GPS for Dummies.pdf - Engineering Surveyor

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234Part III: Digital Mapping on Your ComputerUSAPhotoMaps has two display modes: aerial photo and topographic map.When you download data to fill in the gray squares, only data <strong>for</strong> the particularmode that you’re in is downloaded. For example, if you’re viewing an aerialphoto, only new aerial photo data is downloaded.Zooming in and outYou can zoom in and out on an aerial photo or map to see more detail or geta larger, big picture view. For zooming, use these keys: Zoom in: Press Page Down or the plus (+) key. Zoom out: Press Page Up or the minus/dash (–) key.The current zoom level appears in the window title bar, so you always knowhow far you’ve zoomed in or out.The zoom level on the window title bar displays the resolution of the image. Ifthe resolution is 4 meters-per-pixel, each pixel (picture element) onscreen representsan object 4 meters in size. (Remember that a meter is roughly a yard.)Smaller numbers mean higher resolution and greater detail. For example, 1meter-per-pixel resolution means that you can distinguish objects on the groundthat are one meter in size. Figure 14-5 shows a 2 meter-per-pixel aerial photo.How far you can zoom in and out on an image depends on what type of mapyou’re viewing. Topographic maps: 4, 8, 16, or 32 meters-per-pixel Aerial photos: 1, 2, 4, 8, 16, 32, or 64 meters-per-pixelIf you’re switching back and <strong>for</strong>th between aerial photos and topographicmaps, use either a 4 or an 8 meters-per-pixel zoom level. This will give youclose to a one-to-one size representation of features on the aerial photo andthe topographic map.Enhancing contrastOne of the things you’ll notice as you start to view aerial photos is that thecontrast might be lighter or darker with certain images. This has to do withthe amount of sunlight when the photo was taken and the background colorof the terrain.
Chapter 14: From the Air with USAPhotoMaps235Figure 14-5:The aerialphotographof Seattleviewed at2 meterper-pixelresolution.To enhance less-than-optimal contrast, USAPhotoMaps has a nifty featurethat lets you adjust the contrast of the photos displayed onscreen by eitherlightening or darkening them. This can really enhance detail in a photo.You can control the contrast of a photo by using these keys: Lighten: Press the B key. Darken: Press the D key.You can also set contrast by selecting Brightness from the View menu, includingrestoring the contrast back to its default setting.Entering textAfter you have an aerial photo displayed, you can add text labels to differentfeatures when the image is displayed at the 1- or 2-meter zoom levels. To entera text label
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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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xviGPS For DummiesOther Street Navi
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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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16Part I: All About Digital MapsBef
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In this part . . .GPS stands for Gl
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50 Part II: All About GPS A short h
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52Part II: All About GPSFigure 3-2:
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54Part II: All About GPSEphemerisEp
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56Part II: All About GPSCommercial
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58Part II: All About GPSAlthough su
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62Part II: All About GPSElectronic
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64Part II: All About GPSUnder certa
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66Part II: All About GPSInternal me
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68Part II: All About GPSThe Future
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70 Part II: All About GPS Land navi
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74Part II: All About GPSAll GPS rec
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78 Part II: All About GPS receiver.
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80Part II: All About GPSIf you turn
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84Part II: All About GPSSelecting a
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88Part II: All About GPSservices al
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90Part II: All About GPSGPS receive
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96Part II: All About GPSIn order to
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98Part II: All About GPSTry moving
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106Part II: All About GPSPDA advant
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110Part II: All About GPSMouse GPS
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112Part II: All About GPSFigure 6-2
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114Part II: All About GPSthen uploa
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118Part II: All About GPSaccurate t
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120Part II: All About GPSgear, and
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122Part II: All About GPSThat’s t
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124Part II: All About GPSJust click
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128 Part II: All About GPS Geocachi
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130Part II: All About GPSFigure 7-5
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132Part II: All About GPSGeoJargon:
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134Part II: All About GPS Tupperwar
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136Part II: All About GPSTaking geo
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138 Part II: All About GPS The Oreg
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140Part II: All About GPS Cache In,
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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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334Part V: The Part of TensCurrent
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344Part V: The Part of Tens Better
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346Part V: The Part of TensHere are
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348Part V: The Part of TensThe main
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350Part V: The Part of TensFigure 2
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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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356Part V: The Part of TensIf you b
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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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368GPS For DummiesMapTech Terrain N
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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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