gps basics 2007 ncsta institute. interesting revelations en route to teaching the use of gps...
TRANSCRIPT
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GPS Basics
2007 NCSTA Institute
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Interesting revelations en route to teaching the use of GPS receivers
to middle schoolers:
1. Most students (and a good number of adults) do not have a good grasp of the concepts of latitude and longitude.
2. Following a GPS without at least some map-reading ability can be trouble.
3. Many folks have an interesting concept of how GPS units work.
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Three Questions to Build From…
• Where were you born?
• Where was your most favorite vacation?
• Where is the furthest away from home you
have ever been?
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Why Latitude & Longitude?(Location. Location. Location.)
• If we wanted to meet in Barcelona for a cold beverage, how best could we pinpoint a
location? How about in NYC? Kansas?
• If we wanted to plot attributes (rainfall amounts, elevation, land use) onto a GIS map, how best
could we pinpoint each location?
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Latitude & Longitude create a grid system which gives every physical location its own specific name
or marker.
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Latitude & Longitude create a grid system which gives every physical location its own specific name
or marker.
As Long As You Include the Direction!!
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The Dilemma with Degrees
36 Degrees North, 80 Degrees West
“Hey! Where are you!”
“I’m in Virginia. Where are you?”
“High Point.”
“Oh…”
*With Degrees only, we can be precise to 69 miles.
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The Solution
• Degrees, Minutes, Seconds36° 23’ 19”
OR
• Degrees, Minutes, Decimals36° 23.317’
*With 1000ths of Minute, we can be precise to a matter of meters.
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How does this “System” work?
With solid signal from one satellite, the receiver knows it is a given distance from the satellite, but it does not know what direction….
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With solid signal from two satellites, the receiver knows it can only be at those locations that meet both distance criteria... (intersections of circles)
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So with solid signal from three satellites, our receiver can pinpoint its location and give us an accurate latitude & longitude….
…. Right????
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Darn Topography
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Contact Info
• Feel Free to Contact Me with any Questions
Kevin MooreBetsy-Jeff Penn 4H Education Center
www.bjpenn4h.org