gis mapping data Flashcards
nominal data
values that name or identify an object, such as a street name
categorical data
data that places objects in unranked groups
numeric data
values stored as numbers rather than as names or categories
unique values map
a map type in which each attribute is assigned its own symbol
ordinal data
data value that indicates rank or ordering system
ratio data
data having regular scale of measurement and a natural zero point, such as percipitation or population
interval data
values that follow a normal scale but have no naturalk zero point, such as degrees or celsius
graduated symbol map
A map with symbols that change in size according to the value of the attribute they represent. For example, denser populations might be represented by larger dots, or larger rivers by thicker lines
proportional symbol map
a map that displays attribute values with marker or line symbols that are proportional in size relaltive to the value of the feature
graduated color map
map that divides numeric datafrom polygon feature class into classes based on value and displays the classes with different colors
choropleth map
maps in which each feature , such as a state, is clored according to values in a data field
normalized data
to divide the values of an attribute field by the total of the field or by the values in another field
dot density map
a map representing attribute values bay a proportional number of randomly placed dots
chart map
map showing several different attributes in shart form, with one chart for each feature
thematic rasters
a raster that contains categorical or nominal data values, such as land use codes or soil types
discrete
data that take on a relatively small number of distinct values
continuous
data that take on a variety of different values and that change rapidly across a data set , such as elevation
unique values
a map type in which each attribute is assigned its own symbol
classified
raster display mathod that divides values into two or more groups based on their numeric values
stretched
a display method that spreads the data values over the entire range of symbols available
slice
to divide the values in a raster into a specified number of even classes
image rasters
raster data layer, usually refering to a raster that displays brightness values, as ina photograph
histogram
a graph showing the number of pixels contained for each data value in a raster
colormap
set of defined colors matched to specific image pixel values, which determines how the image wil appear
classification
assigning features to two or more groups based on numeric values in an attribute fields
Jenks method
a way to classify numeric data into ranges defined by naturally occuring gaps in the data histogram
equal interval
a classification method in which the user specifies a number of classes that have equal size ranges
defined interval
a classification method in which the user specifies a specific size range range for all the classes
quantile map
map type in which each class has approximately the same number of features
geometric interval
a classification method that bases the class intervals on a geometric series in which each class is multiplied by a constant coefficient to produce the next higher class
standard deviation
a classification scheme in which the class breaks are based on the standard deviation values of the data being mapped
layer
reference to a feature class ad its associated properties
data frame
container holding layers that are viewed and analyzed together; a map view
active frame
the data frame that is visible and responds to changes by the user
source
a location that produces or initiates the flow of a commodity through a network; a spatial data file that provides the featuers for a map layer; the original information used to develop a spatial dataset
pathname
a list of the folders that must be traversed to locate a particular file
absolute pathname
file pathname that starts at the drive letter
relative pathname
path to a file that starts in the current folder
data view
data frame mode optimized for the display and analysis of map data
layout view
a mode of ArcMap that is used to design and create a printed map and that allows manipulation of map layers, titles, scale bars, north arrows, and more
dynamic labels
labels determined from an attribute and placed on a map automatically each time features are drawn and redrawn
pyramids
set of rasters with different resolutions that is calculated from a raster and used to speed displays at smaller displays.In raster datasets, a reduced resolution layer that copies the original data in decreasing levels of resolution to enhance performance. The coarsest level of resolution is used to quickly draw the entire dataset. As the display zooms in, layers with finer resolutions are drawn; drawing speed is maintained because fewer pixels are needed to represent the successively smaller areas.
rgb composite
an image displayed by assigning one band of brightness information to each red, green, and blue color gun in a display monitor
(DRG) Digital Raster Graphic
scanned image of a USGS topographic map
