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54 Cards in this Set

  • Front
  • Back
attribute data
data that describe the characteristics of spacial features
continuous features
spatial features that exist between observations
an ESRI data format for topological vector data
discrete features
spatial features that do not exist between observations, form separate entities, and are individually distinguishable
dynamic segmentation model
a data model that allows the use of linearlu measured data on a coordinate system
geodatabase data model
an ESRI data model that is object-based
georelational data model
a vector data model that uses a split system to store spatial data and attribute data
geospatial data
data that describe both the locations and characteristics of spatial features on the earth's surface
object-based data model
a data model that use objects to organize spatial data and stores spatial data and attribute data in a single system
the process of transforming from a geographic grid to a plane coordinate system
raster data model
a spatial data model that uses a grid and cells to represent the spatial variation of a feature
higher-level vector data that can ave spatially disjoint components and can overlap one another
relational database
a collection of tables, which can be connected to each other by attributes whose values can uniquely identify a record in a table
an ESRI data format for nontopogical vector data
spatial data
data that describe the geometry of spatial features
spatial interpolation
a process of using points with known values to estimate values at other points
a subfield of math that is applied in GIS to ensure that the spatial relationships between features are expressed explicitly
triangular irregular network (TIN)
a data model that approximates the terrain with a set of nonoverlapping triangles
vector data model
a spatial data model that uses points and their x,y-coordinates to construct spatial features of points, lines, and areas (polygons)
azimuthal projection
one type of map projection that retains certain accurete direction- uses a plane as the projection surface
central lines
the central parallel and the central meridian- define the center or the origin of a map projection
Clarke 1866
a ground-measured spheroid, which is the bases for the north american datum of 1927
dude who did cholera experiment in london
John Snow's radical theory
disease was waterborne (community pumps)
geographic visualization
allows us to visualize geographic data in 3D, or thru charts and graphs
spatial queries
allows us to ask where things are in relation to other things
attribute queries
attribute queries allows us to ask questions about the attributed of geospatial features
buffer analysis
allows us to analyze the relationships of objects based on DISTANCE
spatial interpolation
allows us to predict some value at a geographic location that we have not measured
spatial overlay
allows us to determine the relationship between different geographic areas
network analysis
allows us to find a path from one point ot another
terrain analysis
allows us to perform 3D analysis
mathmatical functions
allows us to apply algabraic, geometric, or statistical functions to geographic features
purpose of classification
reduce a large # of individuals to a smaller group (IE high, medium, and low zip codes), make general statements about phemoma
choropleth maps
have distinct color or shading to areas to represent classification
dot-density maps
each dot represents a given amount of data
proportional symbol maps and pie charts
size of symbol varies in proportion to the quantities it represents
area cartogram
polygon distorted so sixe reflects te value of attribute
features that touch target features
based on distances within features of interest
shortest route
dissolve feature
aggregates features tat have the same value for an attiribute that you specify
merge feature
sppends the features of 2 or more themes into a single theme, attributes will be retained if they have the same name- joins two or more themes that meet at a border
overlay feature
combines spatial coordinate and attribute data from 2 or more spatial data layers- vertical stacking and berging of info into a new layer
three types of Overlay
Polygon to polygon, point in polygon, line in polygon
conformal projection
preserves local shapes
conic projection
uses a cone as the projection surface
cylindrical prjection
uses a cylinder as projection surface
equidistant projection
maintains the consistency of scale for certain distances
equivalent projections
represents area in correct relative size
false easting
a value applied to the origin of a coordinate system to change the X coordinate readings
false northing
a value added to the origin of a coordinate system to change the Y coordinate readings
lambert conformal conic projection
a common map projection-basis for SPC system for many states
transverse mercator projection
a common map projection-basis for UTM grid system and SPC system