what is GIS Flashcards
discrete data
objects in the real world with specific locations or boundaries (vector)
continuous data
quantities that can be measured anywhere on earth (raster)
georiented data
info is tied to location using standard coordinates used in geospatial software and data
feature class
set of similar features stored together, must all be the same type of feature
map scale
a measure of the size at which features of a map are represented
source scale
original scale or resolution at which data was created or converted to digital form
scale range
range of scales for which the display of the data is valid
generalization
simplifying data for digital storage, increases as map scale decreases
geometric accuracy
how closely the x-y values correspond to the actual location
thematic accuracy
refers to attributes in the table, never fully accurate
resolution
sampling interval at which data are acquired, spatial, thematic, or temporal
precision
number of sigfigs used to record a measurement or statistical variation of of a repeated measurement
logical consistency
evaluates if data actually represents real world relationships
scene
3D maps
geoprocessing history
the project tracks every tool run so you can reference them
locators
used to convert street addresses to points on a map
contextual ribbons
only appear when appropriate part of the project is selected
pane
type of window that contains command settings used to work with the active view
geoprocessing
using several tools in sequence to accomplish a task
John Snow
found spatial correlation between wells and cholera outbreaks in London in 1854
map overlays
developed in early 1900’s at UPenn dep. of landscape architecture
symbology
used to communicate geographic info
discrete raster
cells have numerical codes that correlate to some categorical value
