Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

GIS > Final > Flashcards

Final Flashcards

(63 cards)

Start Studying
1
Q

what is a network?

A

a system of interconnected lines and intersections, abstract representation of real world routes of people objects phenomenon etc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is geocoding?

A

finding a geographic location from an address

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

In order to geocode we have to have

A

input dataset
output dataset
processing algorithm
reference dataset

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is an input dataset?

A

a list of addresses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is an reference dataset?

A

a database of geospatial information, defines beginning and end number of each street

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is a processing algorithm

A

locates the input dataset

breaks the addresses into parts and then figures out where on the block it should be

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is an output dataset?

A

a set of poitns, geospatial information associated with the inout dataset

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the network types?

A

transportation (undirected) and geometric utility (directed)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the components of a transportation network?

A

edges, junctions, barriers, turns

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what are the components of a directed network?

A

Edges, sinks, source junction, barrier, point feature, area feature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

List the steps in address geocoding

A

addresses are parsed into seperate components
each component is compared to the same field in the reference layer
candidates are scored based on closeness of matches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What score means the geocoding was a good match?

A

80-100

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what are some problems with TIGER files?

A

Accuracy of location and correctness of address and location

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is an event layer?

A

The layer added from x y points

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Types of transportation network datasets

A

optimum route shortest path, optimum route travelling salesman, closest facility, service area, location allocation modeling for a facility location, origin destination cost matrix,

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Types of geometric utility datasets

A

flow direction, tracing edges and junctions upstream or downstream, artificial barrier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What are spatial operations

A

spatial functions, operations work on coordinate information and attribute data, solve a spatial problem

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what are selection operations

A

similar to attribute queries, selection function work on spatial data, create layer from selection, use set algebra

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is boolean algebra

A

AND OR NOT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what are spatial selection operations

A

adjacency, containment, are identical to, intersect, are within a distance of

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What are classification operations

A

reclassification or recoding, categorizes geographic operations on a set of conditions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What are overlay functions

A

data must be in common coordinate system, both spatial and attribute data may change, combines features at same location

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is a clip

A

boundary layer is cookie cutter, data layer is clipped, output has attributes of only the data layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is an intersect?

A

Combines data from both layers with only overlapping regions remaining, combines attributes of both layers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
What is a union
includes all data from both inputs, including attributes
26
What is a problem with vector overlay
boundary issues
27
What happens with line-in-polygon?
only arcs found within th ebase layer polygons are included in the output The attributes from the polygon are transferred to the arcs
28
What happens with an intersection?
uses geometric AND to compute the overlapping area, attributes from both polygon are transferred to the output, also called polygon on polygon
29
What happens with a union
uses geometric OR to compute the overlapping area all input features from both layers remain attribute values are assigned by containment attribute inheritance, polygons only
30
What happens with a symmetrical difference
using XOR will output polygon areas that do not overlap
31
What happens with a clip
attributes from the clip layer are not transferred to the output
32
What are the 8 types of vector overlay
``` Dissolve append/merge union clip identity intersect update erase ```
33
What happens with a dissolve
removes boundaries between polygons or nodes between arcs, features with same attributes are dissolved
34
What happens with an identity
all featurs from first input layer persist keeps its identity attributes from both layers exist where there is overlap order of inout and overlay matters polygon on polygon, line, or point
35
what happens with an update
all features exist in output the update coverage features replace the area they overlap in the input coverage underlapping features from input are erased attributes only from input layer exist in output order of input and overlay matters
36
What happens with a clip
cookie cutter only input layer features and attributes exist in output polygon on polygon, line or point
37
what happens with an erase
cookie cutter, only input layer features and attributes exist in output, order of input and overlay matters, polygon on polygon, line, or point
38
What happens with a split
divides the first inout layer into a number of smaller layers based on the second input layer the name of the output feature classes will be the same as the split fields unique values
39
What is a buffer?
A proximity function, a region that is less than or equal to a specified distance from a feature
40
What are the types of buffers
fixed buffers dissolved buffers compound buffers nested buffers
41
what is cartography
the art and techniques of making maps
42
What are the map purposes
audience info to communicate area of interest presentation medium
43
types of thematic maps
point symbol, area symbol, dot maps, proportional symbol, area class, flow line maps, choropleth maps, isoline, grid based map, cartograms
44
What are the visual variables in symbology and labeling
shape, hue, orientation, value, size, texture
45
how is color expressed?
as an RGB triplet, each component can vary from zero to 255 maximum value. 0 will be black and all 255 will be white
46
ArcMap can define color in what models?
RGB, CMYK, HSV, gray, names
47
A 2 class map can be suitable for
binary data or data with positive and negative values
48
4 to 8 classes in a map usually ensure that map readers can
see distincr patterns and can match color hue, lightness, and saturation on the map to the legend
49
More than 8 classes will produce
more complex patterns and map readers may not be able t match the used colors to the map legend
50
Classification should...
maximize the between class differences and minimize the within class differences
51
what are the five ways to classify raw data
``` unclassified natural breaks equal intervals quantiles unique scheme ```
52
What is the natural breaks classification
finds existing groups of values in the data and puts them together, using natural gaps in the data. It works well on unevenly distributed data
53
What is the equal interval classification
the class system takes the range of values in the field and divides them into a specified number of classes of equal size. very useful for ratio data
54
What is a quantiles classification
put about the same number of features in each class, this method creates a very balanced map with all classes equally well represented but some of the classes may be very close together in terms of their values
55
What are the concepts of raster data structures
grid often has its origin in the upper left corner, single values associated with each cell, rules needed to assign cell value to object that does not cover entire cell
56
what is raster data resolution
the minimum linear dimension of the smallest unit of geographic space for which data are recorded
57
What three fields are always present in the grid attribute table
the objectid, the value field, and a count field indicatinf how many cells contain that value
58
what is an artifact
an anomaly in the data
59
What are discrete rasters
essentially store features but in raster format, have relatively few values that change abruptly from one category to another
60
How can you display raster data
thematic rasters, image rasters
61
What is cell size
length or width of a cell on the ground
62
What is extent
area that a raster represents on the ground
63
Whats in a cell?
each cell can have zero, one, or multiple values, but no cell can be empty, values can be numeric or text

GIS (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions