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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


coverage

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 objectbased


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


objectbased data model

a data model that use objects to organize spatial data and stores spatial data and attribute data in a single system


projection

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


regions

higherlevel 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


shapefile

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


topology

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,ycoordinates 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 groundmeasured spheroid, which is the bases for the north american datum of 1927


JOHN SNOW

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


dotdensity 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


adjacency

features that touch target features


proximity

based on distances within features of interest


netwrokbased

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 projectionbasis for SPC system for many states


transverse mercator projection

a common map projectionbasis for UTM grid system and SPC system
