1. 3D Analyst

2. Basic Idea

3. What can you do with it? Work in the 3D world so can do –Visualization of –Viewsheds, lines of sight –Steepest path descents (fall lines) –Volume and area calculations

4. Viewshed visible Not visible From Here

5. Fall line Steepest path down hill In this case over a TIN Triangular Irregular Network

6. Calculate Volumes and Areas And other stats

7. Convert 2D to 3D

8. The components ArcSceneArcGlobe ArcMap -- this one you know ArcCatalog – and this one also

9. ArcScene Allows visualization of data Allows 3D interaction with data Allows Surface Analysis ArcScene documents are.sxd

10. ArcGlobe

11. ArcGlobe Data for entire globe – but works for part of globe also Can Zoom in and view from different downward angles HUGE databases! ArcGlobe docs are.33d

12. 3D data Rasters -- Grids of continuous (usually) surfaces –Elevation –Water Tables –Pollution plumes TINs 3D features (buildings, trees, fire hydrants) These data have Z values

13. Z Is an attribute Can be elevation But can also be anything else –Depth to water table –Pollutant concentrations –Etc.

14. Z Is an attribute Can be elevation But can also be anything else –Depth to water table –Pollutant concentrations –Etc.

15. Raster (Grid) data Here rainfall decreases from the NW to the SE

16. Raster (Grid) data Snow depth as 2D and 3D

17. TIN A set of non-overlapping triangles that border one another Based on point Z data So are not usually the same size So you have nodes and edges

18. TINs

19. Features

20. Summary 3D analyst is a powerful tool –Visualization of surfaces with Z values –Analysis of volumes and areas –Viewsheds –Steepest decent You can put 3D features (buildings, trees, fire hydrants, etc. on the surface