LiDAR DEM generation over Knuckles cloud forest: ground returns and canopy filtering?
What pulse return algorithms and multi-echo filtering separate high-canopy cloud forest foliage from bare bedrock across steep Knuckles escarpments?
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3 Answers from travellers
Airborne LiDAR mapping across the steep, mist-shrouded escarpments of the Knuckles Conservation Zone requires advanced full-waveform laser scanning systems. The dense pygmy cloud forest canopy absorbs and reflects early laser pulses off upper leaf layers. However, roughly 3% of near-infrared laser pulses penetrate through foliage gaps down to the rocky forest floor. Processing software applies progressive morphological filter algorithms to classify and remove vegetation echoes, generating a high-resolution bare-earth Digital Elevation Model (DEM) used to study mountain hydrology and ancient footpaths.
Surveys must avoid periods of heavy mountain fog and cloud-base immersion; suspended water droplets scatter laser energy and reduce ground point density.
Ground control points (GCPs) surveyed with dual-frequency RTK GPS units must be anchored to exposed rock outcroppings to calibrate vertical z-accuracy.
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