Latitude and Longitude Video

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Presentation transcript:

Latitude and Longitude Video http://geography.about.com/video/Latitude-and-Longitude.htm

Modern Day Mapping!

Remote Sensing: Monitoring the Earth’s surface from a distance. Urban sprawl, drought, agriculture, flooding, weather, etc. Ex: Satellite, weather balloon, aircraft

GIS Geographic Information System Why have 8 maps when you can combine them into one (with layers)!

A GIS “Mash-Up” (data+mapping) ctabustracker.com

Global Positioning System (GPS) Military Technology ($12 billion) turned civilian Toy?

A Constellation of 27 Satellites (24+3 extra)

To simplify this lets try 2-D Triangulation first. A GPS Receiver’s job is to: locate satellites... figure out how far away it is from each satellite... and then determine its own position using triangulation (actually trilateration). To simplify this lets try 2-D Triangulation first.

Assume you are lost, but someone tells you that you are 625 miles from Boise, Idaho.

Lets say someone else tells you that you are 690 miles from Minneapolis. Good News!!! You must be at one of the two intersection points!

You’ve been Triangulated! Now if a third person tells you that you are 615 miles from Tuscon, Arizona... You are in Denver! You’ve been Triangulated!

3 D Triangulation = Uses spheres not circles.

How does a GPS determine distance? Satellite with atomic clock sends time stamped signal. GPS receiver determines amount of time traveled. Multiply time by the speed of light and get distance.

The Main Uses of GPS Locating (Where am I?) Navigating (Where am I going?) Tracking (Where is my truck/package?) Mapping (Where is everything else?) http://abcnews.go.com/GMA/video/google-track-criminals-11459424

Is It Perfect? Selective Availability (error of 100 meters) SA turned off in may 2000 (15 meters) (thanks to President Clinton!) http://www.gps.gov/systems/gps/modernization/sa/ With WAAS (3 meters).