Ch 5 Flashcards
Two types of vector data formats are _____and ____
geodatabase and shapefiles
Choose all possible answers - which methods are used to extract or subset data from a dataset?
queries
manual selection
project
clip
manual selection, clip
T or F
Streaming data or GIS web services are datasets stored on your local computer
F
T or F
Shapefiles consist of more than one file
T
Shapefiles consist of, at minimum, a .shp, .dbf, and .shx
A _______can be a point, line, or polygon and represent an vector object or location on a map
feature
A __________stores feature classes that have the same coordinate system and the same spatial extent
Feature dataset
A _________ is a homogeneous collections of features with a common spatial representation and set of attributes stored in a database table, for example, a line ________representing road centerlines.
feature class, feature class
A ______ is the native data structure for ArcGIS and is the primary data format used for editing and data management.
geodatabase
What corresponds to or can be represented by a shapefile?
feature class
_____ are vector feature classes developed for the early version of ArcView and have been carried over into ArcGIS.
Shapefiles
______ (TIFF) commonly used for air photos
Tagged Image File Format
What is a collection of related feature classes that share a common coordinate system
Feature Dataset:
What is a homogeneous collection of common features, each having the same spatial representation—such as points, lines, or polygons—and a common set of attribute columns (e.g., a line ________ representing roads)
feature class
What is the difference between a feature class and a feature dataset?
A feature class is collection of common features, each having the same spatial representation—such as points, lines, or polygons—and a common set of attribute columns. A feature dataset is a collection of related feature classes that share a common coordinate system
______ displays addresses on a map by matching postal data fields in a table to a street data set
Geocoding
_____ are used to extract data using an expression based on an attribute field
Queries
A _____extracts features within a bounding polygon from another feature class
clip
An _____extracts the features outside of a bounding polygon from another feature class
erase
_____combines all features from two or more data sets into a single new feature class
Merging
In what circumstances does merging work best?
When two adjacent feature classes have attribute tables with the same fields
_____ removes boundaries of features with the same value in the specified attribute field(s)
Dissolving
Give 3 examples of data types used in ArcGIS
shapefiles, tiffs, geodatabases, database connections, layer files, tables, TIN, CAD drawings
A _____file references a feature class and stores information about its properties, such as how it should be displayed.
layer
______are the recommended model for storing spatial information for ArcGIS.
Geodatabases
______are vector feature classes developed for the early version of ArcView and have been carried over into ArcGIS.
Shapefiles
The ______ is designed to handle the storage of discrete
objects on the earth’s surface, such as sampling sites, roads, or parcels.
vector data model
Name 2 benefits of the vector data model:
It can store the location and shape of individual features, the linked attribute table provides great flexibility in the number and types of attributes that can be sorted out each feature, the vector model is ideally suited to mapmaking because of high precision and detail features that can be obtained, it is a compact way of storing data
Name one drawback of the vector model
Poorly adapted to storing continuous surfaces such as elevation or precipitation
some types of analysis are more time-consuming to perform with vectors than they are with rasters
What two types of vector models exist
The spaghetti model and the topological model
D blank model stores features as independent objects unrelated to each other
Spaghetti
The blank data model stores features but it also contains information about how the features are spatially related to each other
Topological
