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Our previous studies using airborne lidar data have shown that the tree height indices derived from the GLAS and LVIS waveforms were highly correlated. The quartile waveform energy heights derived from GLAS and LVIS data showed significant correlations too. Because of these correlations and the fact that airborne lidar data has been shown to be an accurate(More)
Forest aboveground biomass (AGB) was mapped throughout China using large footprint LiDAR waveform data from the Geoscience Laser Altimeter System (GLAS) onboard NASA's Ice, Cloud, and land Elevation Satellite (ICESat), Moderate Resolution Imaging Spectro-radiometer (MODIS) imagery and forest inventory data. The entire land of China was divided into seven(More)
Reputation systems are having increasing influence on guarding P2P networks. However, reputation systems themselves are vulnerable to attack. Due to the nature of aggregating ratings, the reputation scores of certain peers can be manipulated intentionally by adversaries. In this paper, we report the discovery of a novel attack, named RepHi (Reputation(More)