Lecture 10

Question 1

network data model

Answer 1

connected set of linear features formed from vector lines, with topology

Question 2

network is a

Answer 2

set of edges connected to form joins and loops

Question 3

another word for network

Answer 3

graph

Question 4

4 other words for edges

Answer 4

links, chains, connections, relations

Question 5

2 other words for nodes

Answer 5

points, junctions

Question 6

nodes

Answer 6

represent intersections and interchanges, facilitate flow changes

Question 7

arcs

Answer 7

linear features connecting node pairs, facilitate flow

Question 8

stops

Answer 8

locations on a network where ppl or goods are transferred

Question 9

centre

Answer 9

locations of resource supply or distr facility

Question 10

turns

Answer 10

transition points from one network arc to another

Question 11

distance

Answer 11

euclidean dist along the network segment

Question 12

attractiveness

Answer 12

relative importance of one node with respect to another

Question 13

impedance

Answer 13

cost or time of transversing network arc

Question 14

supply

Answer 14

a node that provide some goods/resc

Question 15

demand

Answer 15

a node that needs some goods/resc

Question 16

geocoding

Answer 16

process of assigning a point location within a coordinate sys

Question 17

2 types of geocoding processes

Answer 17

• direct and continuous (lat/long)
• indirect and discrete (streeet addresses)

Question 18

3 categ of spatial ref sys

Answer 18

• geog identifier ref sys
• linear ref sys
• coordinate ref sys

Question 19

2 characteristics of a street network file

Answer 19

• must be up to date
• must be highly accurate

Question 20

2 errors associated with geocoding

Answer 20

• errors in addresses
• inaccurate locations due to interpolations