1
Q
What do attribute tables store
A
data associated with a spatial feature class
2
Q
what do standalone tables store
A
tabular data from any source: excel, text files, CSV files, and data base files
3
Q
what is x and y in arc GIS
A
X is Longitude and Y is Latitude
4
Q
how to correctly name a field in excel for arcGIS
A
- field name MUST begin with a letter
- only use letters, numbers, and underscore
- 10 letters in a name is BEST, no more than 64 characters allowed
5
Q
what is a boolean operator
A
logical operator used in the formulation of a boolean expression
6
Q
examples of boolean operators
A
AND –> combo of conditions (A and B)
OR –> specifies list of alternative conditions ( A OR B)
XOR –> mutually exclusive
NOT
7
Q
what is NOT boolean connector
A
AT LEAST
8
Q
what is selection by location used for
A
spatial data query
9
Q
what is selection by attribute used for
A
attribute data query
10
Q
when is boolean connector AND used for
A
INTERSECT operation on sets ( see paper)
11
Q
when is boolean connector OR used
A
UNION operation on setshat
12
Q
what does target layer contain
A
FEATURES to be selectedw
13
Q
what does source layer contain
A
contains the features being compared to (where query results will be found in relation to)
14
Q
what are rows called in tables
A
RECORDS (and represent an individual geographic feature)
15
Q
what are columns called in tables
A
FIELDS
16
Q
where does information go in a JOIN
A
the TARGET table recieves the additional information
17
Q
what is a rule with join
A
each record in the target tables must match ONE and ONLY ONE record in the join table
18
Q
what cardinality exist for joins
A
one-to-one and many-to-one cardinality (NOT ONE-TO-MANY!)
19
Q
example of attribute queries
A
test TABLE VALUES –> e.x. populations greater than 100,000
20
Q
example of spatial queries
A
test spatial relationships –> e.x. parcels that are in a flood plain
21
Q
what is an interactive query
A
the USER visually identifies the desired features in a map or records in a table
22
Q
what are arithmetic operators
A
+ - x / ^ (act on numbers)
23
Q
what are logical operators)
A
> < = _< _> (test conditions and return true or false)
24
Q
what are spatial operators
A
intersect contains proximity –> test spatial relationships between features
25
how are expressions executed
Structured Query Language
26
what do spatial queries test
spatial relationship between two layers --> counties that contain volcanoes OR counties that intersect rivers
27
what are the three basic operators that test spatial relationships
- INTERSECT (whether features touch)
-CONTAINS/WITHIN (whether feature is inside another)
-PROXIMITY (whether features are within a specified distance of another)
28
what does the CONTAINS operator do
permits the feature to lie on the edge of (share a boundary with) the containing feature
29
what does the completely contains operator use
does NOT permit a shared boundary
30
what is topology
refers to the spatial relationships between features
31
what is the first step of editing
CREATE new feature class to hold the new features
32
what is in the create features pane
contains templates that specify basic settings and provide different types of construction tools
33
what is in the modify features pane
Moving, Scaling, Rotating, and Aligning
34
what is in general editing menu
COPY or DELETE features
35
what are overlay tools
either helps to intersect, erase, or union overlay features --> see paper
36
what is union more specifically
combines area extents from BOTH input layers --> both must be polygon layers
37
what does the intersect overlay method do
preserves only the common are of both the input and overlay layers
38
what does dissolve tool do
remove boundaries between polygons that have the same value of a select attribute
39
what is a buffer
a region of spatial proximity computed around one or more objects in a layer
40
what is a buffer for a point
a circle
41
what is true about buffering
- you can buffer with different buffering distances
- you have the options of creating a single ring or multiple rings
- you can either dissolve the buffer zones or keep the buffer zones separate
42
what is the clip geoprocessing tool
it will extract the features of one layer based on the shapes of features in a second layer
--> MUST identify polygon layer to define area for clipping (see paper)
43
what is XOR boolean operator do
creates symmetrical difference overlay method (exclusive, see paper)
44
what is true about arcGIS if shapefiles used as input layers
does NOT automatically update area and perimeter values
45
how to take map from land use classes of urban, agricultural, commercial etc. to only agricultural land use?
