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3D Analyst – Surface Analysis

7-14-2011. 3D Analyst – Surface Analysis. Raghav Vemula 3D Team. Surface Analysis. Visibility Viewshed Line of Sight. Derivatives Slope Aspect Hillshade. Volume Surface Volume Cut Fill Surface Difference Polygon Volume Extrude Between. Feature Interpolation Interpolate Shape

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3D Analyst – Surface Analysis

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  1. 7-14-2011 3D Analyst – Surface Analysis Raghav Vemula 3D Team

  2. Surface Analysis • Visibility • Viewshed • Line of Sight • Derivatives • Slope • Aspect • Hillshade • Volume • Surface Volume • Cut Fill • Surface Difference • Polygon Volume • Extrude Between • Feature Interpolation • Interpolate Shape • Interpolate Poly To Patch • Surface Length • Surface Spot • Contour

  3. Slope: steepness Aspect: direction of steepest slope Hillshade: steepness and directionrelative to light source

  4. Derivative Calculation • Raster based • Local functions, 3x3 roving windows • Plane fitted to this ‘neighborhood’ • TIN based • Each triangle defines a plane unambiguously

  5. 3x3 Roving Windows Note: Hillshade will not estimate values for boundary cells

  6. Interpolation • Feature interpolation • Raster • Bilinear • Sample distance • TIN • Linear • Natural Neighbors • ‘Natural’ densification • Contouring • Similar for both raster and TIN • Linear threading through triangles

  7. Cell vs. Surface Data Area Raster image boundary Surfacedomain Interpolation zone is ½ cell in from image boundary

  8. Raster Profile Sampling

  9. TIN Profile Sampling

  10. Visibility • Line Of Sight (LOS) • Inputs are 2D or 3D lines • Only 1st and last vertices used as observer and target points • Raster and TIN implementations • Viewshed • Frequency and Observers options • Raster algorithm

  11. Line of Sight 231 206 181 Elevation Observer Target 156 0 75 150 225 300 345 Distance

  12. Line of Sight Offset When offset, the target can be visible even though the profile on the surface at that position is not.

  13. Line of Sight 231 206 181 Elevation Obstruction Point 156 0 75 150 225 300 345 Distance When a target isn’t visible, its obstruction point always occurs along a visible portion of the profile.

  14. Volumetrics • CutFill • Raster/cell based • SurfaceVolume • Raster and TIN/Terrain • TIN/Terrain specific • Polygon Volume • Surface Difference • Extrude Between

  15. Demo

  16. http://www.esri.com/sessionevals

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