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ARCGIS NEW MIDTERM TEST WITH CORRECT ANSWERS 100% VERIFIED
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ARCGIS NEW MIDTERM TEST WITH CORRECTANSWERS 100% VERIFIED
vector vs. raster data
Vector uses points, lines, and polygons to model real world phenomena, in form of
Shapefile or file geodata base - 3D representation of real world objects
How can local governments use GIS to enhance urban infrastructure and services?
Data collection/integration, spatial analysis, developing/planning/managing, emergency
response, transparency with public
-can monitor the data overtime, evaluate effectiveness of policy
-data-driven decision-making - optimize planning and development, community
engagement and transparency
Raster A series of equally spaced and sized grids to conceptually represent spatial
data. Useful for modeling and measuring. Large scale datasets, 2D, quantities or codes
cells often referred to as "pixels" ex. Soil type, land cover, elevation
Geographic coordinate system
- determines exact position of point on earth using lines of latitude (E/W with equator)
and longitude (N/S from poles)
-measures in degrees, minutes, and seconds and ties coordinate values to real locations
on earth
-datum is one parameter, used by google earth and google maps
projected coordinate system
- plane coordinate system that is based on a map projection, covers spherical
coordinates (degrees) to planar - measured in units like meters or feet
-uses mathematical equations to represent 3D shape of earth in 2D surface cones,
cylinders, and planes
, Differences between GCS and PCS
GCS is needed for data to know exact location on earths surface, and PCS is needed to
draw data on a flat map
taxonomy of maps and flowchart
mental maps- hand drawn
tangible maps- grid, drawn, more specific than mental though
base/reference map-small and show important physical features in an area - easy to
read and understand
virtual/thematic-focus on themes and phenomenons like population density or rainfall
and show the relationship of a theme and the underlying physical space
virtual/thematic/qualitative- show spacial extent of categorical/nominal data like soil
type, political districts, or land cover
virtual/thematic/quantitative- (single and multivariable) spatial patterns of numerical
data such as age, population, data, income - ratio scale, internal, and ordinal data
OpenGIS
Increasingly important, opportunity to democratize geographic information for
government and institution transparency and social, economic and environmental
opportunities
-open geospatial data forum, started in 1994
types of tables
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