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Journal articles on the topic 'Satellite spots'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Hanley, Kipp. "Satellite Technology Spots Distribution System Leaks." Opflow 46, no. 4 (2020): 24–25. http://dx.doi.org/10.1002/opfl.1353.

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Pilyugin, L. S., B. Cedrés, I. A. Zinchenko, et al. "MaNGA galaxies with off-centered spots of enhanced gas velocity dispersion." Astronomy & Astrophysics 653 (September 2021): A11. http://dx.doi.org/10.1051/0004-6361/202141012.

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Off-centered spots of the enhanced gas velocity dispersion, σ, are revealed in some galaxies from the Mapping Nearby Galaxies at Apache Point Observatory survey (MaNGA). Aiming to clarify the origin of the spots of enhanced σ, we examine the distributions of the surface brightness, the line-of-sight velocity, the oxygen abundance, the gas velocity dispersion, and the Baldwin-Phillips-Terlevich spaxel classification in seven galaxies. We find that the enhanced σ spots in six galaxies can be attributed to a (minor) interaction with a satellite. Three galaxies in our sample have a very close sate

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Zhang, Jia Hua, and Feng Mei Yao. "Advance in Monitoring Forest Fire in China Based on Multi-Satellite Data." Advanced Materials Research 518-523 (May 2012): 5668–72. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.5668.

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The advance in monitoring forest fire in China based on multi-Satellite data were discussed in the paper. Since the 1980s in China, the satellite remotely-sensed data have been acquired, such as NOAA/AVHRR, FY-series, MODIS, CBERS, and ENVISAT, have been widely utilized for monitoring forest fire hot spots and burned areas in China. Some developed algorithms have been utilized for detecting the forest fire hot spots.

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Zhang, Hongbo, Ke Wang, and Xiaoyu Shang. "High time effective detection strategy for geosynchronous orbital space debris." Journal of Physics: Conference Series 2764, no. 1 (2024): 012087. http://dx.doi.org/10.1088/1742-6596/2764/1/012087.

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Abstract After the formation of a multi-satellite network in a hypersynchronous orbit, it has the ability to continuously and in real-time observe the GEO band, which is an ideal way to solve blind spots and semi-backlight observations and improve the system’s high time-effective coverage ability. In response to the application limitations of high-orbit real-time monitoring constellations in hypersynchronous orbits, such as the large number of satellites in the network, high requirements for satellite detection capability, large field of view, and high launch and orbit cost, this paper propose

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Goguen, J. D., W. M. Sinton, D. L. Matson, et al. "Io hot spots: Infrared photometry of satellite occultations." Icarus 76, no. 3 (1988): 465–84. http://dx.doi.org/10.1016/0019-1035(88)90015-2.

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Stokel-Walker, Chris. "AI spots possible archaeological sites in satellite images." New Scientist 257, no. 3427 (2023): 9. http://dx.doi.org/10.1016/s0262-4079(23)00323-8.

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Mupfiga, Upenyu Naume, Onisimo Mutanga, Timothy Dube, and Pedzisai Kowe. "Spatial Clustering of Vegetation Fire Intensity Using MODIS Satellite Data." Atmosphere 13, no. 12 (2022): 1972. http://dx.doi.org/10.3390/atmos13121972.

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This work analyses the spatial clustering of fire intensity in Zimbabwe, using remotely sensed Moderate Resolution Imaging Spectroradiometer (MODIS) active fire occurrence data. In order to investigate the spatial pattern of fire intensity, MODIS-derived fire radiative power (FRP) was utilized. A local indicator of spatial autocorrelation method, the Getis-Ord (Gi*) spatial statistic, was applied to show the spatial distribution of high and low fire intensity clusters. Analysis of the relationship between topographic variables, vegetation type, agroecological zones and fire intensity was done.

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Wang, N., and R. Yang. "THE APPLICATION OF CHINESE HIGH-SPATIAL-RESOLUTION REMOTE SENSING SATELLITE IMAGE IN LAND LAW ENFORCEMENT INFORMATION EXTRACTION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (April 30, 2018): 1751–55. http://dx.doi.org/10.5194/isprs-archives-xlii-3-1751-2018.

