Satellite data Articles
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Assimilation of satellite data to 3D hydrodynamic model of Lake Säkylän Pyhäjärvi
To analyze the applicability of direct insertion of total suspended matter (TSM) concentration field based on turbidity derived from satellite data to numerical simulation, dispersion studies of suspended matter in Lake Säkylän Pyhäjärvi (lake area 154 km2; mean depth 5.4 m) were conducted using the 3D COHERENS simulation model. To evaluate the practicality of direct ...
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Near real–time monitoring of the April–May 2010 Eyjafjallajökull ash cloud: an example of a web–based, satellite data–driven, reporting system
During the 2010 eruption of Eyjafjallajökull volcano (Iceland) we set up a system designed to ingest satellite data and output volcanic ash cloud products. The system (HVOS = HotVolc Observing System) ingested on–reception data provided every 15 minutes by the SEVIRI sensor flown aboard the Meteosat Second Generation (MSG) satellite. Data were automatically processed and posted on the ...
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The Great Flood of 2019: A Complete Picture of a Slow-Motion Disaster
This year's flooding across the Midwest and the South affected nearly 14 million people, yet the full scale of the slowly unfolding disaster has been difficult to fathom. To visualize just how extensive it was, The New York Times created this composite map showing all the areas that were inundated at some point from January through June. The blue on the map, generated from satellite data used to ...
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Improving drought risk modelling: using multiple periods of satellite data with ensembles of data mining algorithms
This paper describes improvements to the Vegetation Outlook (VegOut) model developed by the National Drought Mitigation Center for the USA. VegOut provides early drought warning by predicting general vegetation conditions at multiple time steps (e.g., 2–, 4– and 6–week outlooks). VegOut integrates climate, biophysical, oceanic, and satellite–based vegetation data with data mining algorithms to ...
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DNI satellite data truth? - How to handle the difference in values derived from different satellite data providers?
Technical Top Tip courtesy of Solar Resource Assessment - When it comes to CSP project evaluation, one of the biggest uncertainty factors for the performance is the available Direct Normal Irradiance (DNI) at the site. 1. DNI vs. GHI DNI distinguishes significantly from GHI (Global Horizontal Irradiance), which is more applicable for Photovoltaic projects. GHI includes direct and diffuse ...
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A GIS-based assessment of the Byzantine water supply system of Constantinople
Despite the extensive archaeological surveys carried out in the last decades, little attention has been paid to one of the longest water supply systems of ancient times – the Byzantine water infrastructure which fed Constantinople from the mid-late fourth century ad. This work uses modern satellite terrain data and Global Positioning System (GPS) data to assess this system and provide an ...
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Application of dynamic threshold in sea and lake ice mapping and monitoring
Ice detection and monitoring algorithms using visible and infrared images are generally founded on thresholds-based approaches. Classification of features over ice covered sea requires a series of reliable thresholds. The change in surface conditions throughout the season affects these thresholds and makes their adjustment necessary. This study proposes an operational method based on a set of ...
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Satellite-based estimation of atmospheric stability parameters in urban and remote areas
A methodology is presented which can be used to determine atmospheric stability parameters in urban and remote areas where ground-based meteorological observations are not routinely available. The method resolves the surface energy balance by means of satellite remote sensing in an original way. Ground-based data from the FIFE experiment are used to validate parts of the methodology. Results are ...
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A scalable open-source web-analytic framework to improve satellite-based operational water management in developing countries
Two software development hurdles to advancing real-world operationalization of satellite datasets for water management are addressed in this study. First, a simple, easy-to-build and open-source web portal connecting to a back-end complex model is developed for resource-constrained developing nations. Second, to enhance the skill of satellite-based predictions, an innovative and dynamic web ...
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Meteorological simulations with use of satellite data for assessing urban heat island under summertime anticyclonic conditions
The aim of this study was to investigate the formation, evolution and evaluation of topography effects on the urban heat island over the city of Zagreb. For this purpose, the non-hydrostatic mesoscale meteorological model MEMO was used and high-resolution simulations were carried out for two summertime anticyclonic periods. Satellite data were used to improve the model's performance. The ...
