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

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

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 Email Chat room Examinations Midterm, final

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

University Without Walls Traditional Classroom Community Inside and Outside The Classroom

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

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

Geospatial Database

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

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

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

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

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

An integrated raster-vector database

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

ArcGIS Hydro Data Model Hydrography Hydrology

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

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

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.

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

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

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

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

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

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

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

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

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. 0.9996)

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)