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Chinese high -resolution (HR) remote sensing satellites have made huge leap in the past decade. Commercial satellite datasets, such as GF-1, GF-2 and ZY-3 images, the panchromatic images (PAN) resolution of them are 2&amp;thinsp;m, 1&amp;thinsp;m and 2.1&amp;thinsp;m and the multispectral images (MS) resolution are 8&amp;thinsp;m, 4&amp;thinsp;m, 5.8&amp;thinsp;m respectively have been emerged in recent years. Chinese HR satellite imagery has been free downloaded for public welfare purposes using. Local government began to employ more professional technician to improve

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Shiohara, Amane;, Sergey; Novikov, Diego M.; Solís, José M.; Taboada, Fernando; Obelleiro, and Luis M. Liz-Marzán. "Plasmon modes and hot spots in gold nanostar-satellite clusters." Journal of Physical Chemistry C 119, no. 20 (2015): 10836–43. https://doi.org/10.1021/jp509953f.

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Gold nanostars display strong electromagnetic field enhancement at their tips, and tip plasmon resonances can be tuned within the visible and near-infrared, which has been applied toward plasmonic molecular sensing. However, the sensitivity can be further increased by linking gold nanostars to other plasmonic nanoparticles and thereby inducing the creation of hot spots. We report the controlled formation of core–satellite assemblies comprising a central gold nanostar with gold spheres adsorbed to the tips via Raman active molecular linkers. Surface-enhanced Raman scattering (SERS) was recorded

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Palkin, M. V. "Satellite Formation Flying Control Using Image Processing." Mekhatronika, Avtomatizatsiya, Upravlenie 20, no. 1 (2019): 52–58. http://dx.doi.org/10.17587/mau.20.52-58.

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A problem of a formation flying control is observed. As an example a concept of a multysatellite configuration ("space commercial") is described. Space advertisement is realized by groups of specialized free flying and cable-connected satellites, and their combinations. Construction of a space commercial satellite and a set of a control system equipment is presented. Several methods for group configuration are presented: periodic impulse correction of each flying satellite position formation; method of a satellite positioning on nocoplanar orbits. Other methods include combinations of methods

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Nikitin, A. A., I. L. Tsypysheva, Yu I. Zuenko, and Yu I. Zuenko. "Structure of the Primorye Current (Japan Sea) on satellite ima- ges and standard sections." Izvestiya TINRO 204, no. 4 (2024): 843–65. https://doi.org/10.26428/1606-9919-2024-204-843-865.

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Based on satellite images and standard sections obtained in 2000–2024, spatial structure of the Primorye Current as a band of cold waters along the coast of Primorye is considered. The archive of sea surface temperature reconstructed from the measurements of AVHRR radiometer (NOAA satellites) and MODIS spectroradiometer (AQUA, TERRA satellites) is used. The data were received and processed at the Center for collective use of regional satellite monitoring on environments in the Far-Eastern branch of Russian Ac. Sci. The main features of the Primorye Current structure are determined that allows

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Grankov, A. G., E. P. Novichikhin, and N. K. Shelobanova. "On the Problems of Monitoring Atmospheric Humidity Fields Using Satellite Microwave Radiometry Methods When Studying Cyclogenesis in the Tropical Atlantic." Радиотехника и электроника 68, no. 11 (2023): 1072–78. http://dx.doi.org/10.31857/s0033849423110049.

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Some problems of microwave radiometric methods for monitoring fields of total atmospheric moisture content from satellites in areas of hurricane formation in the tropical regions of the Atlantic are considered. The possibilities of using polar-orbiting satellites (DMSP, EOS Aqua, GCOM-W1) for these tasks are analyzed a feature of which is the presence of gaps in satellite data (blind spots) resulting from divergence of scanning bands at lower latitudes. It is shown through a number of examples that the joint use of various satellites makes it possible to reduce the influence of this effect and

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Shiohara, Amane, Sergey M. Novikov, Diego M. Solís, José M. Taboada, Fernando Obelleiro, and Luis M. Liz-Marzán. "Plasmon Modes and Hot Spots in Gold Nanostar–Satellite Clusters." Journal of Physical Chemistry C 119, no. 20 (2014): 10836–43. http://dx.doi.org/10.1021/jp509953f.

