EGEE2006

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Published on September 27, 2007

Author: Chloe

Source: authorstream.com

Meteorology and Space Weather Data Mining Portal:  Meteorology and Space Weather Data Mining Portal Mikhail ZHIZHIN, Geophysical Center RAS Dmitry MISHIN, Institute of Physics of the Earth, RAS Alexei POYDA, Moscow State University Abstract:  Abstract We will demonstrate an environmental data mining project Environmental Scenario Search Engine (ESSE) including a secure web application portal for interactive searching for events over a grid of environmental data access and mining web services hosted by OGSA-DAI containers. The web services are grid proxies for the database clusters with terabytes of high-resolution meteorological and space weather reanalysis data over the past 20-50 years. The data mining is based on fuzzy logic to make it possible to describe the searching events in natural language terms, such as “very cold day”. The ESSE portal allows parallel data mining across disciplines for correlated events in space, atmosphere and ocean. The ESSE data web-services are installed in the USA, Russia, South Africa, Australia, Japan, and China. The EGEE infrastructure facilitates sharing of the environmental data and grid services with the European environmental sciences community. The work is done in cooperation with the National Geophysical Data Center NOAA and supported by the grant from the Microsoft Research Ltd. Environmental Scenario Search Engine (ESSE):  Environmental Scenario Search Engine (ESSE) Portal for interactive searching for events over a Grid of environmental data services hosted by OGSA-DAI The web services are Grid proxies for the database clusters with terabytes of high-resolution meteorological and space weather reanalysis data over the past 20-50 years The data mining is based on fuzzy logic to search for events in natural language terms, such as “very cold day” Parallel data mining across disciplines for correlated events in space, atmosphere and ocean In cooperation with the National Geophysical Data Center NOAA and supported by the grant from the Microsoft Research Ltd. Environmental Data Sources :  Environmental Data Sources Avalanche in the amount of available data: Monitoring (ground observatories, satellites etc.); Reanalysis data (models that build regular grids of specific parameters based on available irregular data) Examples: SPIDR (Space Physics Interactive Data Archive) From 1930 year ~120 numerical parameters ~0.5 TB NCEP/NCAR Weather Reanalysis Project From 1950 year Weather parameters on regular grid Time resolution 6 hrs Spatial resolution 2.5 deg ~1 TB CLASS (Comprehensive Large Array-data Stewardship System From 1992 year Satellite images from ~100 spectral channels ~1.2 PB, growing ~0.5 PB per year Environmental Data Models :  Environmental Data Models Basic data element is a time series, i.e. an array of values of a parameter at different times at a specific grid point, observatory location, or on specific satellite trajectory These arrays has typical dimension of 106. And basic operations are not joins, but “extracting subrange” or “resampling” Environmental Data Service: OGSA-DAI plugin:  Environmental Data Service: OGSA-DAI plugin Environmental Data Mining :  Environmental Data Mining Currently available environmental data mining portals (GCMD, ESG) search metadata and subset the data: How to find appropriate databases? In addition, ESSE searches for events inside the data: How to interpret a question of a scientist? How to build set of database queries that can answer the question? How to synthesize and present results of a distributed query? Typical ESSE questions: How often do typical Florida spring storms occur? Have the frequency been increasing in the last 10 years? Find day-time DMSP satellite images above Florida with spring storms How to find appropriate databases? XML metadata search:  How to find appropriate databases? XML metadata search How to build set of database queries? :  How to build set of database queries? How to interpret a question of a scientist?:  How to interpret a question of a scientist? Introduce the notion of an Environmental Scenario (ES) as a basic building block for scientific question Interpret ES as a fuzzy query expression Each basic condition in a ES translates into membership function of a fuzzy set, a term in a resulting expression An expression is built using traditional fuzzy logic operations plus “time shift” operator Query terms are evaluated at individual data sources The ESSE engine collects the data and performs fuzzy query operation. The ESSE engine is being built as a Web Service. This enables cascading queries, but raises new research challenges, e.g. optimization of query execution. Defining fuzzy search criteria:  Defining fuzzy search criteria Set the fuzzy constraints on the parameters for the event state, for example: (VERY HIGH TEMPERATURE) and (VERY HIGH HUMIDITY) Working with Environmental Scenarios:  Working with Environmental Scenarios The user may search for a desired scenario by describing several subsequent events. Scenario example: (HEAVY RAIN) followed by (VERY LOW TEMPERATURE) How to synthesize and present results of a distributed query?:  How to synthesize and present results of a distributed query? Environmental Scenario search result is a scored list of candidate events. “Score” represents the “likeliness” of each event in a numerical form The result page provides links to visualization and data export pages Each event can be viewed as time series dynamic 5D volume satellite images animation Data subset for each event can be exported in XML and NetCDF formats Scenario search results: scored event list:  Scenario search results: scored event list “Score” represents the “likeliness” of each event in a numerical form. The results page provides links to visualization and data export pages. Viewing the event in time and space:  Viewing the event in time and space Vis5D time-space-parameter animation Viewing the event from satellites :  Viewing the event from satellites Where do we use Grid infrastructure? :  Where do we use Grid infrastructure? Online demo scenario:  Online demo scenario User login on ESSE portal Search for a database with “cloud cover” parameter and coverage around Moscow Select the database “NCEP Reanalysis”, the location “Moscow”, and the parameter “Cloud cover” Compose the event scenario “Low cloud cover” Search for day events in the summer 2005 Show the most likely event found with time series and satellite images

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