Transcript Presentation Title - SJRWMD

Arc Hydro in Florida:
Core Principles and Collaboration
Overview of Arc Hydro Concepts
Dean Djokic, ESRI
November 4, 2005
Agenda
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Overview of data model purpose
Template model overview
Selected design topics and tools
Arc Hydro II special topics
Discussion
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Review of geodatabase issues
• Adding shapefiles and coverages into an
ArcMap session does not make a geodatabase
• Loading shapefiles and coverages into a
geodatabase does not make a (efficient)
geodatabase.
• Ignoring geodatabase capabilities increases
cost of development and ownership
• When developing data, ignore spatial reference
issues at your own peril
• SDE and versioning (including disconnected
editing) do not replace the need for careful
workflow development
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How “Things” Build Up
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Database development
Data preparation
Terrain preparation
“Watershed” delineation
“Watershed” characterization
• Parameterization
• Model pre and post-processing
Generic
Semi-Generic
Model Specific
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Arc Hydro
Template Data Model
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Template Data Models
Project Data Models
FEMA
HEC
…
GIS/IT Standards
ISO
Template Data Models
FGDC
Arc Hydro
Parcel
…
OGC
ArcGIS Core Data Model
Industry
Object
Feature
Templates
Provide an
Important
Link
Between
Project
Teams,
Standards,
and ESRI
Software
Development
Topology
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Arc Hydro
• Extension of geodatabase model for support
of water resources applications (template
data model)
• Culmination of a three year process led by
D.R. Maidment through GIS in Water
Resources Consortium (Arc Hydro book)
• Collection of tools for support of Arc Hydro
geodatabase design and basic water
resources functions
• Starting point for water resources database
and application development
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Basic idea: Transition from …
Streams
Drainage Areas
Hydrography
Data Model
Based on
Inventory
Channels
Terrain Surfaces
Rainfall Response
Digital Orthophotos
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… and …
Follow a drop of water from where it falls on the land, to
the stream, and all the way to the ocean.
Data Model
Based on
Behavior
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… to Arc Hydro Data Model
Integrate Data Inventory using a Behavioral Model
Relationships between
objects linked by tracing path
of water movement
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Basic Concepts
• Define core feature classes for water resources
analyses
• Establish relationships between core feature
classes
• Use geometric network for tying pieces together
• Mobilization of standard ArcGIS functionality
• Custom tools for some of the attribute
management
• Custom tools for advanced “water resources”
functionality
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Data Model Purpose
• Target audience: Water resources (surface)
community interested in quick start in ArcGIS
implementation
• Starting point for project model design
• Not a “do all” design
• Not implementation/application specific, but
provides the key components to develop on
top of
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Template Data Model Approaches
Water Resources
Floodplain
WQ
Arc Hydro
Permitting
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Thematic Content
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Arc Hydro Database Definition
• A geospatial and temporal data model for water
resources that operates within ArcGIS
• Five key conceptual areas
– Drainage - Drainage areas and stream lines defined
from surface topography
– Flow network - Connected sets of points and lines
showing pathways of water flow
– Hydrography - The base data from topographic
maps and tabular data inventories
– Channel description - A 3-D line representation of
the shape of river and stream channels
– Time series - Tabular attribute data describing timevarying water properties for any hydro feature
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Arc Hydro Data Model
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Arc Hydro Data Model Details
• Detailed representation at the end of
corresponding chapters in the book (e.g. p 51)
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Arc Hydro Key Fields
• Few predefined fields/attributes
– Identification/relates
• HydroID, NextDownID, DrainID, JunctionID, FeatureID,
…
• HydroCode, ReachCode, CSCode, …
– Measures
• LengthKm, AreaSqKm
• LengthDown, DrainArea
– Auxiliary
• FType, Name, Flowdir, …
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HydroID Story
• HydroID – a unique integer identifier for
every feature within a geodatabase
• An internal identifier whose value is used
for establishing the relationships within the
Arc Hydro data model (HydroID, DrainID,
NextDownID, JunctionID, …)
• Focus on local (within a geodatabase)
uniqueness, but can be made global
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HydroCode Story
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Relationships
• Establish a formal (geodatabase)
relationship between two feature (object)
classes using predefined ID properties.
