GPS for Dummies.pdf - Engineering Surveyor

320Part IV: Using Web-hosted Mapping Servicesthat works the same way. Click a compass direction to scroll the map; forexample, click E (for east) to scroll the map to the right.Displaying a TerraServer-USA topographic mapIn addition to displaying aerial photos, TerraServer-USA also can show aUSGS topographic map of the same area that the aerial photo displays. (SeeFigure 20-2 for a topographic map of the area around the Space Needle.) To display a map: From the View drop-down list (to the left of the aerialphoto and above the compass), select Topo Map. A topographic map inroughly the same scale as the aerial photo is displayed. To display an aerial photo: To return to the aerial photo image, selectAerial Photo from the View drop-down list.TerraServer-USA is starting to provide high-resolution, color aerial photos ofcertain large metropolitan areas in the United States. If these images are availablefor the area you’re viewing, Urban Areas will appear in the View dropdownlist. Select Urban Areas in the list to display a color photo.Figure 20-2:A Terra-Server-USAtopographicmap ofdowntownSeattle,Washington.