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Bonfond, B., D. Grodent, S. V. Badman, J. Saur, J. C. Gérard, and A. Radioti. "Similarity of the Jovian satellite footprints: Spots multiplicity and dynamics." Icarus 292 (August 2017): 208–17. http://dx.doi.org/10.1016/j.icarus.2017.01.009.

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Stopic, Renato, Eduardo Dias, Maurice de Kleijn, and Eric Koomen. "Satellite parking: a new method for measuring parking occupancy." AGILE: GIScience Series 4 (June 6, 2023): 1–5. http://dx.doi.org/10.5194/agile-giss-4-44-2023.

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Abstract. Parking management plays a critical role in keeping urban spaces accessible and urban managers strive for an optimal balance between not enough and too much parking. Deciding which parking space can be liberated or needs to be extended requires detailed data on parking occupancy trends. In person inspection and in-situ sensors can provide such data but are too costly for city wide deployment. High-resolution satellite imagery is becoming more affordable, has the advantage of instantaneously collecting information from the whole city, is continuously being updated, and available for s

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Nazari, Rouzbeh, Husam Alfergani, Francis Haas, et al. "Application of Satellite Remote Sensing in Monitoring Elevated Internal Temperatures of Landfills." Applied Sciences 10, no. 19 (2020): 6801. http://dx.doi.org/10.3390/app10196801.

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Subsurface fires and smoldering events at landfills can present serious health hazards and threats to the environment. These fires are much more costly and difficult to extinguish than open fires at the landfill surface. The initiation of a subsurface fire may go unnoticed for a long period of time and undetected fires may spread over a large area. Unfortunately, not all landfill operators keep or publish heat elevation data and many landfills are not equipped with a landfill gas extraction system to control subsurface temperatures generated from the chemical reactions within. The timely and c

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Zhao, Chun Lei, and Xia Hou. "Design & Application of Forest Fire Monitoring System by Remote Sensing for Beijing, Tianjin & Hebei." Advanced Materials Research 760-762 (September 2013): 1043–47. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.1043.

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In order to monitor the forest fire effectively and to reduce the loss caused by forest fire in North China areas, a forest fire monitoring system was designed. Based on satellite remote sensing data, GIS data and meteorological information, the system has functions such as processing of data, adjusting of forest fire index for judging hot spots, intelligent judging of hot spots, and analyzing of geographical information and weather condition of hot spots. Also fire information is issued on web and by short message service. The system makes the remote sensing monitoring of forest fire automati

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Li, Qi, Wei Xu, Zhi Hai Xu, and Hua Jun Feng. "Accuracy Analysis of Centroid Detection Method Used to Star Sensor." Advanced Materials Research 468-471 (February 2012): 401–4. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.401.

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Star sensor is important equipment for measuring satellite attitude and motion, and star centroid detection accuracy is the basis of the overall accuracy of star sensor. In star sensors, slightly- defocus method is often adopted to acquire dispersive light spots so as to facilitate centroid detection, and certain motion blur can also be introduced because of the motion of satellites. In this paper, we analyzed several commonly-used centroid detection algorithms by using simulation experiment to study the influence of defocus and motion parameters on the accuracy of centroid detection algorithm

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Wu, Lianghai, Zhanchuan Cai, Xiu He, Yuyun Chen, and Zhiguo Meng. "Comparative Analysis of Diurnal Thermal Radiation Variation among Lunar Craters of Different Ages Using CE-2 MRM Data." Remote Sensing 15, no. 15 (2023): 3857. http://dx.doi.org/10.3390/rs15153857.

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Microwave radiometer (MRM) is one of the important payloads on the Chang’e-2 (CE-2) Lunar satellite. In the Chang’e satellite’s observation of the microwave radiation brightness temperature (TB) on the lunar surface, there are some “cold spots” of microwave thermal radiation at night containing the Jackson crater. In order to compare the diurnal radiation TB differences of “cold spots” on the lunar surface, two typical craters at similar latitudes on the northern hemisphere on the lunar farside were selected: Jackson, which represents the new craters with a large number of discrete rocks on th

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Sukirman, Sukirman, Muhammad Ridwan, Muhammad Zainal, Rika Afriani, and Sri Hartati. "EFEKTIVITAS PEMANFAATAN SATELITE ASIASAT-9 UNTUK MENGATASI BLANK-SPOT (Studi Kasus pada TVRI Stasiun Sumatera Selatan)." Jurnal Ilmu Administrasi dan Studi Kebijakan (JIASK) 4, no. 2 (2022): 143–58. http://dx.doi.org/10.48093/jiask.v4i2.86.

