RNR 2102 - Exam 2
Given that the dot grids contain 25 dots per square inch, and that the scale of the
map is 4 inches to the mile, compute area in acres of a tract covering 450 dots. -
CORRECT ANSWER-720 ac
Calculate radius of a 0.2-acre circular plot. - CORRECT ANSWER-52.660 ft
Given the following volume table and the total tree tally on 12 plots of 0.1-ac
each, compute trees/acre, basal area/acre, and volume/acre. (see sheet) -
CORRECT ANSWER-Trees/ac = 208.333 trees/ac
Basal area/ac= 53.631 sq.ft./ac
Volume/ac= 12.217 cords/ac
What do the following acronyms stand for? GIS, GPS, PDOP, NAD27, NAD83,
WGS84, UTM, DEM, DOQQ, SA - CORRECT ANSWER-GIS: Geographic
Information System
GPS: Global Positioning System
PDOP: Positional Dilution of Precision
NAD27: North American Datum of 1927
NAD83: North American Datum of 1983
WGS84: World Geodetic System of 1984
UTM: Universal Transverse Mercator
DEM: Digital Elevation Models
DOQQ: Digital Orthophoto Quarter Quadrangles
SA: Selective Availability
T or F? GIS is a computerized system for making maps - CORRECT ANSWER-F
T or F? GIS is a tool for storing maps and pictures. - CORRECT ANSWER-F
T or F? GIS is a computer-based system to store, manipulate, and output
geographical data. - CORRECT ANSWER-T
, T or F? GPS units used by the military have higher PDOP than normal GPS
units. - CORRECT ANSWER-F; military has lower PDOP (small PDOP value is
good)
T or F? GPS works better during the day, when the clouds help improve the
signals. - CORRECT ANSWER-F; clouds do not improve signals; avoid collecting
data in forested environment during/after imm. rainfall
T or F? GPS cannot work at all in the forests, even if the canopy is sparse. -
CORRECT ANSWER-F; can still work just isn't as accurate
T or F? The signals we obtain with normal GPS today contain random error
introduced by the military. - CORRECT ANSWER-F; SA is not used anymore
T or F? Post-processing requires a special kind of GPS called Differential GPS. -
CORRECT ANSWER-F; DGPS is real time (no post-processing);
post-processing uses raw GPS data from base station and post-processing
software
T or F? Measurements of Cartesian coordinates are in meters. - CORRECT
ANSWER-T
T or F? Measurements of geographic coordinates are in degrees. - CORRECT
ANSWER-T
T or F? DOQQs are digital aerial photographs - CORRECT ANSWER-T
T or F? A raster model consists of pixels and therefore can require a large
amount of storage. - CORRECT ANSWER-T
T or F? A vector model consists of objects (points, lines, and polygons) that take
up less storage - CORRECT ANSWER-T
T or F? Metadata are a huge database that consists of both vector and raster
models. - CORRECT ANSWER-F (?)
Given that the dot grids contain 25 dots per square inch, and that the scale of the
map is 4 inches to the mile, compute area in acres of a tract covering 450 dots. -
CORRECT ANSWER-720 ac
Calculate radius of a 0.2-acre circular plot. - CORRECT ANSWER-52.660 ft
Given the following volume table and the total tree tally on 12 plots of 0.1-ac
each, compute trees/acre, basal area/acre, and volume/acre. (see sheet) -
CORRECT ANSWER-Trees/ac = 208.333 trees/ac
Basal area/ac= 53.631 sq.ft./ac
Volume/ac= 12.217 cords/ac
What do the following acronyms stand for? GIS, GPS, PDOP, NAD27, NAD83,
WGS84, UTM, DEM, DOQQ, SA - CORRECT ANSWER-GIS: Geographic
Information System
GPS: Global Positioning System
PDOP: Positional Dilution of Precision
NAD27: North American Datum of 1927
NAD83: North American Datum of 1983
WGS84: World Geodetic System of 1984
UTM: Universal Transverse Mercator
DEM: Digital Elevation Models
DOQQ: Digital Orthophoto Quarter Quadrangles
SA: Selective Availability
T or F? GIS is a computerized system for making maps - CORRECT ANSWER-F
T or F? GIS is a tool for storing maps and pictures. - CORRECT ANSWER-F
T or F? GIS is a computer-based system to store, manipulate, and output
geographical data. - CORRECT ANSWER-T
, T or F? GPS units used by the military have higher PDOP than normal GPS
units. - CORRECT ANSWER-F; military has lower PDOP (small PDOP value is
good)
T or F? GPS works better during the day, when the clouds help improve the
signals. - CORRECT ANSWER-F; clouds do not improve signals; avoid collecting
data in forested environment during/after imm. rainfall
T or F? GPS cannot work at all in the forests, even if the canopy is sparse. -
CORRECT ANSWER-F; can still work just isn't as accurate
T or F? The signals we obtain with normal GPS today contain random error
introduced by the military. - CORRECT ANSWER-F; SA is not used anymore
T or F? Post-processing requires a special kind of GPS called Differential GPS. -
CORRECT ANSWER-F; DGPS is real time (no post-processing);
post-processing uses raw GPS data from base station and post-processing
software
T or F? Measurements of Cartesian coordinates are in meters. - CORRECT
ANSWER-T
T or F? Measurements of geographic coordinates are in degrees. - CORRECT
ANSWER-T
T or F? DOQQs are digital aerial photographs - CORRECT ANSWER-T
T or F? A raster model consists of pixels and therefore can require a large
amount of storage. - CORRECT ANSWER-T
T or F? A vector model consists of objects (points, lines, and polygons) that take
up less storage - CORRECT ANSWER-T
T or F? Metadata are a huge database that consists of both vector and raster
models. - CORRECT ANSWER-F (?)
