Exercise 7: ArcGlobe layer classification
ArcGlobe classifies layers into three types to help you manage them: elevation, draped, and floating. In this exercise, you'll learn how to use the classifications to help layers provide the right information to your documents. This exercise assumes that you are using default online layers, which require an Internet connection.
If you need to use the system-supplied, coarse layers installed with ArcGlobe, open the default document where you have installed ArcGlobe, for example, C:\Program Files\ArcGIS\Desktop10.0\ArcGlobeData. Set the default layers options, which you learned in exercise 6, to Use my choice of default layers and take a snapshot of the current document.
Adding elevation layers
Elevation layers provide height information to the globe surface. You'll use rasters with height source information to provide topography to the surface of the globe and make it look more realistic.
- Start ArcGlobe by clicking Start > All Programs > ArcGIS > ArcGlobe 10.
- In the ArcGlobe-Getting Started dialog box, click Browse and set the default geodatabase path to D:\3DAnalyst\3D_Default.gdb, if it is not already.
- If prompted, click No to close the Save changes to Untitled ArcGlobe document warning. If you are continuing from exercise 6, you do not need to save the previous exercise's results.
- Click the List By Type button in the table of contents to show the default layer classifications.
- Right-click Globe layers, point to Add Data, then click Add elevation data.
- Navigate to the location of the Exercise7 folder.
- Select sw_usa_grid.
- Click Add.
Adding draped layers
Draped layers are placed on the globe surface and use any elevation data present to show base heights. Next, you'll add images that will be draped on the globe surface in the area you added elevation data.
- Right-click Globe layers, point to Add Data, then click Add draped data.
- Click angelus oaks.tif, press CTRL, then click socal_mmosaic.sid.
- Click Add.
- Right-click angelus oaks.tif and click Zoom To Layer.
- Click and hold the socal_mmosaic.sid layer and drag it so it is just above the Imagery layer in the table of contents.
- Release the mouse pointer to drop the layer in its new position.
Setting a target to initiate Surface mode
- Press CTRL and click the middle of the display.
- Click the bottom of the display and slowly drag up.
- Click the Full Extent button to return the display to the original view.
Adding floating layers
Floating layers are layers that float independently of the globe surface. Next, you'll add a raster as a floating layer and set it to elevations not connected with the globe surface.
- Right-click Globe layers, point to Add Data, then click Add Floating Data.
- Click o3_99x10k.
- Click Add.
Setting elevation properties of floating layers
- Right-click o3_99x10k and click Properties.
- Click the Elevation tab.
- Click Floating on a custom surface.
- Click the drop-down arrow and click sw_usa_grid.
- Type 5000 in the Add a constant elevation offset in meters text box.
- Click the Symbology tab.
- Select the red to blue color ramp from the Color Ramp drop-down arrow.
- Check Invert.
- Click OK.
Setting a vertical exaggeration factor for floating layers
- Right-click o3_99x10k and click Zoom To Layer.
- Click the Navigation Mode button to change the mode to Surface navigation.
- Click the bottom of the display and slowly drag the mouse pointer up.
- Double-click Globe layers.
- Click the General tab.
- Select or type a value of 10 for vertical exaggeration Of floating layers.
- Click OK.
In this exercise, you learned how to differentiate layer types in ArcGlobe, saw the effect they have on the globe, and set properties to improve their display. Explore the Exercise7.3dd globe document in the Exercise7 folder to discover additional ways to enhance your globe documents. The document contains layers saved with custom settings, bookmarks, globe lighting, and animation tracks.