Meaningful, reliable and fast estimates of woodland canopy are essential to the characterization of
forest ecosystems. In this document, the accuracy of the technology of hemispherical digital photography and
its comparison with a measuring proposal via vertically-arranged photography is evaluated for the estimation of
canopy porosity in two deciduous tree species: oak and Sweet chestnut. Complementarily, estimative models
are proposed of porosity capacity of the species under study, in function of allometric variables of statistical
weight in tree growth: canopy diameter and DBH (diameter breast height). For the execution of this study an
experimental area of rural character was chosen in the Ambroz Valley, in Cáceres Province (Spain), where
Quercus pyrenaica and Castanea sativa were selected as the most representative species. The data was
gathered in the season with greatest foliage development for both species: the summer. The average tree canopy
porosity obtained via the two methods under evaluation is very similar when compared through regression
analysis (R²=0,919 for Sweet chestnut; R²=0,952 for oak). Therefore both methods would be eligible for
measuring OP of the species proposed for this study. The equivalence of measurements in vertical perspective
as opposed to hemispherical makes viable the use of porosity percentages as indicators of what the average
observer is able to visualize through the canopy. Starting from these preliminary conclusions, it would be
feasible to develop a quantification tool for degrees of filtering with application to landscape planning and
reduction of visual impact. Complementary research on other species could be recommendable in order to
standardize and validate this proposal.info:eu-repo/semantics/publishedVersio
