Multi Scale Geomorphological Mapping Using High Resolution Satellite Imagery and Unmanned Aerial Vehicle Imagery

摘要

Geomorphological maps are inventories of landforms traditionally prepared through ground surveying techniques and interpreted from contour lines. The advancement in remotely sensed sensors, air-borne sensors, digital elevation models (DEM), image processing techniques and spatial analysis capabilities have provided opportunities of landforms structures and evolution mapping on various temporal and spatial scales. Most recent developments in this field is the use of unmanned aerial vehicle (UAV) photogrammetry technique which can be used for rapid spatial data acquisition and produces accurate results. This technique has opened new avenues for geospatial scientists to monitor evolution of geomorphological features. This research aims at comparative analysis of hydro-geomorphological features mapping through high resolution satellite images and UAV images. Since the study area is large, the fixed-wing UAV was employed for data acquisition. Hydro-geomorphological features are always dynamic in nature even if the river has steady flow. Hydro-geomorphological features of study area were mapped through two different spatial data sources i.e. using high resolution satellite imagery and UAV imagery. The UAV imageries were processed using ground control points (GCPs) which are established in the study area through dual frequency real time kinematic (RTK.) GPS receiver. This type of inventory of such hydro-geomorphological features can be used as base data for various civil engineering and natural hazard projects.