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Introducing the ArcGIS Marine Data Model
Marine Special Interest Group MeetingESRI User ConferenceJuly 9, 2002
dusk.geo.orst.edu/djl/arcgis
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ArcGIS “Custom” Data Models
• Basemap • Administrative
Boundaries• Utilities• Parcels• Tranportation• Imageryetc ...
• Conservation/Biodiv• Hydro• Groundwater Hydro • Forestry• Geology• Petroleum• Marine• IHO S-S57etc ...
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A Georelational to a Geodatabase Model
• coverage and shapefile data structures– homogenous collections of points, lines, and
polygons with generic, 1- and 2-dimensional "behavior"
• can’t distinguish behaviors– Point for a marker buoy, same as point for
OBS
• “smart features” in a geodatabase– lighthouse must be on land, marine
mammal siting must be in ocean
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Figure courtesy of Anne Lucas, U. of Bergen, Norway
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5Image courtesy of PISCO, OSU
Marine Data Collection
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Overall Process
• Data model template – few weeks to months
• Mature data model – up to few years
• more info at dusk.geo.orst.edu/djl/arcgis/about.html
DraftModel
Review, Projects
Final Model
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Project Milestones
• Oct. 4-5, 2001: Initial Working Group Analysis Diagram, UMLs, Data Structures– Steve Grisé, Joe Breman, Simon Evans– Dawn Wright, OrSt – Pat Halpin and Eric Treml, Duke– Jason Marshall, NOAA CSC
• Nov. 2001: Draft Conceptual FW Document –
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Project Milestones (cont.)
• Early 2002: Review & Case Study Teams
• Interested Participants via web site~150 people 29 countries & USVI
• June 7-8, 2002: Second workshop
• Tonight’s Marine SIG Meeting at ESRI UC
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• basic template for implementing GIS projects– input, formatting, geoprocessing, creating
maps, performing analyses
• basic framework for writing program code and maintaining applications– development of tools for the community
• promote networking and data sharing through established standards
Purpose of Marine Data Model
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Why? (cont.)
• Learning, understanding ArcGIS!
• 2-way educational process: users & ESRI
• Bear DM in mind when collecting data
• The geodatabase– Not going away– Coverages, shapefiles not around forever
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Transition to ArcGIS 8?
• How and when to do it? • How well are marine application domain
requirements met in the geodatabase structure now?
• Understanding the technology and identifying requirements
• Potential benefits
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ArcView 8 vs. ArcInfo 8
• Need AI to fully use data model– Users vs. power users (CD-R vs. CD-RW)
• ArcView and ArcReader can view DM dBs– Features classes, simple analysis
• ArcView 3D Analyst - set of pts. with z as attribute
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Steps in Data Modeling
(1) Model the user's view of data– what are the basic features needed to solve the problem?
(2) Select the geographic representation – points, lines, areas, rasters, TINs
Bathymetry
Sidescan sonar/Backscatter
Shoreline
Marine boundaries (e.g., MPAs)
Geophysical time series
Sub-bottom profiling
Magnetics
Gravity
Seismics
Sediment transport
etc. ...
Marine mammal movement
Atmospheric influences
Sea state
Wave activity
Sea surface temperature
Salinity
Sensor calibration data
Current meters
Density
etc. ...
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Users’s View of Data
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Steps in Data Modeling (cont.)
(3) Define objects and relationships – draw a UML diagram
(4) Match to geodatabase elements– specify relationships, “behaviors”
(5) Organize geodatabase structure
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Core Themes of Objects & Features
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Synthesis, Analysis, Interpretation
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More information,downloads, or join MDM listserv
dusk.geo.orst.edu/djl/arcgis
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Some Issues
• Coastal vs. deepsea balance
• General Data Structures– Your data may not immediately fall into present schema categories– Shouldn’t be a problem with the structure– Still hard to input raw data
• 3D – Many use other software for true 3D analysis (Fledermaus,
Rockware, etc.)– import, conversion to Arc– Geology, geophysics, phys. oceanography software
• How does the model handle TIME? – especially same feature in different locations over time? – Hydro model time series may not be good equivalent after all
• Change in value (flow) for a fixed feature (channel, gauge)