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GIS > Joints/selections/digitizing > Flashcards

Joints/selections/digitizing Flashcards

1
Q

what are attributes

A

non spatial data associated with a spatial location

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2
Q

where are attributes stored

A

in an attribute table

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3
Q

can vector data have numerous attributes attached to one spatial location

A

YES

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4
Q

what are joints

A

methods of linking two or more attribute tables

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5
Q

how can two tables be joined together

A

through a COMMON FIELD

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6
Q

what are relates

A

a relationship between two or more tables but DOES NOT attach or remove data

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7
Q

what is required for relates

A

a common field

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8
Q

when are relates preferred over joints

A

when working with one to many relationships or numerous tables

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9
Q

when is a spatial joint used

A

when layers DO NOT have a common attribute field

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10
Q

what are join one to one relationships

A

the joining of information with each feature in a target layer

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11
Q

what are join one to many relationships

A

multiple join features overlay the target feature = output will have multiple copies of the target feature

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12
Q

what are three types of selections

A
  1. interactive selection
  2. select by attribute
  3. select by location
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13
Q

when is select by location used

A

for spatial queries

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14
Q

when is select by attributes used

A

for database queries

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15
Q

what language do queries use

A

structured query language

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16
Q

what is a compound query

A

a query used to make selections based on multiple criteria

17
Q

what are the logical operators for query

A

AND

OR

NOT
XOR

18
Q

contrast the four logical operators

A

and - selects INTERSECTION between multiple criteria

or - selects everything that meets BOTH criteria (UNION)

not - select what meets the FIRST criteria but NOT the second

Xor - selects all features that ONLY meets the first and second criteria

19
Q

can the and logical operator be used for the same field

A

NO

20
Q

what is a limitation of the AND logical operator

A

MUST mean both criteria is true

21
Q

what are spatial queries

A

selecting features or information based on spatial relationships

22
Q

what are the different spatial relationships

A
  1. intersect
  2. within a distance
  3. within
  4. completely within
  5. contains
  6. completely contains
  7. boundary touches
23
Q

what is the intersect spatial location

A

features in the input layer are selected if they completely or partially overlaps with the selecting features

24
Q

what is the within a distance spatial location

A
  • creates search area from the selecting feature
  • selects features that fall WITHIN a certain distance
25
Q

contrast within and completely within

A

within
- selects input features that are located COMPLETELY or PARTIALLY within the select feature

completely within
- selects input feature if it DOES NOT share a boundary with selecting feature

26
Q

contrast contains and completely contains

A

contains
- selects the input feature that has the selecting feature WITHIN it

completely contains
- selecting feature MUST be completely within the input feature

27
Q

what is the inverse of within? completely within?

A

within - contains

completely within - completely contains

28
Q

what is the boundary touches spatial location

A
  1. selects the input if it touches the boundary of the selecting feature
29
Q

what shapefile must data be to use boundary touches location

A

lines or polygones

30
Q

what is digitizing

A

a process of creating points, lines or polygons which represent features from a map or image

31
Q

what is important to remember while digitizing

A

errors propagate during digitizing

32
Q

what are two types of digitizing

A
  1. heads down digitizing
  2. heads up digitizing
33
Q

contrast heads up or down digitizing

A

heads up
- on screen digitizing

heads down
- digitizing tables for hardcopy maps

34
Q

how does heads down digitizing work

A

the tablets use a grid of wires to generate a magnetic field which is detected by the cursor

35
Q

contrast point mode vs stream mode digitizing methods

A

point
- user identifies the point to be captured by intentionally pressing a button

stream
- points are captured at set time intervals (the user traces over a feature)

36
Q

what can be an unwanted result of digitizing

A

sliver polygons

37
Q

what are sliver polygons

A

occur when digitized polygons overlay each other and gaps exist between boundaries

38
Q
A

GIS (7 decks)

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