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An Australian Geoscience Data Cube Aaron Sedgmen Geoscience Australia.

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Presentation on theme: "An Australian Geoscience Data Cube Aaron Sedgmen Geoscience Australia."— Presentation transcript:

1 An Australian Geoscience Data Cube Aaron Sedgmen Geoscience Australia

2 Overview Organisational background Data cube concept Geoscience Australias data cube implementation The shift from traditional methods of managing EO data Example applications of the data cube Where to with the data cube An Australian Geoscience Data Cube

3 Organisational Background Geoscience Australia – a government agency providing advice and information to the Australian Government and geoscientific information to industry and other stakeholders. National Earth Observations Group - provides earth observation products and services as well as expert advice, and information for decision makers. An Australian Geoscience Data Cube

4 The Space-Time Data Cube: a new paradigm for managing and using environmental data

5 An Australian Geoscience Data Cube (x) 575 (t) x 7 (λ) The Data Cube concept

6 An Australian Geoscience Data Cube Cubing Landsat images Dice… & … Stack time space Landsat images Tile squares

7 GAs data cube implementation GA developed a working data cube prototype in early 2013 to undertake time-series analysis of Landsat data Contains fifteen years ( ) of the Landsat 5 & 7 archive covering the Australian land mass 3,960,528 tiles sourced from a total of 550,537 Level 1T, ARG25, Pixel Quality & some Fractional Cover datasets 110TB of compressed geoTIFF files Access to the cube is via a Python API that enables generation of mosaiced time slices, and temporal stacks of derived quantities Users can apply their own algorithms via the API for generating derived quantities An Australian Geoscience Data Cube

8 Hosting of the data cube at NCI The GA data cube is hosted on the National Computational Infrastructure (NCI), located at the Australian National University in Canberra. The Raijin super computer at the NCI is currently ranked around 27 th in the world, based on the following specifications: 57,472 cores 160 Tbytes memory 10 Pbytes spinning disk 1.2 Pflops computer performance The storage and processing power available at NCI is a critical enabler for the data cube An Australian Geoscience Data Cube

9 1Petabyte hierarchical archive: Millions of individual scenes Tape store accessed by robot. Orthorectification calibration, cloud Masking, atmospheric correction, mosaicing Feature extraction, algorithm application spectral unmixing Product packaging and delivery Identify footprint of product in space or time Client requests product Search catalogue order scenes GAs Traditional EO product process EO products have traditionally been produced on demand for areas of interest from tape archives of scene based raw data

10 A paradigm shift from traditional methods The data cube holds multiple Landsat products for the entire archive – removes the need to generate products at time of request Hosting the data cube at NCI co-locates big data with high performance computing – enables in-situ analysis of the whole archive Computational analysis is moved from the scientists local environment to a central HPC facility Removes the need to download and replicate the data Provides computing power not otherwise available to many scientists Opens up possibilities to integrate the Landsat archive with other big data datasets hosted at the HPC facility An Australian Geoscience Data Cube

11 Surface water Menindee Lakes time series Total observations per grid cell ~ *4000 grid cells

12 Continental-Scale surface water results An Australian Geoscience Data Cube Time series analysis of entire 15yr archive of ARG25 data at 25m resolution. ~2 days processing time (pre Raijin HPC facility)

13 What the GA data cube is not (yet) A publically available production system Still a working prototype being used for internal environmental science projects A real-time delivery system for time-series data serving large numbers of concurrent users (i.e. a web-delivery system) A number of OGC specifications, including CF-netCDF, Web Coverage Service (WCS), Web Processing Service (WPS) and Web Coverage Processing Service (WCPS), are being investigated for enabling this capability. Yet another system for delivering pretty pictures (a la GeoServer or Google Earth Engine) The data cube environment is optimised for scientific analysis. The delivery of portrayal data (e.g. map images via WMS) is best served by systems optimised for data distribution. An Australian Geoscience Data Cube

14 Acknowledgements Dr Stuart Minchin – Chief, Environmental Geoscience Division Geoscience Australia Alex Ip – Senior Developer, eResearch Infrastructure Geoscience Australia An Australian Geoscience Data Cube

15 Phone: Web: Address: Cnr Jerrabomberra Avenue and Hindmarsh Drive, Symonston ACT 2609 Postal Address: GPO Box 378, Canberra ACT 2601 Questions? Thank you


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