Tree-heights derived from radar profiles over boreal forests

In this paper, results from helicopter-borne NOPEX-measurements over a bore al forest using a multi-band radar profiler are presented. Comparisons are made between tree-height profiling responses at three different frequency b ands (5, 14 and 35 GHz). Values derived from radar profiles are also compar ed with maximum tree-height, and stem volume per hectare derived from groun d-based measurements made in circular plots below the Eight track. The rang e response of a radar profiler and its relationship to the foliage back-sca ttering and stem volume is modelled and discussed. (C) 1999 Elsevier Scienc e B.V. All rights reserved.