GIS in Water Resources: Lecture 1

GIS in Water Resources: Lecture 1. In-class and distance learning Geospatial database of hydrologic features GIS and HIS Curved earth and a flat map. Lectures Powerpoint slides Video streaming Readings “Arc Hydro: GIS in Water Resources” and other materials Homework Computer exercises

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GIS in Water Resources: Lecture 1

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1. GIS in Water Resources: Lecture 1 • In-class and distance learning • Geospatial database of hydrologic features • GIS and HIS • Curved earth and a flat map
2. Lectures Powerpoint slides Video streaming Readings “Arc Hydro: GIS in Water Resources” and other materials Homework Computer exercises Hand exercises Term Project Oral presentation HTML report Class Interaction Email Discussion Examinations Midterm, final Six Basic Course Elements
3. Dr David Tarboton Students at Utah State University Dr Ayse Irmak Students at University of Nebraska - Lincoln Our Classroom Dr David Maidment Students at UT Austin
4. Traditional Classroom Community Inside and Outside The Classroom University Without Walls
5. Instructor-Centered Presentation Community-Centered Presentation Learning Styles Instructor Student We learn from the instructors and each other
6. GIS in Water Resources: Lecture 1 • In-class and distance learning • Geospatial database of hydrologic features • GIS and HIS • Curved earth and a flat map
7. 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
8. Data Model based on Inventory of data layers
9. 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 Polygon - a closed set of lines
10. Themes or Data Layers Vector data: point, line or polygon features
11. Kissimmee watershed, Florida Themes
12. Attributes of a Selected Feature
13. Raster and Vector Data Raster data are described by a cell grid, one value per cell Vector Raster Point Line Zone of cells Polygon
14. Santa Barbara, California http://srtm.usgs.gov/srtmimagegallery/index.html
15. How do we combine these data? Digital Elevation Models Streams Watersheds Waterbodies
16. An integrated raster-vector database
17. Point Water Observations Time Series A point location in space A series of values in time
18. Linking Geographic Information Systems and Water Resources Water Resources GIS
19. Water Information in Space and Time
20. GIS in Water Resources: Lecture 1 • In-class and distance learning • Geospatial database of hydrologic features • GIS and HIS • Curved earth and a flat map
21. What is CUAHSI? UCAR • CUAHSI –Consortium of Universities for the Advancement of Hydrologic Science, Inc • Formed in 2001 as a legal entity • Program office in Washington (5 staff) • NSF supports CUAHSI to develop infrastructure and services to advance hydrologic science in US universities Unidata Atmospheric Sciences Earth Sciences Ocean Sciences CUAHSI National Science Foundation Geosciences Directorate HIS
22. CUAHSI Member Institutions 122 Universities as of August 2009
23. Hydrologic Information System Goals • Data Access– providing better access to a large volume of high quality hydrologic data; • Hydrologic Observatories– storing and synthesizing hydrologic data for a region; • Hydrologic Science– providing a stronger hydrologic information infrastructure; • Hydrologic Education– bringing more hydrologic data into the classroom.
24. Water Data Water quantity and quality Soil water Rainfall & Snow Modeling Meteorology Remote sensing
25. Data are Published in Many Formats
26. Services-Oriented Architecture A services‐oriented architecture is a concept that applies to large, distributed information systems that have many owners, are complex and heterogeneous, and have considerable legacies from the way their various components have developed in the past (Josuttis, 2007).
27. HTML as a Web Language Text and Pictures in Web Browser HyperText Markup Language -->
28. WaterML as a Web Language Discharge of the San Marcos River at Luling, TX June 28 - July 18, 2002 USGS Streamflow data in WaterML WaterML is constructed as a Web Services Definition Language using WWW standards
29. CUAHSI Water Data Services 35 services 15,000 variables 1.75 million sites 8.33 million series 342 million data
30. Texas Water Data Services 10 services 7,010 variables 15,870 sites 645,566 series 23,272,357records
31. A Theme Layer Synthesis over all data sources of observations of a particular variable e.g. Salinity
32. Arc Hydro An ArcGIS data model for water resources Arc Hydro toolset for implementation Framework for linking hydrologic simulation models Arc Hydro: GIS for Water Resources The Arc Hydro data model and application tools are in the public domain
33. Arc Hydro—Hydrography The blue lines on maps
34. Arc Hydro—Hydrology The movement of water through the hydrologic system
35. Integrating Data Inventory using a Behavioral Model Relationships between objects linked by tracing path of water movement
36. Drainage System Hydro Network Flow Time Time Series Hydrography Channel System Arc Hydro Components
37. Analysis, Modeling, Decision Making Arc Hydro Geodatabase Hydrologic Information System A synthesis of geospatial and temporal data supporting hydrologic analysis and modeling
38. GIS in Water Resources: Lecture 1 • In-class and distance learning • Geospatial database of hydrologic features • GIS and HIS • Curved earth and a flat map
39. Origin of Geographic Coordinates Equator (0,0) Prime Meridian
40. 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
41. 60 N 30 N 60 W 120 W 90 W 0 N Latitude and Longitude in North America 40 50 59 96 45 0 Austin: Logan: Lincoln: (30°18' 22" N, 97°45' 3" W) (41°44' 24" N, 111°50' 9" W) (40°50' 59" N, 96°45' 0" W)
42. Map Projection Flat Map Cartesian coordinates: x,y (Easting & Northing) Curved Earth Geographic coordinates: f, l (Latitude & Longitude)
43. Representative Fraction Globe distanceEarth distance = Earth to Globe to Map Map Projection: Map Scale: Scale Factor Map distanceGlobe distance = (e.g. 0.9996) (e.g. 1:24,000)
44. 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)
45. Summary (1) • GIS in Water Resources is about empowerment through use of information technology – helping you to understand the world around you and to investigate problems of interest to you • This is an “open class” in every sense where we learn from one another as well as from the instructors
46. Summary (2) • GIS offers a structured information model for working with geospatial data that describe the “water environment” (watersheds, streams, lakes, land use, ….) • Water resources also needs observations and modeling to describe “the water” (discharge, water quality, water level, precipitation)
47. Summary (3) • Geography “brings things together” through georeferencing on the earth’s surface • Understanding geolocation on the earth and working with geospatial coordinate systems is fundamental to this field

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