Arc Hydro: GIS for Water Resources David R. Maidment University of Texas at Austin • Arc Hydro – Culmination of a 3-yr effort – GIS in Water Resources Consortium – Customization of ArcGIS for water resources – Arc Hydro toolset and application framework
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Arc Hydro: GIS for Water Resources David R. Maidment University of Texas at Austin Arc Hydro –Culmination of a 3-yr effort –GIS in Water Resources Consortium.
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Arc Hydro: GIS for Water ResourcesDavid R. Maidment
University of Texas at Austin
• Arc Hydro– Culmination of a 3-yr effort
– GIS in Water Resources Consortium
– Customization of ArcGIS for water resources
– Arc Hydro toolset and application framework
GIS in Water Resources Consortium
Bringing together these two communities by using a common geospatial data model
http://www.crwr.utexas.edu/giswr
GISWater
Resources
CRWR
Geodatabase
MS Access Oracle
SQL Server Informix
DB2
Feature
IFeature : IRowIFeature
IFeatureBuffer IFeatureBuffer : IRowBuffer
IFeatureDraw IFeatureDraw : IUnknown
ArcGIS Introduces
• A new geographic data model• A new geographic database
– Stored in an Relational Database (Geodatabase)
• ArcObjects– Component Object Model
(COM) objects that access geographic data
– Works like MS Word, Excel, Powerpoint, ….
Geodatabase Model
FeatureFeature Geographic ObjectGeographic ObjectRow in DBMS TableRow in DBMS Table
GeodatabaseGeodatabaseCollection of FeatureDataSetsCollection of FeatureDataSetsLike a workspaceLike a workspace
FeatureDataSetFeatureDataSetCollection of FeatureClassesCollection of FeatureClassesLike a CoverageLike a Coverage
FeatureClassFeatureClass Collection of FeaturesCollection of FeaturesLike a Coverage FeatureClassLike a Coverage FeatureClass
• Features are geographic objects stored in relational database tables
• Feature location is an attribute of type shape
– Point, Multipoint, Line, Polygon
– Attributes and geometry are stored together not in separate files as in Arc Info 7 and ArcView 3
Features
Feature Feature (row)(row)
ShapeOID
524 X,Y,Z,M, ...
StreamStream
Type
Channel
. . .
. . .
FeatureClass (table)FeatureClass (table)
Feature DataSets
• A holder for a set of feature classes having a common coordinate system and spatial extent