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Reiner Schlitzer Alfred Wegener Institute for Polar and Marine Research

ODV Gridding Methods. Reiner Schlitzer Alfred Wegener Institute for Polar and Marine Research. Data Visualization – Honest Way. Data Visualization – Gridded Field. Grid Value Estimation by Weighted Averaging. Gridding Algorithm. Requirements: easy-to-use, fast and „reliable“,

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Reiner Schlitzer Alfred Wegener Institute for Polar and Marine Research

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  1. ODV Gridding Methods Reiner Schlitzer Alfred Wegener Institute for Polar and Marine Research

  2. Data Visualization – Honest Way

  3. Data Visualization – Gridded Field

  4. Grid Value Estimation by Weighted Averaging Gridding Algorithm • Requirements: • easy-to-use,fast and „reliable“, • usable for large datasets of >100000 points

  5. Variable Resolution Grid

  6. Data Visualization (2) Gridded Field „Honest“ Way

  7. Gridding Methods • Gridding is … • important and definitely needed • challenging mathematical problem • obtaining reliable fields is an „art“ Methods

  8. DIVA • Developed at U Liege • 2-Step procedure: • (1) Triangular mesh generation on possibly complex domain(s) • (2) Variational fitting to data and estimation at arbitrary points • Supports: • (1) Variable mesh resolution • (2) Multiple sub-domains • (3) Anisotropic statistics http://modb.oce.ulg.ac.be/projects/SeaDataNet/DivaUserGuide2008.pdf

  9. DIVA Integration in ODV • ODV will automatically… • create all files for DIVA • run DIVA mesh generation and estimation • read and display the gridded field

  10. Domain Example 1

  11. Domain Example 2 East Atlantic West Atlantic

  12. Example (1) - Separating domains…

  13. Example (2) - Maintaining extremes…

  14. Example (3) - Filling large gaps…

  15. Availability http://odv.awi.de • Download and install latest version of ODV (3.4.0) • Download and install the DIVA optional package for ODV odvmpOP_DIVA4.2.1_integration Both are available for Windows, Mac OS X, and Linux.

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