The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Regional evapotranspiration (ET) is an important component in water cycle and energy balance. The research on regional evapotranspiration is very important to further our understanding of the global climate change, land surface atmosphere interaction, water cycle and ecological study. However, traditional site observation is only representative of the local site scale, which can not reflect the real...
The measurement of spatially distributed water surface elevation (WSE) at the global scale, which is planned by “Surface Water and Ocean Topography (SWOT) mission”, will bring lots of fresh knowledge on global-scale terrestrial water circulation especially when observed WSE is merged into global hydrodynamics modes by data assimilation. In this paper, we discussed the predictability of WSE by a global...
The objective of this study is to produce an automated micro-landform map of an alluvial plain by combining land surface parameters (LSPs) from Shuttle Radar Topographic Mission Digital Elevation Model (SRTM DEM) and land cover characteristics from satellite images (Landsat and ASTER) for further flood hazard assessment. Local relief and average elevation from SRTM DEM are designated as LSPs. In addition,...
In this paper, the potential of using passive microwave observations to detect and monitor flood was explored during the time period 2005–2009. Data from the Advanced Microwave Scanning Radiometer (AMSR-E) was used to evaluate the performance of radiometry in flood monitoring and detection. The current study demonstrates the potential of these observations to monitor the floods in the Sundarban Delta...
Land use and landscape pattern changes were analyzed in Nanjing during 1988-2007, based on RS, GIS and Fragstats software. This city was divided into six regions to explore the detailed variations of land use and landscape pattern in the regions. Landscape pattern were investigated at both landscape level and at class level, by way of various landscape metrics. The results revealed that urban area...
Despite growing recognition of the issue of grassland degradation, few regional estimates of linear object impacts on grassland degradation [1]. We presented a methodology for evaluating regional impacts on steppe degradation from linear objects which were two uppermost types, rivers and roads, in the typical steppe region of northern China. Spatial accessibility to water resources and roads were...
Based on the data of meteorological and hydrological collected from 1961 to 2004, the cause have been analyzed on the lowest runoff in the upper reaches of yellow River in recent years in this paper. The results indicate runoff recorded exhibited slight decrease trend from 1961 to 2004, but there is a notable decrease trend of runoff since 1990. It is noteworthy that low stream continued 15 years...
Management of wetlands resources often requires assessment of changes in wetland vegetation over time. Accurate tracking of the expansion or retraction of invasive plant species is especially critical for natural resource managers who must make decisions on the deployment of effective control measures. Many available remote sensing strategies to quantify the location of invasive plant species are...
An autonomous, unmanned, aerial, remote sensing platform called AggieAir™ has been developed at Utah State University (USU) to produce multispectral aerial imagery. Its independence of a runway, low cost, and rapid turn-around time for imagery make it an efficient platform for applications in riparian areas and in wetlands management. Using third-party software, the imagery from AggieAir can be stitched...
The multi-polarized and polarimetric capabilities of RADARSAT-2 are evaluated to enhance river and lake ice monitoring. Multi-year time series of polarimetric images for selected rivers and lakes in north-western Canada are analyzed for their information potential. Meteorological and geophysical field measurements support the interpretation of polarimetric imagery. Statistically estimated thresholds...
We applied C-band SAR data acquired by RADARSAT-2 to examine ground surface changes in the active volcanic field. In the active volcano area, the observation of secondary disaster with rainfall is also important as well as direct influence by the volcanic eruption. By continuous monitoring, we generated a change detection image from the Spotlight mode data (1m resolution). By using the change detection...
Being source of Inland River in arid areas, the mountain landscape pattern influence the hydrological process, and play an important role in ecological balance. It is essential for us to understand landscape pattern dynamic changes and the driving forces to estimate the characteristics of development the landscape pattern and water resource. However, knowledge of the grassland degradation in vertical...
The source region of the Datong River is an inland watershed and located at the northeastern edge of the Qinghai-Tibetan Plateau. There is relatively plentiful rainfall in the source region. Vegetation, mainly composed of alpine meadow and alpine swamp meadow, developed well and covered mostly the ground surface of the source region. The equivalent-elevation approach has been proved a valid method...
Land use/land cover change (LUCC) as an important part of global environmental change has always been one of the hottest issues of ecology research. Based on RS and GIS methods, land use information for 1990 and 2008 was acquired from TM images and analyzed in Yanqing County, Beijing, China. This paper analyzes spatial-temporal land use change in two basins covering the study period. The results showed...
Additionally to the main product of the TanDEM-X mission - the global Digital Elevation Model (DEM) - a global water body mask will be produced. The main goal of this water mask is to deliver an information layer to support a subsequent DEM editing process. It is derived from the SAR amplitude and the single pass coherence. In this paper, the concept of the global water body detection is explained...
The future spatial SWOT mission will use a new altimetric sensor “KaRIn”, which is a Ka-band interferometric SAR system operating on near-nadir swaths on both sides of the satellite track [1]. The objective is to study the height of the earth's water surfaces, mainly oceans, but also continental water surfaces such as lakes and rivers. This article dedicated to water surface detection methods, presents...
Coastal shoreline movement due to erosion and deposition is a major concern for coastal zone management. Shoreline changes by natural cause or development constructions. Shoreline change is threatening and destroying living things in the marine environment. Topography of coastal area changes frequently due to a drastic sediment movement. In this study, we monitor the shoreline change and movement...
The Kokoda Track area of Papua New Guinea is geographically diverse, with terrain varying from coastal areas to steep mountains, and biomes that extend from mangroves, to grasslands and savannas, and primary forests. The area is the subject of conservation measures using remotely sensed data in a collaboration between the Australian and Papua New Guinea governments. We describe this Kokoda Track initiative...
Using ASTER data, we determined the each specificity of paddy field in the world. Shonai Plain is typical paddy field area in Japan, and has well-developed irrigation and drainage systems. Yangtze River Delta in Middle-East China is the famous paddy fields area in the world, and fishponds are increased recently. Northeast Thai Plain in Thailand and Mekong Delta in Vietnam are famous to produce exporting...
The atmospheric downward longwave radiation (DLR) is a key variable of land surface energy budget. In this study, the clear-sky DLR at high spatial resolution in Heihe River Basin was estimated from MODIS data, and three algorithms containing empirical and hybrid methods were compared. Compared with field measurement, the Idso scheme and Tang's scheme had relatively better performance than Wang's...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.