Gis: Advanced Methods - Final Exam

Front 1

Network

Back 1

-System of pathways (ex: roads, utilities, rivers, commodities)

-Topological data structures

-model the real-world

Front 2

Network Data can be either?

Back 2

Geometric or Logical

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Geometric Data

Back 3

Define or analyze the flow of resources

Front 4

Logical Network

Back 4

Stores info about the operation or building of the network elements

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Edge (Path)

Back 5

Simple- end at junctions; separate line b/w

junctions

Complex- junctions in the middle of a line feature

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Junction

Back 6

Where edges meet

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Two Types of Networks

Back 7

Utility (directed) and Transportation (undirected)

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Utility Networks

Back 8

Flow material is based of the network's configuration of sources and sinks

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Source

Back 9

Pushes material away from itself and through the network

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Sink

Back 10

Location where the material going through the network is either used up or exits the network; draw the materials towards them

Front 11

Transportation Networks

Back 11

Drivers choose the direction of travel

Front 12

Attributes of Street Files

Back 12

Distance, Travel Time

Front 13

Network Dataset Wizard

Back 13

automatically detects the attributes of street files

Front 14

Network Analyst in ArcMap solves what problems

Back 14

Best route, Closest facility, service area, origin-destination cost matrix

Front 15

Closest facility solver

Back 15

measures the best routes in terms of distacne, travel cost and provides directions

Front 16

6 Network Analysis Classes

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Facilities, Incidents, routes, point barriers, line barriers, polygon barriers

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Raster attribute tables look the same as vector attribute tables

Back 17

False

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What three fields are always present in a raster attribute table?

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ObjectID, Value, Count

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Raster Processing

Back 19

operates on stacks of aligned cells

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Map Algebra

Back 20

Various calculations derived from each pixel using cell-by-cell formulas

Front 21

In raster map overlay what operations can be done?

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Addition, subtraction, multiplication, division

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How many layers can be processed by raster map overlay?

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more than 2 layers at once

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What is the purpose of mathematical operators?

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can predict certain events, such as erosion potential using the different layers such as rainfall, slope, erodibility, and vegetation cover

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What are Boolean Operators used for?

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To see whether conditions are either true or false

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3D data has a specified _- _____, while 2D data does not

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Z value

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Z-Value can include things such as?

Back 26

elevation, rainfall, temperature, population

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Types of 3D Data:

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Raster and TIN

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Raster 3D Data

Back 28

image and grids are used, created be geostatistical analyst

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TIN

Back 29

Triangular Irregular Network; values are stored at nodes, created from vector data

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3D features can be stored as either?

Back 30

Shapefiles or a Geodatabase feature class

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TIN are constructed of what?

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Triangles with 3-dimensional coordinates

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Control points-

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are the nodes from which triangles are constructed

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Breaklines

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Lines indicating a distinct change in slope on either side of a line (ex: dams, shorelines,ridges)

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To convert a 2D layer to a 3D layer, you need?

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Z-Values

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If the 2D layer is a point layer than each ____ gets a z-value, if it is a polygon layer each ______ gets a z-value

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feature; vertex

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Mesh point

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Where 4 cell corners meet

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Raster mesh points become what in a TIN?

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Nodes

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Large z-tolerance

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fewer nodes in TIN, conversion is faster

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Small z-tolerance

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more nodes, longer conversion

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Base Heights

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the elevation values that are used to display a layer in 3D

3D feature layers use z-values

TIN use node values

Raster use cell values

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Extrusion

Back 41

Extruded points become lines, extruded lines become walls, extruded polygons become blocks

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Decennial Census

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Counts the residents, every 10 years

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American Community Survey

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Annual survey that gathers economic and housing data

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Standard Hierarchy of Census Geographic Entities

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1. Nation

2. Regions

3. Divisions

4. States

5. Counties

6. Census Tracts

7. Block Groups

8. Census Blocks

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3 Methods of Acquiring TIGER GIS Files

Back 45

American Fact Finder

TIGER Website

TIGER Geodatabase