Bathymetry by fusion of airborne Laserscanning and multi-spectral Aerial Imagery

河流、湖泊和沿海地区水下底面的测深数字高程模型（DEM）通常由舰载声纳设备测量。这既昂贵又耗时；此外，探空船不能在浅水区作业。因此，迫切需要应用摄影测量和遥感的方法，这些方法可以快速、几乎无缝地获取大面积的数据。这些技术大致可以分为两类：机载或空间图像分析和使用绿色激光的机载激光扫描（ALS）。通常只应用其中一种技术；然而，每种方法都有其优点和缺点。在这个项目中，我们的目标是将ALS数据与从同一载体同时捕获的多光谱或高光谱图像融合在一起。互补的测量原理在一定程度上使得水下底板的DEM更加完整和准确。这种融合应基于考虑上下文的统计方法进行。

Bathymetric Digital Elevation Models (DEM) of the underwater floor of rivers, lakes, and coastal areas are usually measured by ship-based sonar devices. This is both costly and time consuming; furthermore, the sounding vessels cannot operate in shallow waters. Hence, there is a great demand to apply methods of Photogrammetry and remote sensing, which enable acquiring rapidly and almost seamlessly data of vast areas. These techniques can roughly be sorted into two groups: analysis of airborne or space borne imagery and airborne laser scanning (ALS) using a green laser.Usually exclusively one of those techniques is applied; however, each method comes along with its advantages and shortcomings. In this project, we aim at fusion of ALS data and multi- or hyper-spectral imagery that are captured simultaneously from the same carrier. The complementary measurement principles allow to a certain degree to yield more complete and ac-curate DEM of the underwater floor. This fusion shall be conducted based on a statistical approach, which considers context.