Gis in water resources lecture 1
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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

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GIS in Water Resources: Lecture 1

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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

  • Arc Hydro data model

  • Curved earth and a flat map


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

Six Basic Course Elements


Instructor-Centered Presentation

Community-Centered Presentation

Learning Styles

Instructor

Student


Traditional Classroom

Community

Inside and Outside

The Classroom

University Without Walls


Utah State University

Dr David Tarboton – terrain analysis with digital elevation models

Dr Tarboton will present lectures on Oct 8-10


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


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

Polygon - a closed set of lines


Raster and Vector Data

Raster data are described by a cell grid, one value per cell

Vector

Raster

Point

Line

Zone of cells

Polygon


How do we combine these data?

Digital Elevation

Models

Streams

Watersheds

Waterbodies


An integrated raster-vector database


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


What is Arc Hydro?

  • An data infrastructure for storing and integrating hydro data within ArcGIS

    • A set of hydro objects built on top of ArcObjects

    • A set of standardized attributes

    • A vocabulary for describing data (glossary)

    • A toolset for implementing the data model


Drainage System

Hydro Network

Flow

Time

Time Series

Hydrography

Channel System

Arc Hydro Components


Arc Hydro Data Model

Hydrology

Hydrography


Data Model

Based on

Inventory

Streams

Drainage Areas

Hydrography

Channels

Terrain Surfaces

Rainfall Response

Digital Orthophotos


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


Arc Hydro Framework dataset for USA at 1:500,000 scale

Built from USGS and National Weather Service data

MonitoringPoints are USGS stream gaging stations

Arc Hydro USA


Building

lot

Arc Hydro

Applied

to an Urban

Subdivision

Storm

sewer

Grassy

swale


Arc Hydro Framework Input Data

Watersheds

Waterbody

Streams

Monitoring Points


Arc Hydro Framework


Hydrologic Cataloging Units (HUCS)

Hydrologic Unit Code

= 12100203

Guadalupe Basin

(4 HUC’s)

  • 2015 HUC’s cover continental US

  • average area ~ 1 county


Arc Hydro Framework Dataset for the Guadalupe Basin


HydroNetwork through Canyon Lake

Flowlines through water body

Generic Junction

(for topological connection of edges)


HydroJunction has Waterbody Relationship


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


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

60 W

120 W

90 W

0 N


Map Projection

Flat Map

Cartesian coordinates: x,y

(Easting & Northing)

Curved Earth

Geographic coordinates: f, l

(Latitude & Longitude)


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)


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)


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