1. GIS in Water Resources: Lecture 1
In-class and distance learning
Land and water interaction
Geospatial database of hydrologic features
Curved earth and a flat map

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

3. Six Basic Course Elements
Lectures
Powerpoint slides
Video streaming
Readings
“Modeling our World”
Narratives written around slides
Homework
Term Project
Oral presentation
HTML report
Class Interaction
Chat room
Examinations
Midterm, final

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

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

6. Utah State University
Dr David Tarboton – terrain analysis with digital elevation models
Dr Tarboton will present lectures on Sept 25, Oct 4, Oct 23, Oct 25

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

8. Geospatial Database

9. Levels of Analysis: Relational Database
Relational Linkages
Spatial Attributes
Water Right
Locations
Descriptive Attributes

10. 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

11. 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

12. National Hydro Data Programs http://www. crwr. utexas
National Elevation Dataset
(NED)
National Hydrography Dataset
(NHD)
Elevation Derivatives for
National Applications (EDNA)
Watershed Boundary Dataset

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

14. An integrated raster-vector database

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

16. ArcGIS Hydro Data Model
Hydrography
Hydrology

17. ArcGIS Hydro Data Model
Drainage
Network
Flow
Time
Time Series
HydroFeatures
Hydrography
Channel

18. Data Model Based on Inventory
NHD Points
Make an inventory of all features of a given type in the region
NHD Lines
NHD Areas
Gages
What is it?
Where is it?
Dams
Bridges

19. 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.

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

22. Open Architecture for Water Modeling
Interface 1
ArcGIS
Interface 2
HydroModel
Process
Engines
Temporal Data
Geospatial data
Interface 4
Custom-designed
Interface 3
Excel

23. TIWSS Texas Integrated Water Simulation System
WRAP
Water Availability
SWAT
Water Quality
Arc Hydro
Geospatial and Temporal Data
Modflow
Groundwater
HEC Models
Flooding & Water Management

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

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

26. 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

27. 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

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

29. 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 )

30. Coordinate System 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)