This article addresses professionals like foresters, ecologists, project developers, certifiers, and environmentalists (in the following called natural resources managers) who are new to the field of remote sensing or who want to update their basic knowledge.
What will you learn? You will learn to
distinguish between various data collection methodologies,
understand the pros and cons of different data sources, and
select the right data set to answer your questions efficiently.
By Erik Lief
In evaluating the health of living things – whether they be humans, plants or animals – when advanced age or decay sets in we can observe the physical changes as they happen with our own eyes.
The same, however, cannot be said when studying trees. That’s because when they’re stricken by old age or disease, they rot, invisibly, from the inside out. And not knowing their true health misleads foresters and scientists around the globe who track climatic shifts and other natural occurrences.
As a result, foresters, arborists and researchers obtain their tree health data employing an alternative method: sound waves. However, while that method – called sonic tomography – is fascinating and revealing, it has its limitations since previously it could only be deployed on trees with cylindrical trunks.
But a new study, just published in Applications in Plant Sciences, claims to have taken sonic tomography to the next level, where now irregular-shaped trunks, which are predominately found in tropical climates, can be analyzed as well. And according to the research team headed by Greg Gilbert, lead author of the study and Professor and Chair of the Department of Environmental Studies at the University of California, Santa Cruz, evaluating tree decay “is of special concern in the tropics because tropical forests are estimated to harbor 96% of the world’s tree diversity and about 25% of terrestrial carbon, compared to the roughly 10% of carbon held in temperate forests.”