GPS and GIS
What does GPS stand for? - answer global positioning system
What is GPS? - answer 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? - answer27 (24 are active, 3 are backups)
How does 2D trilateration work? - answer If you know the distances of three things from
where you are, you can draw circles whose raid represent the distances those things
are from you. You can then pinpoint your exact location as the location where the three
circles intersect.
How does 3D trilateration work? - answer3D trilateration is like 2D trilateration, but
instead of circles, there are intersecting spheres.
What two things do GPS receivers need to do in order to find a location? – answer GPS
receivers have to find at least four satellites above the receiver and calculate the
distance between the receiver and each satellite in order to find a location.
What do more accurate GPS units do? - answer detect the location of more satellites
Why is knowing how to use GIS important for someone interested in environmental
systems? - answerThere is a high demand to accurately map information in GIS.
Knowing how this system works can help you find a job.
What does a GIS specialist do? - answeruses GIS software to create environmental
maps and analyze data
What is trilateration? - answerA 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
What can GIS data do ? - answerthey can layer in data, such as population growth, air
pollution, and average tempreture changes
how do maps make things better? - answerWith maps, environmental problems can be
better visualized
What does GPS stand for? - answer global positioning system
What is GPS? - answer 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? - answer27 (24 are active, 3 are backups)
How does 2D trilateration work? - answer If you know the distances of three things from
where you are, you can draw circles whose raid represent the distances those things
are from you. You can then pinpoint your exact location as the location where the three
circles intersect.
How does 3D trilateration work? - answer3D trilateration is like 2D trilateration, but
instead of circles, there are intersecting spheres.
What two things do GPS receivers need to do in order to find a location? – answer GPS
receivers have to find at least four satellites above the receiver and calculate the
distance between the receiver and each satellite in order to find a location.
What do more accurate GPS units do? - answer detect the location of more satellites
Why is knowing how to use GIS important for someone interested in environmental
systems? - answerThere is a high demand to accurately map information in GIS.
Knowing how this system works can help you find a job.
What does a GIS specialist do? - answeruses GIS software to create environmental
maps and analyze data
What is trilateration? - answerA 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
What can GIS data do ? - answerthey can layer in data, such as population growth, air
pollution, and average tempreture changes
how do maps make things better? - answerWith maps, environmental problems can be
better visualized
