GPS for Dummies.pdf - Engineering Surveyor

xiiGPS For DummiesWorking with Map Coordinate Systems .....................................................28Latitude/longitude ...............................................................................29Universal Transverse Mercator (UTM) .............................................32Township and Range ...........................................................................34Measuring Map Scales ..................................................................................36Looking at Map Symbols ..............................................................................38Digital Map Data ............................................................................................39TIGER ....................................................................................................39Digital Line Graph (DLG) ....................................................................40Elevation data ......................................................................................42Digital Raster Graphics (DRG) ...........................................................42Digital Orthophoto Quadrangle (DOQ) ............................................44Satellite data .........................................................................................44Part II: All About GPS ................................................47Chapter 3: GPS Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49What Is GPS? ..................................................................................................49How GPS Works .............................................................................................50Eyeing satellites ...................................................................................51GPS radio signals .................................................................................52Covering ground stations ...................................................................53GPS receivers .......................................................................................53How accurate is a GPS receiver? .......................................................56Information from GPS Receivers .................................................................58GPS Receiver Features ..................................................................................59Display and output ..............................................................................59Alarms ...................................................................................................60Built-in maps ........................................................................................60Electronic compass .............................................................................62Altimeter ...............................................................................................62Increasing accuracy ............................................................................63WAAS .....................................................................................................63Differential GPS ....................................................................................64Antennas ...............................................................................................64Internal memory ..................................................................................66External storage ...................................................................................66Accessory programs ...........................................................................66User interface modes ..........................................................................66Synthesized voice ................................................................................67The Future of GPS .........................................................................................68