GPS for Dummies.pdf - Engineering Surveyor

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230Part III: Digital Mapping on Your ComputerFigure 14-1:Create anew maphere.Figure 14-2:USAPhoto-Maps aerialphotomosaic ofSeattle,Washington.
Chapter 14: From the Air with USAPhotoMaps231If you plan to use USAPhotoMaps to build an extensive aerial photo collection,a high-speed Internet connection will make your life much easier. Eachindividual aerial photo or topographic map image in the displayed mosaic isroughly 50–200K in size. (The actual size depends on how much unique terrainis shown in the image.) At 2 meters-per-pixel resolution, it takes 70 imagesto fill the screen of a 1024 x 768 monitor; that’s anywhere from 7–17MB of datato download.Getting the Most from Aerial PhotosAfter you have an aerial photo displayed, navigate inside the image. (Readthe preceding section for how to download and display an aerial photo.)USAPhotoMaps has a number of different commands to view and manipulatethe photo.The datum used for all TerraServer-USA maps is NAD 83. This is nearly identicalto the WGS 84 datum used as a default by GPS receivers. If you plan onusing your GPS receiver with USAPhotoMaps, be sure that the datum settingsmatch. (Read more about datums in Chapter 2.)The first thing you’ll notice is that when you move the mouse cursor aroundthe screen, map coordinates appear in the window title bar. This feature allowsyou to move the cursor over a feature that’s shown on the aerial photo andget its precise coordinates.You can change how you want the coordinates displayed from the View menu.Choose the Lat/Lon item and then specify whether you want the coordinatesshown in decimal degrees, degrees and decimal minutes, degrees/minutes/seconds, or UTM formats.Press the X key to display a dialog box with the coordinates that the cursor iscurrently over. You can copy the coordinates from this dialog box and pastethem into another program.Switching between aerial photosand topographic mapsAfter you know where you are in a photo (see the preceding section), lookat the commands that you can use to move around. As I mention earlier,TerraServer-USA provides both aerial photos and USGS topographic maps,
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GPSFORDUMmIES‰
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GPS For Dummies ®Published byWiley
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Author’s AcknowledgmentsFirst off
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Contents at a GlanceIntroduction ..
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xiiGPS For DummiesWorking with Map
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xivGPS For DummiesChapter 7: Geocac
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xviiiGPS For DummiesReviewing Stree
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xxGPS For Dummies
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2 GPS For DummiesOver the past seve
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4 GPS For Dummies While most GPS re
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6 GPS For Dummieshints on printing
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8 GPS For Dummies
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In this part . . .While digital map
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12 Part I: All About Digital Maps M
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14Part I: All About Digital Mapsare
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90Part II: All About GPSGPS receive
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98Part II: All About GPSTry moving
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110Part II: All About GPSMouse GPS
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In this part . . .You get practical
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146Part III: Digital Mapping on You
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In this part . . .All Dummies books
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LAP PACE352Part V: The Part of Tens
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A number of personal GPS products a
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358GPS For DummiesAdventure Paper w
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360GPS For DummiesCOM port, 157-159
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362GPS For DummiesDescartes, René
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364GPS For Dummies• G •Galileo
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366GPS For DummiesGroundspeak geoca
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370GPS For Dummies• O •Odden’
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372GPS For Dummiesprinting (continu
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374GPS For Dummiesreceivertrack, tr
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376GPS For Dummiessection (Township
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378GPS For Dummies• T •Tagged I
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380GPS For Dummiestrack (continued)
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382GPS Navigation For Dummiesweathe
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A world of resources to help you gr
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Helping you expand your horizons an
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We take the mystery out of complica
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