– HydroID-based (e.g. NextDownID,
JunctionID, DrainID)
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“HydroJunctionHasWaterbody”
“HydroJunctionHasWatershed”
“HydroJunctionHasMonitoringPoint”
“MonitoringPointHasTimeSeries”
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Relationships (an example – “HydroJunctionHasWaterbody” - definition)
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Connecting to Time Series
Flow
DrainagePoint
HydroID
Junction
FeatureID
Time
TimeSeries
HydroPoint
CrossSection
FeatureID of time series
is HydroID of the feature
the time series describes
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Time Series Data Structure
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Time Series Dilemma
• Simplicity in structure
– Easy to import and export time series data from
other sources
– Easy to use standard ArcGIS tabular functionality
and SQL statements
– Needs “transposition” for efficient use for rendering
data spatial data
– Large table with potentially millions of records
– Inefficient storage of specific types of temporal data
(many to many case)
–…
• Need more flexibility (but at a cost of
complexity)
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Hydro Network
• Backbone of Arc Hydro - establishes
connectivity between core feature classes
• Hydro edges (lines through which water flows)
and junctions (confluences, other points of
interest)
• Other feature classes connected to junctions
through relationships (e.g.
HydroJunctionHasWatershed)
• Allows upstream/downstream tracing (and
other out of box ArcGIS network functionality)
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Hydro Network
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Extending Arc Hydro Data Model
• Arc Hydro is by design a starting point
for complex database design
• Arc Hydro data model can be extended
with additional feature classes and/or
attributes (or some Arc Hydro feature
classes can be ignored)
• Use additional GIS data sources
(GRID & TIN)
• Use all existing IDs and tools to
minimize duplication of effort
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Extending Arc Hydro Data Model
More application
specific “stuff”
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Arc Hydro Tools Overview
(1)
• A set of tools that “exercises” the Arc Hydro
model
– Integral with standard ArcGIS functionality
• Key field (property) management
– HydroID & related IDs
– Length/Area measures
• Core functions
– DEM-based watershed delineation
– Network generation
– Attribute and network tracing and summary
operations
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Arc Hydro Tools Overview
(2)
• Distribution (version 1.1)
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A toolbar with packaged menus and buttons
Supporting documentation/help
ArcGIS 8.3 and ArcGIS 9/9.1 versions
Licensing depends on functions used
• ApUtilities
– Set of utilities common to most ArcObjectbased applications developed at ESRI
Professional Services in water resources area
• Public domain
– Maintained by Professional Services @ ESRI
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Key Concepts
• Transitions between the raster and vector
worlds – integrated operations
• “Relationships between objects linked by
tracing path of water movement”
Raster
Extended Network
Vector
Network
Logical Schema
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Arc Hydro Tools
• Arc Hydro Menus
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Terrain Preprocessing
Terrain Morphology
Watershed Processing
Attribute Tools
Network Tools
ApUtilities
Buttons
• Buttons
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Flowpath tracing
Point delineation
Batch point generation
Assign related identifier
Global point delineation
Trace by NextDownID
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Arc Hydro Tools Faces
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Demonstration
• Functionality available through core ArcGIS –
take advantage of out-of-the-box functionality
– Domains
– Relationships
– Tracing
• Arc Hydro tools
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Arc Hydro in Action
• Various entities/applications
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StreamStats (USGS)
Debris flow predictions (USGS)
Map2Map (SARA)
GeoHMS/GeoRAS (HEC)
Engineering database design (SWFWMD)
Environmental modeling (SJRWMD)
Hydroperiod (SFWMD)
Statewide database (OMNR)
…
• Meetings
• Training
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Many Aspects of Arc Hydro
Database design
Marketing
Tools
Application
“Standard”
Development environment
Saxe, John Godfrey, 1963, “The Blind Man and the
elephant”, New York: Whittlesley House
Elephant illustration ©2002 Jason Hunt
www.naturalchild.org/jason
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Where’s Arc Hydro?
• Hydro model page at:
support.esri.com/datamodels
• Arc Hydro home page at GIS Water
Resources Consortium at:
www.crwr.utexas.edu/giswr/hydro
• Dr.Maidment’s home page at:
www.ce.utexas.edu/prof/maidment
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Data Model User Group
• Check out:
http:/support.esri.com/datamodels
• Can be added to a data models user group list,
and sent notifications about webcasts, training,
publications
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Arc Hydro II
• Additional database design components
– Groundwater
– Time series
• Updated “blue” book
• Advanced Arc Hydro training
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Describing the Hydrologic Cycle
Atmospheric – Land surface
Arc Hydro
surface water
Drainage System
Hydro Network
Flow
Hydrography
Channel System
Time
Time Series
Arc Hydro
groundwater
Hydrogeologic unit Borehole
Layers
Solid
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Review and Q & A
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Data model and tools
Public domain
Established
Community development
Documentation and training
• Get involved !!!
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