This paper presents an automatic road extraction technique that combines information from aerial photos and laser scanning data (LSD). This innovative Road Extraction Assisted by Laser (REAL) can detect the road edges shadowed by surrounding high objects. A new concept of Associated Road Line (ARL) graph from LSD is introduced to enhance Real Road Line (RRL) graph from aerial photos. The extrac...

This study assesses the contribution of LIDAR altimetry, multi-return and intensity information, and aerial photos to coastal wetland investigation. Aerial photos in this area work as reference data to assess the accuracy of the experiment. The performance of Lidar data resources was tested alone with the adaptive TIN algorithms to separate ground points. Multi-return information was employed t...

Large-scale landslides often cause severe damage to lives and properties; therefore, their identification is essential in order to adopt proper mitigation measures. The objective of this study was to set up a methodological approach to help identify large-scale landslides using Lidar data, aerial photos and field investigation. The selected study areas were the Namasha and Liuoguey Areas in Kao...

Bowhead whales (Balaena mysticetus) summering in the eastern Beaufort Sea in 1983 were measured through aerial stereophotogrammetry. Photos were taken from a turbine Aerocommander 690 with wingtip-mounted, calibrated 35-mm cameras. Photos were measured on an analytical plotter with scale data provided by radar altimeter and focal length of the lenses. Coefficient of variation of known-sized tar...

High-resolution ((1 m) satellite imagery and archival World War II era (WW2) aerial photographs are currently available to support high-resolution long-term change measurements at sites across China. A major limitation to these measurements is the spatial accuracy with which this imagery can be orthorectified and co-registered. We orthorectified IKONOS 1 m resolution GEO-format imagery and WW2 ...

the hyrcanian forests have been highly exploited in recent decades by human impacts. easy access, abundance and variety of valuable forest yields have led to population growth density, creation of new residential areas and deforestation activities. change detection is one of the main methods of management and evaluation of natural resources. we investigated forest changes in southern surroundin...