1. New HR-DDS User Services David J. S. Poulter, National Oceanography Centre, UK http://www.hrdds.net

2. Outline of this talk This talk is split into two sections Introduction to the HR-DDS (for those of you who don’t use it) What is the HR-DDS Time series analysis Spatial inter-comparison Anomaly analysis Data access and more Planned new features for the HR-DDS: Pixies (automatic alerts, analysis and more) Regional DDS (R-DDS) Global DDS (G-DDS) Please see me later if you have any questions.

3. http://www.hrdds.net What is the HR-DDS? Not all of you will have used the HR-DDS, so here is a very brief introduction: The HR-DDS is an interactive, web-based analysis system which allows you to perform a quick but detailed inter-comparison of GHRRST products, at approximately 250 globally distributed sites (which are shown on the map below).

4. http://www.hrdds.net What is the HR-DDS? At each of these sites, we produce a common format netCDF3 file for each input file, where there are valid SSTs. These files are called HR-DDS granules. For every granule, we store a representation of the data in a fast relational database. There are now nearly a billion individual statistics in this database. This data base can then be used to produce interactive diagnostic plots of the data.

5. http://www.hrdds.net Time series analysis Time series analysis can reveal anomalies in data, for example when a erratic buoy measurement creates a cold bias in and analysis product:

6. http://www.hrdds.net Time series analysis These plots are configurable, interactively: Apply/ignore bias estimates before plotting Display/hide error bar plotting Time range of data (default 2 weeks – can go up-to 5 years) Activate/deactive in-situ observing systems Select which parameter to plot (SST, wind speed, sea ice fraction, wave height, etc.) Select which statistic to plot (mean, median, stdev, kurtosis, etc.) Select max / min range to plot (or select ‘auto’ for automatic range selection) Minimum granule SST area coverage required for inclusion). Users may also select to plot a X-Y plot instead of a TIME-Y plot

7. http://www.hrdds.net Quick look imagery Clicking on any plot in the plot opens a quick look image of the data in question, to observe any possible cause of errors. From here users may select to view this data against all the other images from that site that day.

8. Spatial inter-comparison and analysis Individual observations may be interactively compared to identify any problems with that file. http://www.hrdds.net

9. Spatial inter-comparison and analysis Trends and such like are easily established.

10. New features under development. Wave HR-DDS: The HR-DDS is extending into Wave data, including both modeled output, and parametric and spectral observations. These are from both altimetry and SAR missions and form part of the ESA GlobWave project. This shows a demonstration product overlaying the Met Office 2 nd generation wave height and direction. http://www.hrdds.net

11. New features under development. Pixies: Pixies are automatic reporting events produced from HR-DDS data. There are three types of pixies. Class 1 Pixie: Simple examinations of the contents of a data product, and the reporting of that via RSS, HTML or email. Class 2 Pixie: More complicated examination of the contents of a product, or the automatic delivery of a set of plots from the website. Class 3 Pixie: Detailed report generated, for example, once per month. Describes the performance of a particular product in a PDF report. These are configured via a user website. http://www.hrdds.net

12. New features under development. Example class 1 pixie: http://www.hrdds.net

13. New features under development. Example class 2 pixie: A daily email listing the locations of diurnal variability > 1.5 K A weekly RSS update with a list of all input files that produced an error. A daily email alert warning analysis providers of a step change in values. http://www.hrdds.net

14. Example class 3 pixie: A PDF report delivered once per month to a data provider, with detailed analysis. These can also provide metrics analysis This technology is being developed for the GlobWave project New features under development. http://www.hrdds.net Aerosol Optical Depth and Surface Solar Irradiance for AATSR L2P products in 2007. Note a general improvement in performance.

15. R-DDS: The Regional Diagnostic Data Set is an extension of the HR-DDS concept. However it will cover a region (such as the Arctic, or Mediterranean). It will operate without a database backend – instead using netCDF4 to allow plotting access to the entire dataset. It will be produce data on arbitrary projections (for our Nordic friends!). Will be limited to a few examples in the first case, and probably to analysis products. New features under development. http://www.hrdds.net

16. G-DDS: The Global DDS (or GMPE DDS) is an extension to the DDS for global products. It combines the interactive features of the HR-DDS with the data of the GMPE. The G-DDS will be a major tool for MyOcean. New features under development. http://www.hrdds.net