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General performance in oral workshops will be taken into account as appropriate . The working group felt the demonstrated capabilities of imaging radars for investigating terrestrial ecosystems could best be organized into four broad categories : ( 1 ) classification and detection of change in land cover ; ( 2 ) estimation of woody plant biomass ; ( 3 ) monitoring the extent and timing of inundation ; and ( 4 ) monitoring other temporally dynamic processes , such as freeze / thaw status and soil moisture in fire-disturbed boreal forests . Destruction of the lichen or other sparse plant life can lead to extensive damage to the ecosystem through promotion of soil erosion , loss of primary productivity , and destruction of the matted structure of the existing soil . The annual climatological probability of a nadir cloud-free line of sight ( CPncflos ) for laser altimetry or stereo-optical imaging depends on latitude and season . Thus stream-channel geometry is a sensitive indicator of change within a watershed . The most common above-ground symptom of crown and root rot is a rapid yellowing of foliage and dropping of flower buds . If height data are used to assess changes , it is important that basic elevation data be as accurate as possible ( at least 1-m accuracy , preferably 20 cm or better ) to enable accurate assessment of the rate of change after several years of measurements . Heads of Departments and other staff with managerial responsibilities must take into account any temporary ( e.g . When deciding the usefulness of the remote sensing instruments and the inferred soil moisture estimates , one has to take into account the natural spatial variability of soil moisture .