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3D Analyst

3D Analyst. Basic Idea. 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. Viewshed. visible. Not visible. From Here. Fall line. Steepest path down hill

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3D Analyst

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  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 • ArcScene • ArcGlobe • 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

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