Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation           Topological Modelling       ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Contents    • Visualisation and Mod...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Visualisation and Modelling of     ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Visualisation and Modelling of     ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Visualisation and Modelling of     ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Sequence of shaded contour maps sho...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Sequence of shaded contour maps sho...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Visualisation and Modelling of     ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Visualisation and Modelling of     ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Visualisation and Modelling of     ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Topological Modelling of Atmospheri...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Topological Modelling of Atmospheri...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Topological Modelling of Atmospheri...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Topological Modelling of Atmospheri...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Progress so far #1>Visualisation of...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation      Progress so far #2> Modelling the...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Progress so far #3> Simulations of ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Progress so far #3> Simulations of ...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation         Simplification    Extensificat...
Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation    Future Work    • Extend to Volumetr...
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Application of Morphological Representation to Enhance the Visualization of Dynamic Weather Maps

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"Application of Morphological Representation to Enhance the Visualization of Dynamic Weather Maps" - Presentation at the 2007 American Association of Geographers Conference.

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Application of Morphological Representation to Enhance the Visualization of Dynamic Weather Maps

  1. 1. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Topological Modelling of Atmospheric Surfaces- A Concept Sanjay Rana
  2. 2. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Contents • Visualisation and Modelling of Atmospheric Surfaces • Topological Modelling of Atmospheric Surfaces • Progress so far • Future Work
  3. 3. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Visualisation and Modelling of Atmospheric Surfaces Two main implementations of Atmospheric Surfaces: • In visualisations for general public and meteorologist for making Weather Charts etc. • In Forecasting Models using fairly sophisticated numerical models involving several atmospheric measures and supercomputers!
  4. 4. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Visualisation and Modelling of Atmospheric Surfaces > Visualisation #1 Common visualisation of weather maps produced by experts based on an amalgamation of temperature, pressure and wind velocity surfaces. www.bom.gov.au/nmoc/MSL/ WeatherMap.shtml (9/Apr/07)
  5. 5. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Visualisation and Modelling of Atmospheric Surfaces > Visualisation #2 Sequence of shaded contour maps showing: •Time Slices •Difference Maps to show the overall variations in a period http://weather.unisys.com/surface (9/Apr/07)
  6. 6. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Sequence of shaded contour maps showing temperature over North America at every hour over 12 hours period last week http://weather.unisys.com/surface (9/Apr/07)
  7. 7. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Sequence of shaded contour maps showing change in temperature over North America every hour over past 24 hours last week http://weather.unisys.com/surface (9/Apr/07)
  8. 8. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Visualisation and Modelling of Atmospheric Surfaces > Visualisation #3 Combination of exploratory visualisation techniques (linked views, brushing, interactivity), perspective views and information visualisation. http://www.vrvis.at/simvis/Isabel/ (10/Apr/07)
  9. 9. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Visualisation and Modelling of Atmospheric Surfaces > Modelling Evolution of the global temperature over a month as simulated within the Flexible Modeling Systems (FMS) framework. Requires the use of a CRAY! http://www.gfdl.noaa.gov/~fms (10/Apr/07)
  10. 10. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Visualisation and Modelling of Atmospheric Surfaces > Insights • Visualising the features of the morphological structure (i.e. lows, highs, saddles, weather fronts) of atmospheric surfaces is fundamental for weather interpretations, • Recording the Spatio-Temporal variations in the morphological structure of atmospheric surfaces leads to the development of forecast models, • However, at present there are no representations that create a network of these features i.e. no topological data structures are used to model the surface.
  11. 11. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Topological Modelling of Atmospheric Surfaces > What’s the topology? • All atmospheric surfaces have morphological features such as lows (pits), highs (peaks), ridges, channels as found in terrain and many other surfaces. • Earlier studies in other kinds of surfaces e.g. terrain density, socio-economical, medical imaging, fluid flows etc. have shown that topological representations based on these morphological features provide a global representation of the morphological structure. • This presentation demonstrates some experiments to model the topology of atmospheric surfaces.
  12. 12. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Topological Modelling of Atmospheric Surfaces > What’s the topology? • Morphological Features Peak Pit Saddle Monkey Saddle Channel Ridge
  13. 13. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Topological Modelling of Atmospheric Surfaces > Topological Data Structures • An Example - Surface Network x (1000) 3000 z1 y1 z1(5000) z2(4000) 2000 1000 y1(2000) z2 y2(3000) x 2000 x (1000) 2000 x : Pit y : Pass y2 2000 z : Peak z3(5000) z3 x (1000) (a) (b) (a) A contour representation of an island showing morphological features (elevations given in parentheses), channels (dashed arrows), ridges (solid arrows); (b) corresponding Surface Network Graph. Numbers on the edges of the graph in (b) are the differences in elevation across the edges.
  14. 14. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Topological Modelling of Atmospheric Surfaces > Morphological Features in Atmospheric Surfaces Pits Channels Saddle Ridge Peak
  15. 15. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Progress so far #1>Visualisation of an animated sequence of Atmospheric Surfaces
  16. 16. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Progress so far #2> Modelling the Spatio- Temporal variations in Atmospheric Surfaces #1 time events length, length direction Merging direction length, Scale Space of the surface bifurcation temperature ravine
  17. 17. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Progress so far #3> Simulations of hypothetical weather scenarios #1 • The structure of a Surface Network is a natural representation of the morphology e.g. unlike TIN or Raster • Topologically-consistent manipulation of a Surface Network structure will thus yield theoretically valid alternative states of atmospheric surfaces
  18. 18. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Progress so far #3> Simulations of hypothetical weather scenarios #2 Simplification Extensification y1 zo xo z x xo x zo yo yo y’ xo z z’ xo x x yo x – Pit; y – Pass; z - Pit
  19. 19. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Simplification Extensification Extensification Refinements on longest ridges (indicated by red arrows) of a Surface Network; blue lines- channels, orange lines- ridges, Generating artificial changes by simplification, red discs - peaks, green discs – passes, and black discs - pits. in this case a large valley
  20. 20. Session 15512nd Emerging Computational Techniquesand Technologies in GeoComputation Future Work • Extend to Volumetric atmospheric surfaces • Implement Surface Network/Morse-Smale Complex • Further information on Topological Data Structures for Surfaces in Rana (2005). • Seeking collaborations from researchers in • Computer Vision • Meteorology • Weather Data Providers • GeoVisualization

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