FOREST BIOMETRICS FULL QUESTIONS
AND CORRECT ANSWERS PREMIUM STUDY
GUIDE
●● Which two variables are measured to estimate single tree volume in
large scale photographs?
Answer: Diameter at breast height (dbh) and tree height.
●● What type of mathematical function is used in size class distribution
models?
Answer: A probability density function, often modeled using a Weibull
or normal distribution.
●● Provide an example of bias in dbh measurements.
Answer: Measuring dbh at different heights can lead to underestimation
or overestimation of tree size.
●● What type of sampling design is necessary to use the simplest
formulas for variance and covariance?
Answer: Simple random sampling design.
●● What are the three variables used in variable-density growth and
yield models?
,Answer: Tree density, average tree size, and site index.
●● What is the major difference between a radar satellite and an optical
satellite?
Answer: Radar satellites use microwave signals to measure surface
features, while optical satellites capture images in the visible spectrum.
●● What are the three attributes recorded for each witness tree by
General Land Office surveyors?
Answer: Species, diameter at breast height (dbh), and distance from the
survey line.
●● What two attributes of a stratum are used in stratified random
sampling?
Answer: Stratum size and variability within the stratum.
●● Give two examples of forest attributes distinguishable on black-and-
white infrared photography.
Answer: Tree species differentiation and moisture content.
●● In which direction do vertical objects appear to lean in aerial
photographs due to relief displacement?
Answer: Vertical objects appear to lean towards the valley or lower
elevation.
, ●● What is the difference between accuracy and precision?
Answer: Accuracy refers to how close a measurement is to the true
value, while precision refers to the consistency of repeated
measurements.
●● What is an indicator species?
Answer: A species whose presence, absence, or abundance reflects a
specific environmental condition.
●● What is a keystone species?
Answer: A species that has a disproportionately large effect on its
environment relative to its abundance.
●● How does the accuracy and precision of a GPS measurement depend
on satellite distribution?
Answer: Good satellite distribution provides better triangulation and
reduces errors in location estimation.
●● Will you store GIS data for forest stand boundaries in raster or vector
format?
Answer: Vector format, as it is more suitable for representing discrete
boundaries and attributes.
AND CORRECT ANSWERS PREMIUM STUDY
GUIDE
●● Which two variables are measured to estimate single tree volume in
large scale photographs?
Answer: Diameter at breast height (dbh) and tree height.
●● What type of mathematical function is used in size class distribution
models?
Answer: A probability density function, often modeled using a Weibull
or normal distribution.
●● Provide an example of bias in dbh measurements.
Answer: Measuring dbh at different heights can lead to underestimation
or overestimation of tree size.
●● What type of sampling design is necessary to use the simplest
formulas for variance and covariance?
Answer: Simple random sampling design.
●● What are the three variables used in variable-density growth and
yield models?
,Answer: Tree density, average tree size, and site index.
●● What is the major difference between a radar satellite and an optical
satellite?
Answer: Radar satellites use microwave signals to measure surface
features, while optical satellites capture images in the visible spectrum.
●● What are the three attributes recorded for each witness tree by
General Land Office surveyors?
Answer: Species, diameter at breast height (dbh), and distance from the
survey line.
●● What two attributes of a stratum are used in stratified random
sampling?
Answer: Stratum size and variability within the stratum.
●● Give two examples of forest attributes distinguishable on black-and-
white infrared photography.
Answer: Tree species differentiation and moisture content.
●● In which direction do vertical objects appear to lean in aerial
photographs due to relief displacement?
Answer: Vertical objects appear to lean towards the valley or lower
elevation.
, ●● What is the difference between accuracy and precision?
Answer: Accuracy refers to how close a measurement is to the true
value, while precision refers to the consistency of repeated
measurements.
●● What is an indicator species?
Answer: A species whose presence, absence, or abundance reflects a
specific environmental condition.
●● What is a keystone species?
Answer: A species that has a disproportionately large effect on its
environment relative to its abundance.
●● How does the accuracy and precision of a GPS measurement depend
on satellite distribution?
Answer: Good satellite distribution provides better triangulation and
reduces errors in location estimation.
●● Will you store GIS data for forest stand boundaries in raster or vector
format?
Answer: Vector format, as it is more suitable for representing discrete
boundaries and attributes.