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This study carefully examines the effectiveness of using the Asiasat-9 Satellite to overcome the Blank Spot in the South Sumatra Province. This study is intended to analyze and formulate how the effectiveness of the use of the Asiasat-9 Satellite to overcome the Blank Spot in the Province of South Sumatra. Research through a qualitative approach is carried out based on the problem to be studied with an explanation with the aim of exploring or building a proposition or explaining the meaning behind reality. Careful measurement of certain social phenomena is a characteristic of the descriptive l

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Sultana, Urmi, Mashrun Hoque, Popy Akter, et al. "Determination of Green Spots (Trees) For Google Satellite Images Using MATLAB." Procedia Computer Science 171 (2020): 1634–41. http://dx.doi.org/10.1016/j.procs.2020.04.175.

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Wu, X. J., and S. Horiuchi. "TEM study on the diffraction streaks caused by initial phase disorder in a displacive modulation structure." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 158–59. http://dx.doi.org/10.1017/s0424820100173923.

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Recently it was found in some electron diffraction patterns from one-dimensional displacive modulation structure that some streaks pass through the satellite spots. Fig.1 taken from a mineral Ankangite shows that the streaks always appear when the crystal was tilted along b*. This means than in this crystal there must be some reflection planes parallel to (a*, b*) plane in the reciprocal space. The similar EDPs are also observed in a crystal (Sr, Ca)3Cu5Ox. The streaks always pass through the satellite spots, which is quite different from the case where streaks are caused by conventional latti

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Jiang, Hu, Cheng Zhu, Lei Deng, et al. "ASO-S orbit evolution and its safety analyses." Journal of Physics: Conference Series 2898, no. 1 (2024): 012039. http://dx.doi.org/10.1088/1742-6596/2898/1/012039.

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Abstract Advanced space-based solar observatory (short for ASO-S) is one of the space projects sponsored by the Chinese Academy of Sciences; its main scientific goals are to monitor the solar activities during the solar maximal years and to aim at some discoveries of such solar activities as coronal mass ejection, solar flares, and sun spots. The main orbit element variations were simulated based on the online available data set of orbit elements for the satellite ASO-S. Furthermore, based on SOCRATES Plus software, the close approaching objects in space were simulated for satellite ASO-S. The

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Kumalawati, R., A. Yuliarti, J. T. Raharjo, et al. "Early Detection of Forest and Land Fires Using Hotspots Data from S-NPP VIIRS Satellite Imagery Recording in the New Capital City Location." IOP Conference Series: Earth and Environmental Science 1276, no. 1 (2023): 012031. http://dx.doi.org/10.1088/1755-1315/1276/1/012031.

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Abstract Forest and land fires are a natural disaster whose frequency is increasing annually, especially during dry season, forest and land fires also impact the new capital city in East Kalimantan as well. Early detection is very critical to prevent increasing impact of forest and land fires. Early detection can be done using hotspot data from satellite image recording. Based on this, it is very necessary to conduct research entitled Early Detection of Forest and Land Fires Using Hot Spots from “S-NPP VIIRS Image Records in the New Capital City Location”. The research was conducted in the new

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Abraham, L., and M. Sasikumar. "Vehicle Detection and Classification from High Resolution Satellite Images." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-1 (November 7, 2014): 1–8. http://dx.doi.org/10.5194/isprsannals-ii-1-1-2014.

