GPS for Dummies.pdf - Engineering Surveyor

228Part III: Digital Mapping on Your Computer Only a relatively small geographic area can be displayed. You can’t edit downloaded photos and maps. GPS receiver data can’t be used with the photos and maps.You can read more about TerraServer-USA in the sidebar, “TerraServer-USAlimitations.”To address these issues, several developers have created programs that downloadTerraServer-USA aerial photos and maps so you can put the data to moreversatile use. Instead of relying on a Web browser, you use these standaloneprograms — like USAPhotoMaps — to create scrollable, aerial photos of justabout anywhere in the United States that can be customized and saved andoptionally overlaid with GPS data.Discovering USAPhotoMaps FeaturesUSAPhotoMaps is an aerial photo and map program written by Doug Cox, whois a retired airline pilot turned Windows programmer. USAPhotoMaps is elegantlysmall and simple to use, with a number of powerful features. Use it to Display USGS aerial photographs and topographic maps. Zoom in and out on map features. Support user-defined text labels. Save user-selected areas as JPG format files. Interface with a GPS receiver for real-time tracking. Import and export GPS waypoints, routes, and tracks.USAPhotoMaps has an extensive online help file.Downloading Aerial PhotographsThe first time you run USAPhotoMaps, a dialog box appears that promptsyou to create a new map. You need to enter the following: What you want to name the map. The coordinates of the area you’re interested in viewing. The coordinatescan be in either• Latitude and longitude• Universal Transverse Mercator (UTM)