Airborne LiDAR survey in cloudy and extremely high-relief mountainous terrain of Taiwan

Taiwan is conducting national LiDAR survey for the whole territory. An extremely difficult terrain, namely the Block 2-3, has been surveyed in 2012 where the physiographical and weather conditions are adverse for the airborne missions. Types of gaps for LiDAR point clouds are categorized into 8 types in this study to describe the difficulties encountered. Finally, the critical factors embedded in the re-flight plan are enumerated in this paper. It is concluded that proper flight plan and re-flight plan and strategies adopted are the most important successful factors.