Hämotherapie

Empirical assessment of multi-wavelength synthetic aperture radar for land cover and canopy height estimation

“…). The NED data, for example, is constantly being updated (approximately 15% each year;Maune, 2009) with highresolution LiDAR or photogrammetric data and should improve in accuracy over time.The results o f the vertical accuracy assessment of NED against NGS reference data showing better vertical accuracy than that published (U.S. Geological Survey, 1997;Gesch et al, 2002) may be indicative of these improvements. These findings also concur withSmith and Roman (2001) who compared NED elevations to NGS control and achieved a RMSE o f 2.72 m. Thus, the findings presented in this research indicate that the NED offers a suitable (and freely available) DTM for use in canopy height generation for sites with similar characteristics to those o f this research.…”