Chapter 1 Flashcards
Attributes
Information about map features stores in columns of a table.
Cell
A square data element in a rater corresponding to one value representing conditions on the ground.
Client
A device with software that allows it to communicate with an internet server providing data or processing services.
Continuous Data
Data that take on a variety of values and that change rapidly across a data set and be taken anywhere on earth, such as elevation or temperature.
Database
A data construct deigned to store information as tables.
Discrete Data
Refers to data that represent distinct spatial objects with real world boundaries such as houses, roads, or cities.
Feature
A spatial object composed of one or more x-y coordinate pairs and having one or more attributes in a single record of an associated table.
Feature Class
A set of similar objects with the same attributes stored together in a spatial data file.
Generalization
Simplfying a feature in order to store it or display it at smaller scales than it’s source scale
Geometrics Accuracy
The accuracy with which the shape and position of features are represented.
Geoprocessing
Analysis of spatial data layers such as dissolving, intersecting, and merging.
Georeferenced
A spatial data layer that is tied to a specific location on the weather’s surface for display with other data
Home Geodatabase
The geodatabase stored within a project, which serves as the default location for geoprocessing output.
Layer
A reference to a feature class and it’s associated properties.
Line
A spatial feature composed of a string of x-y coordinate vertices and used to represent linear features such as streets.
Locator
A reference data set and rules used to find locations based on addresses, city and state combinations, or other data not already in x-y coordinates.
Logical Consistency
How well the spatial relationships between features in a data set represent the real world relations; an aspect of topology.
Metadata
Information stored about data to document their source, history, management, uses, and more.
Parameter
(1) A specific value associated with map projections that define how the map appears
(2) A variable that serves as an input to a model.
Pixel
A square data element in a rater corresponding to one value representing conditions on the ground.
Polygon
A closed two dimensional area feature defined by three or more x-y coordinate pairs.
Raster Model
Data format used to store Continuous Data; a format used to store data having a regular scale of measurement and a natural zero point, such as precipitation or population.
Resolution
(1) The ground area represented by one cell value in an Raster
(2) The default storage precision of a Vector data set
Scale Range
The range of scales for which a data layer will be displayed, set by the user to avoid clutter, or the displayer of layers at inappropriate scales.
Scene
A three dimensional geographic view achieved by draping map data onto an elevation surface.
Source Scale
The original analog scale or resolution at which a digital data set is converted to digital form.
Thematic Accuracy
The degree to which attribute values represent the true properties in the real world.
Vector
A spatial data storage method in which features are represented by one or more pairs of x-y coordinate values forming points, lines, or polygons
Point
A one dimensional feature defined by a single x-y coordinate pair.
