A study on qualitative assessment of LiDAR based digital orthophotos generation

For the purpose of rapid map updating, an accurate digital orthophotos is very essential to be generated. The introduction of LiDAR technology enables accurate production of Digital Terrain Model (DTM) and Digital Surface Model (DSM) of an area. These datasets can be the input into a digital photogrammetry system to enable automatic generation of digital orthophotos. This paper aims to assess the quality of the digital orthophotos generated from both LiDAR DTM and DSM. It is found that from this study have shown that although the image quality of orthophotos generated from DTM is superior compared to that generated from DSM but the positional accuracy is very much lower.