GPS and GIS Flashcards

Questions and Answers

What does GPS stand for?

global positioning system

What is GPS?

a system of satellites orbiting the earth and transmitting distances from the location of the satellites to a receiver

How many satellites are in the GPS system?

27 (24 are active, 3 are backups)

How does 2D trilateration work?

If you know the distances of three things from where you are, you can draw circles whose radii represent the distances those things are from you. You can then pinpoint your exact location as the location where the three circles intersect. Signup and view all the answers

How does 3D trilateration work?

3D trilateration is like 2D trilateration, but instead of circles, there are intersecting spheres. Signup and view all the answers

What two things do GPS receivers need to do in order to find a location?

GPS receivers have to find at least four satellites above the receiver and calculate the distance between the receiver and each satellite. Signup and view all the answers

What do more accurate GPS units do?

detect the location of more satellites Signup and view all the answers

Why is knowing how to use GIS important for someone interested in environmental systems?

There is a high demand to accurately map information in GIS. Knowing how this system works can help you find a job. Signup and view all the answers

What does a GIS specialist do?

uses GIS software to create environmental maps and analyze data Signup and view all the answers

What is trilateration?

A GPS receiver locates 4 or more satellites, calculates the distance from each of the satellites, and uses that information to figure out its own location. Signup and view all the answers

What can GIS data do?

they can layer in data, such as population growth, air pollution, and average temperature changes Signup and view all the answers

How do maps make things better?

With maps, environmental problems can be better visualized Signup and view all the answers

Study Notes

GPS Overview

GPS stands for Global Positioning System, a technology for determining precise locations on Earth.
The system consists of 27 satellites, with 24 functioning satellites and 3 backups in orbit around the Earth.

Trilateration Techniques

2D trilateration uses distances from three satellites to draw intersecting circles, identifying the receiver's exact location.
3D trilateration extends this concept to three dimensions, where distance measurements from satellites create intersecting spheres.

GPS Functionality

GPS receivers need to connect with at least four satellites to accurately calculate their location by measuring the distance to each one.
More advanced GPS units can detect and utilize signals from a greater number of satellites, improving location accuracy.

GIS Importance and Application

Proficiency in GIS (Geographic Information Systems) is crucial for those interested in environmental studies due to the high demand for accurate mapping and data visualization in the field.
GIS specialists utilize software to create environmental maps and analyze various data-related aspects, crucial for environmental management and planning.

Data Utility and Visualization

GIS can layer various data types, such as population growth, air pollution levels, and temperature fluctuations, enhancing analysis capabilities.
Maps created through GIS improve the visualization of environmental issues, making complex data easier to understand and act upon.

Description

Test your knowledge on GPS terminology and concepts with these flashcards. Learn about the global positioning system, the number of satellites involved, and the trilateration process. Perfect for students and professionals interested in geographic information systems.