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...

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...

gully erosion is one of the most severe types of water erosion that inclusive and global model to represent its development under different environmental circumstances is difficult. moreover, having knowledge about history behaviors of a gully and its advancement requires direct annual monitoring that is not possible in iran conditions because of cost and time. gis and remote sensing with provi...

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...

green space is counted as one of the important bases of each city, especially great cities like tehran. with considering to vast application of urban green aria, the necessity of the managing these sources is felt more day-by-day. for proper managing each source, first the inventory of that source is taken into the consideration. regretfully so far there has been no comprehensive studios patter...

This article deals with the integration of multi-sources information in the context of geographical database updating. We manage aerial photos to obtain information that will be compared with those stored into the database. We also explain why and how this process of updating could help us to index the aerial photo. We propose a common methodology based on Delaunay Triangulation to structure da...