midterm review-vector data Flashcards
List the 4 vector data structures.
Spaghetti model
Vertex dictionary
Dual independent map encoding (DIME)
Arc/node topological model
T or F, spaghetti model and Vertex Dictionary/ Whole Polygon model shows spatial relationship
F
What are the 4 weaknesses of the Spaghetti model
Redundancy-common boundaries recorded twice
No topological information
Nested polygons
Slivers and gaps
T or F. The vertex dictionary does not have duplication
T
Dual independent map encoding assigns a directional code in the form of a _ _ and a _ _
From node
To node
T or F,DIME has topological information
F
T or F
Left polygon is the polygon on your left as you walk in the direction of the from node to the end node
T
Topology is the relationships in _ terms between _ or _ _ _.
spatial
connected
adjacent geographical objects
_ and _ between objects are independent of their coordinates
connections
relationships
match Connectivity Area definition Contiguity a.line-polygon relationship b.point-line relationship; line-line connection c. polygon-polygon adjacency
connectivity-b
area definition-a
contiguity-c
Topology is the _ _ used to define _ _
mathematical model
spatial relationships
list the 3 advantages of the topological model
Spatial analysis
data validation
reduces data set size
Name the 3 steps of database creation
input spatial data
input attribute data
linking spatial and attribute data
what steps are included in inputing spatial data?
Building topology and editing
Name the 4 steps of edge matching
adjust edge features
join adjacent layers
dissolve boundary lines
re-establish relates
What are the 3 characteristics of database models?
Flat file or spreadsheet
hierarchical
relational
An idea GIS database model _ the uniqueness of every feature while _ total data quantity
maximizes
minimizes
Name the 3 attribute database models
Flat files
Hierarchical files
Relational files
T or F
flat file can only search by key field
T
Hierarchical files are _ directional
uni
Which database model doesnt need a key?
Relational files
match row column table number of rows a table contains number of columns in a table a. relation b.degree c. cardinality d. tuple e. attribute/item
row-d column-e table-a # of rows in a table-c # of columns in a table-b