use SELECT operation for new map
46
what is language in arcGIS
python
47
how is error propagation in overlay operations caused
1. inaccuracies of attribute data
2. digitizing errors
48
what happens if "no data" assigned to raster cell
grid cell has NO VALUE
49
what raster cell size has lower resolution
LARGER cell size has LOWER resolution
50
what is cell area, if cell resolution is 30 meters
cell in the raster measures 900 square meters
--> 3x3 10m raster grid covers an area of 900 square meters (30m by 30m)
51
what pixel depth is more info storage
higher cell depth (e.x. 16 bit) means stores more info than lower cell depth (e.x. 8 bit)
52
what are satellite images comprised of
multiband rasters
53
what is vectorization
converting raster to vector (polygon feature class)
54
what is necessary when polygon shapefile converted from vector into a raster
an attribute from the shapefile's attribute table must be chosen for the cell value of the raster
55
what is combine operation
within raster --> can assign unique output value to each unique combination of cell values from multiple rasters
56
what is the mosaic technique
used to knit several raster datasets together into one raster
57
what is spatial analyst extension in arcGIS
used for dealing with raster data tools and derivations
58
how is area extent for raster analysis specified
1. specified raster
2. area defined by minimum and maximum values in x- and y- coordinates
3. analysis mask
59
what can be used to extract data from existing raster
- polygon shapefile
- a circle
- a query expression
60
what are advantages of raster data over vector data
- raster data model is simpler
- overlay is much simpler with raster data than vector data
- raster data is much better suited for representing phenomena with a high spatial variability than vector data
61
what is vector data better suited for
representing topological relationships
62
what mathematical functions can be used for local operations
arithmetic, logarithmic, and trigonometric
63
what is spatial resolution for newer satellite images
1 meter or less
64
where is highest level of vertical accuracy found
in the 1/9 arc-second DEM
65
datasets for excel vs. csv files
for excel --> one dataset for each sheet OR table
for csv --> ONLY one dataset per sheet
66
what file types work for arcGIS
.csv , .txt , .xlsx
67
where do field names come from
the first row in each column of the arc GIS worksheet
68
correct excel and csv formatting
- remove unnecessary text and empty rows above headers
- remove empty rows between headings and the first row of data
- remove calculated columns or rows, new fields can be calculated AFTER data added
- ensure all data in column is single type
!! if mixed data types, content is identified as strings
69
how to do joins in arcGIS pro
string values to string values, numeric to numeric
--> ADD JOIN tool through:
1. Right-Click method: highlight layer's name in the content pane, right-click, and choose joins and relates --> add joins
2. Geoprocessing pane method: from the analysis tab in the ribbon, click tools to open geoprocessing pane --> add join tool
70
what is join tool
a virtual connection between the tables: attributes of the underlying files aren't updated
71
what is arcGIS pro project
project is a body of related work that may include maps, scenes, layouts, connections to resources such as system folders and databasesw
72
what are project file extensions
.aprx
73
where are projects stored
in its own folder along with an associated file geodatabase and toolbox
74
what are main parts of arcGIS pro
ribbon (top field with viewing options), contents pane (on the left), big center map pane, and catalog pane and others (on the right),
75
what are ribbons in arcGIS
arcGIS is ribbon based application
--> tabs on ribbon change depending on type of item you're working with
--> horizontal ribbon, organizes FUNCTIONALITY in series of tabs
--> some core tabs some contextual tabs
76
what are VIEWS in arcGIS
windows for working with maps, scenes, layouts, tables, charts, catalog and other representations --> multiple can be open at once
77
what is a PANE in arcGIS
window displaying contents of a view (contents pane), items in project or active portal (catalog pane), or commands and setting for functionality (symbology or geoprocessing pane)
78
what are layouts in arcGIS pro
page layout is collection of map elements
--> map frames, scale bar, north arrow, map title, legend
--> layouts help to have elements be selected, moved, resized
--> options of landscape (wide) and portrait (tall)
79
NHGIS data
unzipping downloaded files as .csv table files, GIS files (shapefiles) must be unzipped twice
--> AMERICAN COMMUNITY SURVEY data, work with Estimate "E" data and ignore Margins of Erros (M) data
--> descriptions found in codebook.txt file
80
map labeling conventions
position of point feature labels: top or bottom ON THE RIGHT
--> uppercase label on area features
--> labels should not be smaller than 6-7 pts on print and 9-10 on screen
81
fonts for cultural/physical features
cultural --> SANS SERIF FONT
physical --> SERIF FONTS
!! water features in BLUE and in ITALIC font
ENVS380 - GIS
flashcards
Decks in class (10)
# Cards
