RNR 2102 Exam 2 || All Questions Answered Correctly.
GIS correct answers Geographic Information System
GPS correct answers Global Positioning System
PDOP correct answers Positional Dilution of Precision
NAD27 correct answers North American Datum 27
NAD83 correct answers North American Datum 83
WGS84 correct answers World Geodetic System 1984
UTM correct answers Universal Transverse Mercator
DEM correct answers Digital Elevation Model
DOQQ correct answers Digital Orthophoto Quarter Quadrangles
SA correct answers Selective Availability
DGPS correct answers Differential Global Positioning System
WAAS correct answers Wide Area Augmentation System
TMDL correct answers Total Maximum Daily Load
LiDAR correct answers Light Detection and Ranging
GIS is a computerized system for making maps. T/F correct answers False
GIS is a tool for storing maps and pictures. T/F correct answers False
GIS is a computer-based system to store, manipulate, and output geographical data. T/F correct
answers True
GPS units used by the military have higher PDOP than normal GPS units. T/F correct answers
False
GPS works better during the day, when the clouds help improve the signals. T/F correct answers
False
GPS cannot work at all in the forests, even if the canopy is sparse. T/F correct answers False
, The signals we obtain with normal GPS today contain random error introduced by the military.
T/F correct answers False
Post-processing requires special kind of GPS called Differential GPS. T/F correct answers False,
Differential GPS is instantaneous, while post-processing is afterwards, sitting down at a
computer
Measurements of Cartesian coordinates are in meters. T/F correct answers True
Measurements of geographic coordinates are in degrees. T/F correct answers True
DOQQs are digital aerial photographs. T/F correct answers True
A raster model consists of pixels and therefore can require a large amount of storage. T/F correct
answers True
A vector model consists of objects (points, lines, polygons) that take up less storage. T/F correct
answers True
Metadata are a huge database that consists of both vector and raster models. T/F correct answers
False
Selective availability allows the GPS user to select the proper frequency (L1 or L2). T/F correct
answers False
What is GPS? Explain the basis of GPS and how it works. correct answers A global navigational
satellite system designed by the Department of Defense. Uses constellation of 30 satellites, needs
4-7. Triangulates users position. Very accurate time keeping needed.
What are measurement offsets? correct answers Measure distance and direction from a known
location to an object of interest
What range should you ideally attempt to maintain PDOP within? correct answers 4 or less
The process of first collecting GPS data in the field and later applying corrections to those data is
often termed __________. correct answers Post processing
What is selective availability? correct answers Before 2000, commercial GPS signals were
scrambled to limit precision to approx. 100m.
What is multipath error? correct answers Signals reflecting off obstructions before reaching GPS
Why are survey-grade GPS more accurate than commercial-grade GPS? correct answers They
are capable of receiving both L1 and L2 signals.
Differential GPS
GIS correct answers Geographic Information System
GPS correct answers Global Positioning System
PDOP correct answers Positional Dilution of Precision
NAD27 correct answers North American Datum 27
NAD83 correct answers North American Datum 83
WGS84 correct answers World Geodetic System 1984
UTM correct answers Universal Transverse Mercator
DEM correct answers Digital Elevation Model
DOQQ correct answers Digital Orthophoto Quarter Quadrangles
SA correct answers Selective Availability
DGPS correct answers Differential Global Positioning System
WAAS correct answers Wide Area Augmentation System
TMDL correct answers Total Maximum Daily Load
LiDAR correct answers Light Detection and Ranging
GIS is a computerized system for making maps. T/F correct answers False
GIS is a tool for storing maps and pictures. T/F correct answers False
GIS is a computer-based system to store, manipulate, and output geographical data. T/F correct
answers True
GPS units used by the military have higher PDOP than normal GPS units. T/F correct answers
False
GPS works better during the day, when the clouds help improve the signals. T/F correct answers
False
GPS cannot work at all in the forests, even if the canopy is sparse. T/F correct answers False
, The signals we obtain with normal GPS today contain random error introduced by the military.
T/F correct answers False
Post-processing requires special kind of GPS called Differential GPS. T/F correct answers False,
Differential GPS is instantaneous, while post-processing is afterwards, sitting down at a
computer
Measurements of Cartesian coordinates are in meters. T/F correct answers True
Measurements of geographic coordinates are in degrees. T/F correct answers True
DOQQs are digital aerial photographs. T/F correct answers True
A raster model consists of pixels and therefore can require a large amount of storage. T/F correct
answers True
A vector model consists of objects (points, lines, polygons) that take up less storage. T/F correct
answers True
Metadata are a huge database that consists of both vector and raster models. T/F correct answers
False
Selective availability allows the GPS user to select the proper frequency (L1 or L2). T/F correct
answers False
What is GPS? Explain the basis of GPS and how it works. correct answers A global navigational
satellite system designed by the Department of Defense. Uses constellation of 30 satellites, needs
4-7. Triangulates users position. Very accurate time keeping needed.
What are measurement offsets? correct answers Measure distance and direction from a known
location to an object of interest
What range should you ideally attempt to maintain PDOP within? correct answers 4 or less
The process of first collecting GPS data in the field and later applying corrections to those data is
often termed __________. correct answers Post processing
What is selective availability? correct answers Before 2000, commercial GPS signals were
scrambled to limit precision to approx. 100m.
What is multipath error? correct answers Signals reflecting off obstructions before reaching GPS
Why are survey-grade GPS more accurate than commercial-grade GPS? correct answers They
are capable of receiving both L1 and L2 signals.
Differential GPS