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Geo-information services for Ugandan smallholder farmers (MUIIS) - Case Study
The MUIIS project harnesses the power of satellite data to support extension and advisory services to farmers in Uganda. The project has a strong focus on capacity building of farmers organizations and serves the need for timely, accurate and actionable information regarding crop management and climate risks. EARS is a data partner and is helping to develop the insurance component of the service ...
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How Drones Combined With Satellite Data Provide Cost Saving Inputs
INTRODUCTION Agrodrone is an Israel based company with a great experience of UAVs (Unmanned Aerial Vehicles commonly known as Drones). The company is currently associated with the application of UAVs in the field of agriculture to help farmers with the help of satellite images and airborne equipment. They have also been certified operational by CAAI (Civil Aviation Authority of Israel). ...
By Farmonaut
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Time-series change detection approach for flood modelling
A remote sensing approach for flood mitigation is presented. Landsat TM satellite imagery and digital topographic sheets were the main datasets for mapping a section of the Qu'Appelle River, located in Southern Saskatchewan, Canada. Three time-series change detection images for periods between 1988-1992, 1992-2000 and 1988-2000 demonstrate that Landsat satellite data are efficient multi-temporal ...
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Identifying priority areas for reforestation using remote sensing and geographical information systems: a case study from Turkey
This study uses Landsat 7 ETM and IKONOS satellite data to estimate the priority areas for reforestation in a forest management planning unit of Turkey. Three important parameters, crown closure, slope and soil moisture, were used to identify potential reforestation areas. The existing crown closure classes were obtained from the forest stand type map of the study area. Slope map of the study ...
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Satellite Images Show Threat of Florida’s Toxic Algal Bloom
Florida’s Lake Okeechobee algal blooms are even higher this summer causing many significant problems for local residents Florida’s Lake Okeechobee is experiencing a massive algal bloom that threatens waterways throughout the entire state. This enormous algal bloom in Florida’s largest freshwater lake could cause many grave issues within the local ecosystem, and far beyond it. A ...
By LG Sonic
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Evapotranspiration estimate from water balance closure using satellite data for the Upper Yangtze River basin
Application of hydrological models for water resources management at large continental river basins is often limited by the scarcity of in situ meteorological forcing data. Remote sensing information provides an alternative to in situ data, with observations that are, in some cases, at higher spatial and temporal resolutions than those available from traditional ground sources. In this work, ...
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Air temperature retrieval from remote sensing data based on thermodynamics
A new approach to retrieving air temperature from land surface temperature is presented. The new method is based on thermodynamics. Two important parameters, namely crop water stress index and aerodynamic resistance, were used to build a quantitative relationship between the land surface temperature and the ambient air temperature. The method was applied using MODIS satellite data for a location ...
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Temporal behaviour of Asian dust aerosols observed in 2001 using meteorological satellite data
The advection and dispersion of Asian dust events from China and Mongolia to the Pacific Ocean around Japan in the spring of 2001 were investigated using meteorological satellite data, NOAA/AVHRR and GMS-5/VISSR. Aerosol Vapour Index (AVI) images, taking the brightness temperature difference between 11 and 12 _m, are very effective in monitoring the Asian dust phenomenon in the east Asian region, ...
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A satellite perspective on jökulhlaups in Greenland
Methods by remote sensing techniques were developed to locate potential jökulhlaup lakes and to assess the volume of water discharged. To locate potential jökulhlaup lakes, a time sequence of LandSat satellite imagery covering the area was investigated with spectral mapping techniques. The investigations showed how LandSat images can be used to map surface water, glacial ice, and ...
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Remote sensing and GIS based assessment of soil erosion and soil loss risk around hill top surface mines situated in Saranda Forest, Jharkhand
The quantitative analysis of soil erosion changes over 7 years due to mining operations in two neighboring hilltops in West-Singhbhum District, Jharkhand, are reported. CartoSat-1, ETM+ and LISS-IV satellites' data provided spatial inputs in Universal Soil Loss Equation (USLE) and Morgan, Morgan and Finney method (MMF) models, which were used to predict the average annual soil erosion during ...
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