نتایج جستجو برای: aerial photograph
تعداد نتایج: 43459 فیلتر نتایج به سال:
Birds of conservation concern breed in suburban greenways, yet abundant populations of mammals that depredate bird nests might reduce nest success. We evaluated how three factors influenced the abundance of mammalian nest predators in thirty-four 300-m long forested greenway segments in Raleigh and Cary, North Carolina, USA: (1) the width of the forested corridor containing the greenway, (2) th...
This work is intended as a work of reference for those engaged in research work on mental diseases and so does not lend itself to an abstract. To be appreciated it must be read in the original. The book is beautifully got up. All the illustrations are from original specimens. The reproductions are from untouched photographs. There are four sketches in colour by well-known medical artists and ea...
Describing urban terrain and land use/land cover (LULC) characteristics accurately is an essential element in environmental modeling, assessment and management. Urban terrain and LULC information are especially important in meteorological modeling applications, such as simulations of atmospheric flow over cities, defining surface energy budgets, and fate and transport studies of urban contamina...
Black and white and true-colour aerial photography from 2004, 1993 and 1985 are used for studies of growth and change of informal settlements in Voi, SE-Kenya. The digital data is orthorectified, corrected for brightness variations caused by light falloff and bidirectional effects and mosaicked using EnsoMOSAIC and Erdas Imagine software. The constructed mosaics are segmented with eCognition so...
In Finland, the forest inventory for the forest management planning has traditionally been based on visual inventory by stands. In this method, the forest stands that are delineated on aerial photographs on the basis of their growing stock and site-related characteristics are measured or estimated in the field. The method is considered too labour-intensive, and it requires a large amount of fie...
Royal mangrove wetland, Jamaica.” Journal of Coastal Research 14(3): 951-959. Studies on the historical development of mangrove wetlands are rare in contrast to the vast array of information on the geological development of these systems. Historical development of the Port Royal mangal was investigated so as improve understanding of recent changes occurring in relation to the increasing threat ...
Photographs are records of projected images of the photographed scene. All the parameters of the projection are defined by the lens and the image sensor used. To efficiently merge multiple photographs, the projection parameters must be adjusted and the lens distortion has to be computed and eliminated. This paper describes a method for merging of multiple photographs and for elimination of the ...
Building model reconstruction has been attracting a great attention from researchers in the geomatics society all over the world. Buildings provide essential information to urban planning, tourism, telecommunication, homeland security, and many others. Much building reconstruction research has been conducted on aerial photographs and LIDAR point data. Some studies are commenced by researchers i...
To estimate positions of individual spruce tree tops in highhresolution aerial photographs, templates derived from an optical tree crown model and from the geometry at image acquisition are used. This approach makes it possible to nd and position tree tops from a wide range of viewing angles. The optical model includes single reeection from two types of scatterers: needless and branchess. The s...
At 14:28 (Beijing time) on 12 May 2008, the catastrophic Ms 8.0 Wenchuan earthquake occurred just west of the Sichuan basin, China, causing severe damage and numerous casualties. It also triggered a large number of landslides, rock avalanches, debris flows etc. Some of the landslides formed natural dams in the rivers, with the potential secondary hazard of subsequent flooding. Through the inter...
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