtain continuous, accurate, worldwide, all-weather x,y,z position.

Question 12

Crowd sourcing

Answer 12

the act of outsourcing tasks traditionally performed by an employee or contracter, to an undefined, large group of people or community

Question 13

GPS and precision agriculture

Answer 13

GPS helps to control special tractors and farm implements during land preparation, planting, fetilization and harvesting

Question 14

why might you collect GPS points

Answer 14

To document the exact location of the route you have taken/compute the speed that you travelled the route

Question 15

GPS receivers are composed of:

Answer 15

AN ANTENNA

CENTRAL PROCESSING UNITY

ATOMIC CLOCK