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In the past decades satellite imagery has been used successfully for weather forecasting, geographical and geological applications. Low resolution satellite images are sufficient for these sorts of applications. But the technological developments in the field of satellite imaging provide high resolution sensors which expands its field of application. Thus the High Resolution Satellite Imagery (HRSI) proved to be a suitable alternative to aerial photogrammetric data to provide a new data source for object detection. Since the traffic rates in developing countries are enormously increasing, vehi

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Yang, Xiaomeng, Junfeng Xie, Ren Liu, Fan Mo, and Junze Zeng. "Centroid Extraction of Laser Spots Captured by Infrared Detectors Combining Laser Footprint Images and Detector Observation Data." Remote Sensing 15, no. 8 (2023): 2129. http://dx.doi.org/10.3390/rs15082129.

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On-orbit geometric calibration of satellite-borne laser based on infrared detectors is the key tool to ensure the elevation measurement accuracy, and the accuracy of on-orbit geometric calibration is directly determined by laser spots captured by detectors. Mathematical methods, such as gray-scale barycenter, are widely applied for centroid extraction of spots captured by infrared detectors and completely depend on the energy values at points measured by detectors, which have low precision and are greatly affected by the consistency of the detectors and other factors at present. Based on the a

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Válio, Adriana, and Eduardo Spagiari. "Starspots Magnetic field by transit mapping." Proceedings of the International Astronomical Union 9, S302 (2013): 220–21. http://dx.doi.org/10.1017/s1743921314002129.

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AbstractSunspots are important signatures of the global solar magnetic field cycle. It is believed that other stars also present these same phenomena. However, today it is not possible to observe directly star spots due to their very small sizes. The method applied here studies star spots by detecting small variations in the stellar light curve during a planetary transit. When the planet passes in front of its host star, there is a chance of it occulting, at least partially, a spot. This allows the determination of the spots physical characteristics, such as size, temperature, and location on

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Moquin, Julie, Jordan Ealy, Joshua E. Schlieder, and Christopher Johns-Krull. "Localizing Stellar Activity on Low-mass Stars with the Transiting Exoplanet Survey Satellite." Research Notes of the AAS 8, no. 5 (2024): 138. http://dx.doi.org/10.3847/2515-5172/ad4da0.

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Abstract Magnetic reconnection is the underlying cause of stellar flares which are linked to regions of high magnetic activity, like star spots. To understand trends in stellar activity, we need to study how it is heightened by rapid rotation and deep convection in young low-mass stars. We analyze light curves of such stars observed by the Transiting Exoplanet Survey Satellite to investigate trends in flare timing with starspot modulation signals. Trends in flare properties and spot modulation can provide a means to “localize” which face of a star flares more frequently and better understand t

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Ginzburg, A. I., E. V. Krek, A. G. Kostianoy, and D. M. Soloviev. "ON THE ROLE OF MESOSCALE VORTICES IN THE OIL SPILL TRANSPORT IN THE SOUTH-EASTERN BALTIC SEA (SATELLITE INFORMATION)." DEDICATED TO THE 90TH ANNIVERSARY OF PROF. K.N. FEDOROV OCEAN PHYSICS 47, no. 3 (2019): 8–19. http://dx.doi.org/10.29006/1564-2291.jor-2019.47(3).2.

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In this paper, on the basis of an analysis of the successive satellite optical images (MODISAqua, TIRS Landsat-8, AVHRR NOAA-18) and radar images (SAR-C Sentinel-1A, SAR-C Radarsat-2) on June 8–11, 2015, the effect of the mesoscale vortex movement (anticyclone with diameter of 35 km and associated cyclone) on the transport of oil spots in the northern part of the Gdansk Bay was demonstrated for the first time. The velocities of this transport are estimated; the observed picture of the movement of the spots is compared with their transfer according to the Seatrack Web model. The largest (about

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Slysh, Vyacheslav I., Maxim A. Voronkov, Irina E. Val'tts, et al. "Space-VLBI observations of OH masers." Symposium - International Astronomical Union 206 (2002): 105–11. http://dx.doi.org/10.1017/s0074180900222171.

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We report on the first space-VLBI observations of the OH masers in two main-line OH transitions at 1665 and 1667 MHz. The observations involved the space radio telescope on board the Japanese satellite HALCA and an array of ground radio telescopes. The maps of the maser region and images of individual maser spots were produced with an angular resolution of 1 mas, which is several times higher than the angular resolution available on the ground. The maser spots were only partly resolved and a lower limit to the brightness temperature 6 × 1012 K was obtained. The masers seem to be located in the

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Nguyen, Ngoc Tuyen, Nhu Ngoc Nguyen, and Chi Cuong Pham. "Identifying impervious surface hot spots in Ho Chi Minh City using object-based classification and spatial statistics." IOP Conference Series: Earth and Environmental Science 1349, no. 1 (2024): 012030. http://dx.doi.org/10.1088/1755-1315/1349/1/012030.

