Lecture 7

Question 1

how is GIS analysis diff from mapping/visualization?

Answer 1

facilitate geog distributed analysis of the prob

Question 2

5 Qs addressed with a GIS

Answer 2

• location
• condition
• patterns
• trends
• implications

Question 3

4 analysis methods in increasing order

Answer 3

1. database
2. mapping/visualization
3. spatial analysis
4. spatial modeling

Question 4

3 categories of spatial relationships

Answer 4

• proximal
• topological
• directional

Question 5

spatial analysis allows for 2 geometric relations

Answer 5

• topological
• proximal

Question 6

length of cell in 2D

Answer 6

resolution

Question 7

proximity analysis is conducted to

Answer 7

evaluate the influence of objects w/ respect to other surrounding pbjects (eg. buffers, thiessen polygons)

Question 8

buffering creates (2)

Answer 8

• nearness and farness
• region of influence

Question 9

complex vs simple buffering

Answer 9

diff size buffers vs all the same size

Question 10

theissen polygons

Answer 10

define individual areas of influence around each point in a set (1 pt per polygon)

Question 11

vector overlay analysis

Answer 11

what point/line/polygon is in what polygon (eg. owl nest in tree type)

Question 12

MAUP (modifiable area unit problem)

Answer 12

choice of zones in the study area influence the output stats

Question 13

mean center

Answer 13

avg x and y coordinates of al features in a study area useful for tracking changes in distr of data

Question 14

3 sources of error in vector overlay

Answer 14

• data generalizations (lack of detail)
• edge and boundary effect
• resolution errors