Unit 1 Test 1

Question 1

Why is spatial data special?

Answer 1

1. multidimensional
2. special methods for analysis
3. time-consuming to integrate/analyze

Question 2

2 GIS data models

Answer 2

vector
raster

Question 2

ESRI geodatabase model

Answer 2

data storage for ArcGIS
- collection of geographic data in a file system/folder

Question 2

Scale of measurement

Answer 2

what parts of entities we want to study/measure

Question 2

Scale

Answer 2

what one the map represents in the real world

Question 3

Resolution

Answer 3

how large one pixel on a map represents

Question 4

Precision

Answer 4

smallest difference between adjacent positions that can be recorded (how fine can you measure)

Question 5

Accuracy

Answer 5

how close the data is to representing the real world

Question 6

Locational accuracy

Answer 6

how close is location on map to real location on earth

Question 7

Representational accuracy

Answer 7

how similar is a shape on the map to the shape of the object on the earth

Question 8

Overlay operation examples (5)

Answer 8

clip, intersect, merge, union, erase

Question 9

Proximity operation examples (2)

Answer 9

Buffer thiessen polygons