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GIS > GIS 1 > Flashcards

GIS 1 Flashcards

1
Q

Vector

A

A spacial data storage method in which features are represented by one or more pairs of x-y coordinate values forming points, lines, or polygons

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2
Q

Raster

A

A data set composed of an array of numeric values, each of which represents a condition in a square lelement of ground.

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3
Q

Georeferenced

A

A spacial data layer that is tied to a specific location on the earth’s surface for display with other data.

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4
Q

Feature

A

A spacial object composed of one or more x-y coordinate pairs and having one or more attributes in a single record of an associated table.

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5
Q

Point

A

A one dimensional feature defined by a single x-y coordinated pair.

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6
Q

Line

A

A spacial feature composed of a string of x-y coordinate vertices and used to represent linear features such as streets.

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7
Q

Polygon

A

a closed two dimensional area feature defined by three or more x-y coordinate pairs.

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8
Q

Node

A

The beginning and end point of a line feature.

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9
Q

Vertex vertices

A

A point at which the segments of a line or polygon feature change direction.

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10
Q

Feature class

A

A set of similar objects with the same attributes stored together in a spatial data file.

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11
Q

Attributes

A

Information about map features stored in columns of a table.

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12
Q

FID

A

Feature ID - a unique number assigned to every feature in a spatial data file and used for identification and tracking.

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13
Q

OID

A

Object ID - Unique number identifying a row in a table or a feature in a geodatabase feature class.

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14
Q

Feature Data Set

A

A set of feature classes in a geodatabase that share a common coordinate system and can participate in network and topology.

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15
Q

Thematic Mapping

A

Displaying the features of a spatial data layer based on values in its attribute table.

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16
Q

Spaghetti Model

A

A model that stores spatial features as a series of x-y coordinates and does not store topological relationships between features.

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17
Q

Topological model

A

A data model that stores spatial relationships between features in additional to their x-y coordinates.

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18
Q

Adjacency

A

A spatial condition that quantifies whether one feature touches another.

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19
Q

Connectivity

A

A property of linear features when they are connected to each other via junctions.

20
Q

Overlap

A

A spatial condition that quantifies whether one feature covers all or part of another feature.

21
Q

Intersection

A

The property of two features touching each other in whoole or in part.

22
Q

Logical consistency

A

A measure of how well data features represent real-world features, in particular with respects to topology.

23
Q

Cell Pixel

A

A square data element in a raster corresponding to one value representing conditions on the ground.

24
Q

Discrete

A

Data that take on a relatively small number of distinct values.

25
Q

Continuous

A

Data that take on a variety of different values and that change rapidly across a data set, such as elevation.

26
Q

Resolution

A

The ground area represented by one cell value in a raster. The default storage precision of a vector data set.

27
Q

Precision

A

The number of digits allotted to store a numeric value.

28
Q

Metadata

A

Information stored about data to document its source, history, management, uses, and more.

29
Q

dBase

A

A data program whose file format has been adopted for the shape file data model and tables in ArcGIS.

30
Q

Multipart feature

A

A single feature composed of non touching units, such as a single state feature composed of the seven Hawaiian islands.

31
Q

network topology

A

An association of linear edges and connecting points, used to model the flow of a commodity, such as traffic or utilities.

32
Q

planar topology

A

Planar topology an association of feature classes in a feature dataset, established by rules regarding the spatial relationships between features, such as not overlapping each other.

33
Q

domains

A

A rule that determines the values that may be entered into an attribute.

34
Q

datum

A

A combination of an earth ellipsoid and a reference point to reduce mapping discrepancies for a particular region.

35
Q

coverage

A

The spacial data format created for, and used by, ArcInfo.

36
Q

image service

A

An Internet map layer that is available for viewing but that cannot be downloaded for local storage by the user.

37
Q

feature service

A

An Internet map layer in which the actual feature may be downloaded by the user and saved locally.

38
Q

folder connections

A

(1) A link in ArcCatalog and ArcMap that points to a folder with GIS data and serves as a shortcut to frequently used folders; (2) a link to a DBMS allowing data to be transferred.

39
Q

thumbnail

A

A small snapshot showing the appearance of a data layer and displayed in ArcCatalog to aid the user in finding data.

40
Q

Table of Contents

A

The ArcMap window that lists the data frames and layers in the map document.

41
Q

data frame

A

Container holding layers that are viewed and analyzed together, a map view

42
Q

layer

A

A reference to a feature class and its associated properties.

43
Q

layer file

A

A file that stores a pointer to spatial data along with information on how to display it.

44
Q

scale range

A

The range of scale for which a data layer will be displayed, set by the user to avoid clutter, or the display of layers at inappropriate scales.

45
Q

digital elevation model (DEM)

A

A raster array of values representing elevations at earth’s surface.

46
Q

digital raster graphic (DRG)

A

A scanned image of a USGS topographic map.

47
Q

geographic coordinate system (GCS)

A

A spherical coordinate system of degrees of latitude and longitude that is used to locate features on the earth’s surface.

GIS (3 decks)

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