![]() We then argue about the role of remote sensing in forest health monitoring and present the most common VIs used for the assessment of forest health. In this chapter we first discuss the term ‘forest health’ as well as the various causes and symptoms of forest health deterioration. In addition to specific VIs some attempts to develop a general forest health index combining the assessments of the various properties have been published. VIs are combinations of surface reflectances at two or more wavelengths designed to highlight a particular property of vegetation. In the assessment of forest health by means of remote sensing, features called Vegetation Indices (VIs) are usually extracted from the data. Modern state of the art remote sensing technologies provide the means for wide coverage measurement of forest health with reasonable accuracy. ![]() The relationship between the cause and the symptom of forest health deterioration is complex mainly because the same symptom can often be induced by multiple different stressors. Forest health can be defined in many different ways depending on the perspective one takes. There is a need to monitor and quantitatively measure the change in forest health. The main reasons for this unfortunate development include climate change, air pollution and increased human activities.
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