1. 3D Analyst

2. Components ArcScene –Is where 3D Analyst is located –Visualization and Some Analysis ArcGlobe –Like Google Earth – google’s is better ArcMap - does NOT display 3D! ArcCatalog – can preview in 3D

3. 3D Data Has a Z value Elevation is most common Z value But can also represent –Pollution levels –Noise levels –Precipitation …. Etc.

4. Kinds of 3D data structures DEM raster TIN (Triangulated Irregular Network)

5. TIN Every 3 points of Z are connected to make a Triangle w/ Area, Slope, and Aspect.

6. 3D view Open ArcScene Load DEM or TIN Raster will be flat! Set base height Set vertical exaggeration Illumination of DEM

7. Navigation tools different General nav tool Zoom tool Fly tool Guess what? Expand field of view Narrow Field of View Done while we go through these demos

8. Vertical Exaggeration Why? –used to emphasize small changes –bring z-units into proportion with x,y units It is a only visual effect that does NOT affect analysis

9. Illumination Every Scene has a light source – the sun Thus different parts of the scene are illuminated differently The sun’s position is described by… –The sun’s azimuth is measured from 0 (north) to 360 (north) ccw. (315 (NW) is default) –The sun’s altitude (0-90) is its height above the horizion.

11. Layer Properties Base Heights –establishes the elevations of surface locations and features. Extrusions –tells 3D Analyst how high a feature rises above the ground or extends below it.

12. Base Heights Elevation values that are used to display a layer in 3D. These values can come from various places. –layer: the node elevations in a TIN, the cell values in a raster, the z-values in a 3D feature layer, or the elevation attribute values for a 2D feature layer.

13. Rendering In layer’s properties Scene Layer properties

14. Extrusions three-dimensional extension of features. –An extruded point  a line; – an extruded line  a wall; –an extruded polygon  a chunk. There are many methods used to do this

15. Surface Calculations Slope Aspect Hillshade Contours (Reclassification) Pretty much the same as ArcGIS but tools in 3D Analyst Tools

17. Adding 2D data Turning on in TOC does not do much – maybe can’t even see it! Have to set the layer’s elevations –Layer properties/Base Heights from DEM