GNSS
Spatial Data Models
Digitizing
Attributes
General GIS
100
Space, Control, User
What are the GPS Segments?
100
This spatial data model type best represents discrete objects.
What is a vector?
100
This was the most common storage medium of GIS data and maps until the 1980s.
What is hardcopy/paper medium?
100
This structure, often arranged in rows and columns, records non-spatial characteristics that describe spatial entities.
What is an attribute table?
100
This product is the most common output of a GIS.
What is a map?
200
Errors occur because the speed of light varies as it travels through this.
What is the atmosphere. What is the ionosphere.
200
This spatial data model best represents continuous objects.
What is a raster?
200
This type of digitizing error happens when a node does not quite reach the line or other node it intended to reach.
What is an undershoot?
200
This attribute category implies a ranking, or order, by attribute values.
What is an ordinal category?
200
These six parts compose a geographic information system.
What are hardware, software, data, people, methods and network?
300
The difference between where a satellite is located and its reported location.
What is ephemeris error.
300
This spatial data model requires the start node and end node to be at the same coordinate.
What is a polygon?
300
This process automatically sets nearby points to have the same coordinates.
What is snapping?
300
This attribute category represents attributes that have both a rank order and magnitude.
What is an interval/ratio attribute category?
300
This is the art and science of map making.
What is cartography?
400
This type of GPS system requires a base station receiver to be set up at a known location that sends error corrections to a rover receiver.
What is differential GPS?
400
This number represents the area covered on the ground by one cell of a raster.
What is the raster resolution?
400
This type of digitizing process is good for large projects, works well with a large number of elements on a map, but requires strongly contrasting colors to work well.
What is automatic digitizing?
400
This common GIS operation selects a subset of records based on values of specific attributes.
What is a table/attribute query?
400
This type of scale shows a small geographic area.
What is a large scale?
500
This process determines a location based on measurement of distances.
What is trilateration.
500
This spatial data model is composed of points, edges and faces.
What is a Triangulated Irregular Network?
500
Not really used that often today, this device from the past was the precursor to heads-up digitizing.
What is a digitizing table?
500
This attribute data type represents decimal numbers, such as: 5.21 or -16.78.
What is a float?
500
This mathematical model (having two dimensions) serves as a basis for mapping the Earth.
What is an ellipsoid?