Visualization, analytics and spatial decision support in...
Transcript of Visualization, analytics and spatial decision support in...
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Visualization, analytics and spatial decision support in the Geosciences Network
(GEON)
Mark Gahegan
GeoVISTA Center,Department of Geography, Penn State
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There were three academics on a train…
• A Geographer, a Geologist and a Mathematician…
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Cyberinfrastructure (CI)
“Like the physical infrastructure of roads, bridges, power grids, telephone lines, and water systems that support modern society, "cyberinfrastructure" refers to the distributed computer, information and communication technologies combined with the personnel and integrating components that provide a long-term platform to empower the modern scientific research endeavor.”
"National Science Foundation Releases New Report from Blue-Ribbon Advisory Panel on Cyberinfrastructure,"
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The Geosciences Network (GEON): www.geongrid.org
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Cyberinfrastructure: The GEON Network
Compute cluster
1TF cluster
Livermore
PoP node
Data Cluster Partner services
USGS
GeologicalSurvey ofCanada
ESRI
KGS
Partner Projects
Chronos
CUAHSI
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Higher-Order CI Services
1. Data Integration– Defining “views” across multiple sources
Multiple database schemas, e.g. in GEON PAST (Paleogeographyand AMOCO database), Chronos (Paleostrat, Neptune, Paleobiology), Geochemisry (Navdat, PetDB, …)
Multiple maps and map layers
2. Visualization– Simulation of earthquake dynamics– Visualizing knowledge structures and visual search for
useful resources3. Analysis and Workflows
– Iconic representation of databases and tools– Ability to link together tools and data to specify
computations
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1. Data Integration
Automated schema integration using ontologies…
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(Davenport and others, 1996)
ONE MOTIVATING EXAMPLE: Map construction and semantic conflict
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GEON: Multiple, different geological ontologies
Genesis
Fabric
TextureKai Lin, SDSC
Boyan Brodaric, GSC
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Integration via shared schemaAKS1
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Slide 11
AKS1 We have constructed a pluton schema that is strongly field based. Many of the databases within this schema are searchable . It is important to emphasize that multiple schemas ( as long as attributes are clearly organized) can be integrated through GEON.A. K. Sinha, 10/24/2003
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Rock Taxonomy
Geological taxonomy converted to an ontology
Gathered from experts during a specially convened workshop
Formalizes relationships between concepts
Randy Keller (UTEP), Bertram Ludaescher, Kai Lin,
Dogan Seber (SDSC), et al
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Geologic Map Integration in the Portal
• After registering datasets, and their ontologies, mappings can be constructed between the datasets via the ontologies—semantic mediation
Kai Lin, SDSC
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2. Visualization
Visualizing simulations, data, knowledge…
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3D Earthquake Modeling using HPC
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Earthquake scenarios
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Finding what you need: Searching the GEON Resource Catalog
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GEON: Thematic Areas (AGI topic map)
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Ontologies by themselves are not enough
• Top down knowledge (ontology) only gets you so far…– Experiences, use-cases (situations surrounding the use of
resources), Social networks, etc. also carry meaning
• Current ontologies are static resources…– Our understanding is dynamic & continually evolving…
• What happens to all the millions of geographical resources that predate ontologies?– The cost of retro-fitting ontologies is prohibitive.
• We DO NOT all understand the world in the same way– We do not share the same ontologies
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Adding in people, places, publications, organizations, …
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…and tools for navigation
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information(name)
….string binary numbersPragmatics?
• Information Semiotics (after Sowa, 2000)
Lake Erie
Lake Eriesymbolobject
concept
‘Lake Erie’sign
meta level
top level ontology
domain, task
application
data level
(Guarino, 1994; 1998)
(Brachman, 1979)
Semantics
Lake
Concept representation
‘Lake’
‘Concept representation’
Syntactics
‘01001…’‘0x486…’
scope
Meaning is carried in formal descriptions (semantics) but also in how things are used and
made (pragmatics)
Brodaric and Gahegan. 2005
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(Davenport and others, 1996)
Looking Deeper: Map construction and semantic conflict
C: intra-geologist clustering
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C: inter-geologist similarity
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“Knowledge soup” – Sowa, 2002
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A knowledge portal(Nexus of knowledge structures: Whitehead, 1923)
Codex: Bill Pike (PSU, PNNL): GEON researcher
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Gravitational anomaly concept map(GEON: Randy Keller)
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Knowledge does not exist in isolation: Connecting Concepts to Data
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region conceptsprototype properties
Gr
Ss
cluster(properties)
class (objects)
clustering classificationindividuation
Brodaric & Gahegan, 2007
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Compare possible categories
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3. Analysis and Workflows
Creating, sharing and preserving experiments in GeoVISTA Studio…
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Example: GeoVISTA Studio
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Heterogeneous components wired together in the Studio Design Box
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Identify Relevant Resources
Categories Domains of Origin Sample JavaBeans Components
Swing Basic GUI components from the javax.swing package.
