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My research interests
Forest biometrics
The traditional topics in forest biometrics are
models for site and stocking, modelling of tree and stand growth,
modelling ingrowth and mortality, allometric relationships of trees,
taper curves and volume models, and diameter distributions. I have
conducted and I am currently conducting some research on these topics.
My special interest is utilizing of sample measurements to improve
the predictions from these models, by using the best linear (unbiased)
predictor (BLP or BLUP). This terminology is closely related to
mixed-effects models, but can be geberalized also to other models.
Diameter distributions
With diameter distributions my main interests are
(i) how to take into account
the mathematical relationships of stand variables and the diameter
distribution into account in modelling, (ii) how to improve the
prediction by using sample information, and (iii) modelling of percentile-based
diameter distribution.
Forest planning
My research on forest palnning is related to the
most effective and cost-efficient use of the forest data in planning.
In addition, I am supervising theses on the effects of different
sources of inaccuracy to the quality of a forest plan.
Remote sensing
My earlier research and PhD was about modelling
forest stand structure, and especially tree size (=diameter distribution)
and basic allometric relationships among trees of a stand (H-D curve).
Together with some additional models (that for spatial pattern of
tree locations and allometric relationships between tree size and
crown properties), they essentially define probabilistic properties
of a three-dimensional object called forest stand. In remote sensing,
we are taking either two or three-dimensional observations from
this object. Thus, my initial interest on forest stand structure
has led me to think of the remote sensing as taking observations
from a realization of a model for the forest stand.
Collaboration
In addition to the collaboration with the researchers
of my own Faculty, I have national research collaboration with University
of Jyväskylä (department of statistics), University of
Helsinki (Department of forest resource managenment), University
of Joensuu, department of mathematics, and the Finnish Forest Research
Institute. My most active international collaborators are at the
University of Jaume (Spain), Yale University (CT, USA) and Virginia
Tech (VA, USA). I also have some more or less active collaboration
with several other national and international organizations.
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