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Abstract Impervious surface is often a primary indicator for urbanization. The rapid expansion of impervious surface area (ISA) can lead to a variety of environmental issues such as the change in local climate, urban heat islands, urban flooding, biodiversity loss, and the depletion of air quality. In this paper, satellite data from Landsat 5 TM, Landsat 8 OLI, and Sentinel-2 were employed to extract impervious areas in Ho Chi Minh City (HCMC) from 2009 to 2022 by integrating the object-based image analysis and Kernel density estimation method. Regarding spatial analysis, optimized hot spot an

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Hufford, Gary L., Herbert L. Kelley, Raymond K. Moore, and Jeffrey S. Cotterman. "Detection and growth of an Alaskan forest fire using GOES-9 3.9 µm imagery." International Journal of Wildland Fire 9, no. 2 (1999): 129. http://dx.doi.org/10.1071/wf00017.

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The utility of the new GOES-9 satellite 3.9 µm channel to monitor wildfires and their subsequent changes in growth and intensity in Alaska is examined. The June, 1996 Miller’s Reach forest fire is presented as a case study. Eighteen hours of sequential imagery coincident to the initiation and early stages of the fire are analyzed for hot spots. The dramatic response of the 3.9 µm channel to sub-pixel hot spots and the ability to access the data every 15 minutes makes the channel an effective tool to support forest fire management on wildfires in high latitudes to at least 61°N. In the case of

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Belova, Yulia, Irina Razveeva, and Elena Rakhimbaeva. "Intelligent analysis of Earth remote sensing data on the distribution of phytoplankton and pollutants in coastal systems." E3S Web of Conferences 363 (2022): 02026. http://dx.doi.org/10.1051/e3sconf/202236302026.

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Currently, one of the topical areas of application of artificial intelligence methods in ensuring environmental monitoring of water resources is the analysis of Earth remote sensing images in order to control and prevent potentially dangerous changes in the environment. In the future, algorithms with elements of artificial intelligence form the basis of forecasting and decision-making systems. Systems for ensuring high-quality environmental monitoring can be improved using artificial intelligence methods, in particular, the development and application of special algorithms to prevent emergenci

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Gürsoy, Ö., A. C. Birdal, F. Özyonar, and E. Kasaka. "Determining and Monitoring the Water Quality of Kizilirmak River of Turkey: First Results." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-7/W3 (April 30, 2015): 1469–74. http://dx.doi.org/10.5194/isprsarchives-xl-7-w3-1469-2015.

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Water resources are getting more and more important with each passing day in case of survival of humanity. For this reason, assessing water resources’ quality and also monitoring them have attracted lots of attention in the recent years. Remote sensing has been growing widely in the last decade and its resources are very usable when it comes to water resources management. In this study, by using remote sensing technology, satellite images that have 350 to 1050 nanometres wavelength band sensors (e.g. CHRIS Proba) are used to determine the quality of the Kizilirmak River’s water. Kizilirmak Riv

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Ren, Chaofeng, Junfeng Xie, Xiaodong Zhi, Yun Yang, and Shuai Yang. "Laser Spot Center Location Method for Chinese Spaceborne GF-7 Footprint Camera." Sensors 20, no. 8 (2020): 2319. http://dx.doi.org/10.3390/s20082319.

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The Gaofen-7 (GF-7) satellite is equipped with two area array sensor footprint cameras to capture the laser altimeter spot. In order to establish a direct correspondence between the laser data and the stereo image data, a new method is proposed to fit the center of the spot using the brightness difference between the spot image and the footprint image. First, the geometric registration between the spot image and the footprint image is completed based on feature matching or template matching. Then, the brightness values between the two images are extracted from the corresponding image position

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Pacheco, Carlos Eduardo, María Inmaculada Aguado, and Danilo Mollicone. "Identification and characterization of deforestation hot spots in Venezuela using MODIS satellite images." Acta Amazonica 44, no. 2 (2014): 185–96. http://dx.doi.org/10.1590/s0044-59672014000200004.

