GPS and GIS Flashcards

global positioning system

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

27 (24 are active, 3 are backups)

<p>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.</p> Signup and view all the answers

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

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

<p>detect the location of more satellites</p> Signup and view all the answers

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

<p>uses GIS software to create environmental maps and analyze data</p> Signup and view all the answers

<p>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.</p> Signup and view all the answers

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

<p>With maps, environmental problems can be better visualized</p> Signup and view all the answers