GPS Final (12-7-21) Flashcards
(48 cards)
Something that predicts spatial relationships and portrays objects form the perspective of space.
Map
These individual map themes originally drawn on thin sheets of glass can be placed atop one another on a basemap to depict locations of different things.
Layers
This physician often credited as the creator of the first GIS was able to pinpoint the source of a cholera outbreak in London using a basemap along with plotted points of fatalities.
John Snow
This component of a spatial database is shown in the form of a table to list one or many different trait belonging to a single feature.
Attributes
This feature type is formed from a sequence of at least two coordinates.
Line
Feature type formed by a sequence of paired coordinates where the starting point is also the ending point.
Polygon
Feature type that only has one set of coordinates.
Point
These lines stretch from East to West and are parallel to each other.
Latitude Lines
The agency responsible for handling Mississippi GIS needs including imaging, etc.
MARIS
The building blocks of a raster data model.
Pixels
This dataset uses discreet point-line segments to identify the locations of Earth’s features.
Vector
This dataset is displayed as a matrix of rows and columns and represents the Earth’s features with small consistently sized squares.
Raster
The spatial relationship among features.
Topology
The ______ is the line of 0 degrees longitude.
Prime Meridian
These enable the reshaping of Earth by mathematically transforming the spherical coordinates into a 2-D space.
Projections
This coordinate system was developed by the US Army Corps of Engineers and is made up of 60 North/South oriented zones that are 6 degrees longitude wide.
UTM (Universal Transverse Mercator)
This coordinate system is consistent across the entire US and is utilized after natural disasters.
The US National Grid
This coordinate system divides the US into over 120 zones.
State Plane Coordinate
This defines the size and shape of the Earth and the origin and orientation of coordinate systems designed to map the Earth.
Datum
What is a map’s purpose?
To communicate
Explain the difference between projections, coordinate systems, and datums.
Projections take 3-D Earth and project it to a 2-D surface. Coordinate systems describe the location of a feature and is usually set to a specific projections. Datums describe the shape of the Earth.
The 3 projection services.
- Planar
- Cone
- Cylindrical
The famous London underground map emphasizes ______ position of the terminals.
Relative
This is the most common and easily recognized of the thematic maps.
Choropleth