GeoViz General components for geographical visualization.
Java3D 3D visualization components based on Java3D technology.
SOM Pattern clustering and classification tools based on self-organization map.
SpatialDM Specialized data analysis and information visualization tools tailored for spatial data mining.
GeoTools Geospatial data handling tools based on OpenGIS standards and the GeoTools API.
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How does Studio work?
• Studio employs JavaBean technology to construct tools. The JavaBean specification defines a set of standardized Application Programming Interfaces (APIs) for the Java platform.
• From this, the builder automatically constructs a syntactic description of the functionalities and i/o methods of any bean.
• Will run on any platform with JVM / JBean API
Architecture: application builder
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WHICH TOOLS GO WHERE? Methods according to the roles they play
Databases Statistics A. I. Visualization Finding Association
rules Local pattern analysis and global inferential tests
Neural networks, decision trees
Exploratory visualization Visual data mining
Reporting Rule lists Significance and power
Likelihood estimation, information gain
A stimulus within the visual domain
Representing Schema update, metadata
Fitted statistical models, local or global
Conceptual graphs, meta models
Shared between the scene and the observer
Validating Weak significance testing
Significance tests
Learning followed by verification
Human subjects testing.
Optimizing Reducing computational complexity
Data reduction and stratified sampling strategies
Stochastic search, gradient ascent methods
Hierarchical and adaptive methods, grand tours
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Moving between activities: a ‘discovery’ path
Exploration: EXPLORING,
DISCOVERING
Analysis: GENERALIZING,
MODELING
Evaluation:EXPLAINING,
TESTING,GENERALIZING
Presentation: COMMUNICATING,
CONSENSUS-BUILDING
Synthesis: LEARNING,
CATEGORIZING
Data
Map
Explanation confidence
Results
Theory
Category, relation
Model
Concept
Hypothesis
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Data
Concept
Results
Theory
Explanation confidence
Exploration: EXPLORING,
DISCOVERING
Analysis: GENERALIZING,
MODELING
Evaluation:EXPLAINING,
TESTING,GENERALIZING
Presentation: COMMUNICATING
, CONSENSUS-BUILDING
Synthesis: LEARNING,
CATEGORIZING Category, relation
Map
Model
Hypothesis
Scatterplot, grand tour, projection pursuit, parallel coordinate plot, iconographic displays
Self organizing map, k-means, clustering, geographical analysis machine, data mining, concept learning.
Interactive visual classification, parallel coordinate plot, separability plots, graphs of relationships
machine learning, maximum. likelihood, decision trees, regression & correlation analysis
Scene composition, information fusion, visual overlay
Statistical modeling,
Uncertainty visualization
Statistical testing, M-C simulation
Maps, navigable worlds, charts, immersive visualizations
Databases, Digital libraries, clearinghouses
Activities, tools and inference
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Activity Visualization Computation Representation
Object Collection
Reasoning
Exploration
Synthesis
Analysis
Explanation
Presentation
Discovery: Activities, Tools, Representation forms and Reasoning
PCP, Scatterplot,
iconographic displays
AbductiveSOM, k-means,
clustering methods, GAM
Attribute Description
Description Dataset
InductiveConcept TaxonomyInteractive visual
classification, PCP
machine learning, max.
likelihood, decision tree
RhetoricalSymbol Map
Narrative StoryMaps, charts, reports, etc.
Web mapping, digital libraries, collaboratories
DeductiveRule Theory
Occurrence Model
Scene composition, visual overlay
Statistical analysis
Model-basedInference ExplanationUncertainty visualization
Statistical testing, M-C simulation
(Gahegan & Brodaric, 2002)
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Example: An emergent disease, possibly vector-borne
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Is it West Nile Virus?
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Exploring anticipated infection patterns
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Matching symptoms against CDC documents
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Searching for alternative explanations
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Analyzing likely impacts
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Summary: Many CI challenges
• Technical…• Conceptual…• Sociological…What needs to change?
– Self-sustaining cyberinfrastructure?– Participation and adoption by science
communities (opportunities, risk, resistance)?– Recognition of different forms of science
contribution…
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End
Questions? Suggestions?
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Inspiration
• “Knowledge keeps no better than fish”-- Alfred North Whitehead
• “You cannot put your foot in the same stream twice”
-- Heraclitus
• “You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... So let's look at the bird and see what it's doing -- that's what counts.”
-- Richard Feynman