GPS for Dummies.pdf - Engineering Surveyor

Chapter 16: Going Three Dimensional with 3DEM263Creating a 3-D MapWhen you have the DEM data loaded into 3DEM, you can create three-dimensionalscenes of the area that’s displayed. It’s dangerous (and illegal) to ventureinside the Mount St. Helens crater in real life, but with 3DEM, you can get abetter idea of what the crater looks like from inside.Defining the display areaTo define the area to display in 3-D, first look on the map for a square with anotch in the bottom of it. This is the View tool. The notch represents the direction you’re looking. The square is the area to render in 3-D.To use the View tool, follow these steps:1. Move the cursor to where you’d like the view to originate; then click.This moves the view square to that location.2. Move the cursor to one of the corners of the view square, and thenclick and hold down the left mouse button.You can resize the square and rotate its position by moving the cursor.3. Release the mouse button after you define the view area.3-D display troubleshootingIf you get an error message, the system crashes,or the 3-D image isn’t rendered correctly, youprobably have an issue with your graphics card. Check for any updated drivers for the cardon the manufacturer’s Web site. If you findupdated drivers, install them. If that doesn’t solve the problem, turn off anyaccelerator options on the graphics card inthe Windows Display dialog box. The graphicscard might conflict with OpenGL 3-D renderinglibraries that come with the program.See the 3DEM online Help for additional detailson troubleshooting drawing problems.