1. GIS in Water Resources: Lecture 1
In-class and distance learning
Geospatial database of hydrologic features
Arc Hydro data model
Curved earth and a flat map

2. Flooding from Hurricane Katrina
Flooding in
New Orleans
Water mapping
where is the water
what is in the water?
Water movement
where is it going?
Issues for this course

3. GIS in Water Resources: Lecture 1
In-class and distance learning
Geospatial database of hydrologic features
Arc Hydro data model
Curved earth and a flat map

4. Six Basic Course Elements
Lectures
Powerpoint slides
Video streaming
Readings
“Arc Hydro: GIS in Water Resources”
Homework
Computer exercises
Hand exercises
Term Project
Oral presentation
HTML report
Class Interaction
Discussion
Examinations
Midterm, final

5. Learning Styles Instructor-Centered Presentation
Community-Centered Presentation
Instructor
Student

6. University Without Walls
Traditional Classroom
Community
Inside and Outside
The Classroom

7. Distance Learning Dr David Tarboton –students at Utah State University
Other
People
Other
People
Dr David Maidment –students at UT Austin
Dr Tarboton will present lectures on
on spatial and terrain analysis with grids

8. GIS in Water Resources: Lecture 1
In-class and distance learning
Geospatial database of hydrologic features
Arc Hydro data model
Curved earth and a flat map

9. Geographic Data Model
Conceptual Model – a set of concepts that describe a subject and allow reasoning about it
Mathematical Model – a conceptual model expressed in symbols and equations
Data Model – a conceptual model expressed in a data structure (e.g. ascii files, Excel tables, …..)
Geographic Data Model – a conceptual model for describing and reasoning about the world expressed in a GIS database

10. Data Model based on Inventory of data layers

11. Spatial Data: Vector format
Vector data are defined spatially:
(x1,y1)
Point - a pair of x and y coordinates
vertex
Line - a sequence of points
Node
DRM
Polygon - a closed set of lines

12. Themes or Data Layers
Vector data: point, line or polygon features

13. Kissimmee watershed, Florida
Themes

14. Attributes of a Selected Feature

15. Raster and Vector Data Vector Raster Point Line Polygon
Raster data are described by a cell grid, one value per cell
Vector
Raster
Point
Line
DRM
Zone of cells
Polygon

16. Santa Barbara, California

17. How do we combine these data?
Digital Elevation
Models
Watersheds
Streams
Waterbodies

18. An integrated raster-vector database

19. Flooding from Hurricane Katrina
Flooding in
New Orleans
Water mapping
where is the water
what is in the water?
Water movement
where is it going?

20. GIS in Water Resources: Lecture 1
In-class and distance learning
Geospatial database of hydrologic features
Arc Hydro data model
Curved earth and a flat map

21. GIS in Water Resources Consortium
CRWR
GIS in Water Resources Consortium
GIS
Water Resources
Bringing together these two communities by using a common geospatial data model

22. Data Model Based on Behavior
“Follow a drop of water from where it falls on the land, to the stream, and all the way to the ocean.”
R.M. Hirsch, USGS

23. Integrating Data Inventory using a Behavioral Model
Relationships between
objects linked by tracing path
of water movement

24. Arc Hydro: GIS for Water Resources
Published by ESRI Press
The Arc Hydro data model and
application tools are in the public
domain
Notes:
Industrial partners: ESRI, Danish Hydraulic Institute, Camp,Dresser and McKee, Dodson and Associates
Government partners:
Federal: EPA, USGS, Corps of Engineers (Hydrologic Engineering Center)
State: Texas Natural Resource Conservation Commission, Texas Water Development Board
Local: Lower Colorado River Authority, City of Austin, Dept of Watershed Protection
Academic Partners: University of Texas, Brigham Young University, Utah State University

25. Arc Hydro — Hydrography

26. Arc Hydro — Hydrology

27. Arc Hydro Components Drainage System Hydro Network Time Series
Flow
Time
Time Series
Channel System
Hydrography

28. Hydrologic Information System
Analysis, Modeling,
Decision Making
Arc Hydro
Geodatabase

29. Nexrad Radar Rainfall Map

30. Nexrad Map to Flood Map in Model Builder
FLOODPLAIN MAP
Flood map
as output
Model for
flood flow
HMS
Model
for flood
depth
Nexrad map as input

31. GIS in Water Resources: Lecture 1
In-class and distance learning
Geospatial database of hydrologic features
Arc Hydro data model
Curved earth and a flat map

32. Origin of Geographic Coordinates
Equator
(0,0)
Prime Meridian

33. Latitude and Longitude
Longitude line (Meridian) N W E S
Range: 180ºW - 0º - 180ºE
Latitude line (Parallel) N W E S
(0ºN, 0ºE)
Equator, Prime Meridian
Range: 90ºS - 0º - 90ºN

34. Latitude and Longitude in North America
Austin:
(30°N, 98°W)
Logan:
(42°N, 112°W)
60 N
30 N
120 W
60 W
90 W
0 N

35. Map Projection Flat Map Curved Earth Cartesian coordinates: x,y
(Easting & Northing)
Curved Earth
Geographic coordinates: f, l
(Latitude & Longitude)
DRM

36. Earth to Globe to Map Map Projection: Map Scale: Scale Factor
Representative Fraction
Globe distance Earth distance =
Scale Factor
Map distance Globe distance =
(e.g. 1:24,000)
(e.g )

37. Coordinate Systems A planar coordinate system is defined by a pair
of orthogonal (x,y) axes drawn through an origin Y X
Origin
(xo,yo)
(fo,lo)