May 30, 2007 Citizen Science Training Workshop Lesson 2: Introduction to GPS The Training Workshop Title 2007 Annual Meeting Location, CO Your Name – Your Title Natural Resource Ecology Laboratory Colorado State University

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Coordinate Systems Geographic (Latitude/Longitude) Prime Meridian = 0 o Longitude Equator = 0 o Latitude Universal Tranverse Mercator (UTM) 60 Zones, 6 o wide 20 Sections, 8 o tall

Geographic Coordinate System Prime Meridian Equator Latitude = 32 7’ 11.3” N Longitude = ’ 48.5” W

Universal Tranverse Mercator

Example: Universal Tranverse Mercator Where does your state lie?

Example: Universal Tranverse Mercator Where does the point lie? Answer: 4,696,750 meters north (Northing) 471,800 meters east (Easting)

Datums Earth not a perfect sphere! Datum defines spheroid used Common examples North American Datum of 1927 (NAD27) North American Datum of 1983 (NAD83) World Geodetic System of 1984 (WGS84)

Datums Local Referencing Datum

Datums Global Referencing Datum

Definitions Global Positioning System (GPS) hand-held receiver determines position (geographic, UTM)

How does GPS work? Utilizes a network of 24 satellites that transmit precise microwave signals enables a GPS receiver to determine its location, speed and direction

How do GPS units work? Every point on circle is a possible receiver location Satellite 1 Location Receiver Location? Receiver Location

How do GPS units work? Satellite 1 Location Satellite 2 Location ? ?

How do GPS units work? Satellite 1 Location Satellite 2 Location Satellite 3 Location Known Receiver Location

GPS Data Uses Navigation Where am I? How do I get from point x to point y? Mapping Define a point (e.g., campground, plot location) Define a line (e.g., hiking trail, river) Define a polygon (e.g., lake, area covered by weed) Point Line Polygon

Geographic Information Systems (GIS) Definition information systems that manage, manipulate, and analyze spatial data

August 9, 2007 For more information contact: Your Name Contact Information Congratulations! You have completed Lesson 2.