Where am I?

1
Where am I?

• Using a GPS receiver
• to determine your location.

2
Global Positioning System

• Inexpensive handheld GPS receivers
• Signals transmitted by orbiting satellites
• Users position is measured with great accuracy
• Position result is reported as a geographic
  coordinate

3
Geographic Coordinates

• A GPS receiver is not much use unless you
  understand the result.
• Geographic Coordinates are a numeric
  representation of position on (or near) the
  earths surface.
• There are many different systems of geographic
  coordinates.

4
Geographic Coordinate Systems

• Latitude / Longitude
• Universal Transverse Mercator (UTM)
• Others
• State Plane
• Military Grid Reference System
• British Grid
• Maidenhead
• and many, many more.

5

• UTM
• Universal Transverse Mercator
• Coordinates

UTM Exercise Locating Grids on USGS Maps
6

• This 1km square is located at706km E 4344km N
• Usually we need to be a bit more precise about a
  location!

7
Using UTM is Easy

• Take a look at the UTM Practice Map handout.
• Can you quickly determine what map feature is at
  706.6 km E 4345.3 km N

8
100m square example
9
(No Transcript)
10
(No Transcript)
11
Using a distance scale, marked in meters, to
measure UTM coordinates
12
UTM Display on a GPS Receiver
13
Reporting your position inUTM kilometers
14
UTM Coordinate Markingson USGS Topographic Maps
15
This is a Township Range Section, NOT a UTM
Grid
16
Plotting and Reading UTMClassroom Exercise