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Land cover changes over time as a result of human activity. Nowadays deforestation may be considered one of the main environmental problems. The objective of this study was to identify and characterize changes to forest cover in Venezuela between 2005-2010. Two maps of deforestation hot spots were generated on the basis of MODIS data, one using digital techniques and the other by means of direct visual interpretation by experts. These maps were validated against Landsat ETM+ images. The accuracy of the map obtained digitally was estimated by means of a confusion matrix. The overall accuracy of

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Steffke, Andrea M., and Andrew J. L. Harris. "A review of algorithms for detecting volcanic hot spots in satellite infrared data." Bulletin of Volcanology 73, no. 9 (2011): 1109–37. http://dx.doi.org/10.1007/s00445-011-0487-7.

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Davies, Ashley Gerard, and Sylvain Douté. "Galileo NIMS Observations of Io." Highlights of Astronomy 12 (2002): 614–17. http://dx.doi.org/10.1017/s1539299600014398.

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AbstractThe Near Infrared Mapping Spectometer (NIMS) on the Galileo spacecraft has been observing the volcanic Jovian satellite Io at regular intervals since June 1996. These infrared observations have allowed detailed mapping of the distribution and grain size of sulfur dioxide on Io’s surface, identification of volcanic centers, mapping of the distribution of hot spots, and investigations into the style and evolution of individual volcanic eruptions.

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Bird, David, and John Barnard. "Magnetic Scattering in High-Energy Electron Diffraction." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (1990): 534–35. http://dx.doi.org/10.1017/s0424820100136271.

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Over the past 25 years or so, neutron diffraction has become the standard method of probing the internal magnetic structure of crystals. More recently, however, it has been found that x-ray magnetic scattering, although weak, can be observed using bright x-ray sources. The success of x-ray techniques leads one to wonder whether magnetic scattering might also be observed using electrons, and it is this question that is addressed here. Clearly, electrons are influenced by the internal magnetic fields of specimens_this is the basis of Lorentz microscopy of ferromagnetic domains. Here we examine s

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Molchanov, O., A. Rozhnoi, M. Solovieva, et al. "Global diagnostics of the ionospheric perturbations related to the seismic activity using the VLF radio signals collected on the DEMETER satellite." Natural Hazards and Earth System Sciences 6, no. 5 (2006): 745–53. http://dx.doi.org/10.5194/nhess-6-745-2006.

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Abstract. The analysis of the VLF signals radiated by ground transmitters and received on board of the French DEMETER satellite, reveals a drop of the signals (scattering spot) connected with the occurrence of large earthquakes. The extension of the "scattering spots" zone is large enough (1000–5000 km) and, probably, it increases with the magnitude of the "relative" earthquake. A possible model to explain the phenomenology, based on the acoustic gravity waves and the ionosphere turbulence, is proposed. The method of diagnostics applied to this study has the advantage to be a global one due to

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Krestenitis, Marios, Georgios Orfanidis, Konstantinos Ioannidis, Konstantinos Avgerinakis, Stefanos Vrochidis, and Ioannis Kompatsiaris. "Oil Spill Identification from Satellite Images Using Deep Neural Networks." Remote Sensing 11, no. 15 (2019): 1762. http://dx.doi.org/10.3390/rs11151762.

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Oil spill is considered one of the main threats to marine and coastal environments. Efficient monitoring and early identification of oil slicks are vital for the corresponding authorities to react expediently, confine the environmental pollution and avoid further damage. Synthetic aperture radar (SAR) sensors are commonly used for this objective due to their capability for operating efficiently regardless of the weather and illumination conditions. Black spots probably related to oil spills can be clearly captured by SAR sensors, yet their discrimination from look-alikes poses a challenging ob

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Sinaga, Gerson, I. Made Yuliara, Ni Nyoman Rupiasih, I. Ketut Sukarasa, I. G. A. P. Adnyna, and I. G. A. Widagda. "Studi Pola Sebaran Asap Dan Kondisi Parameter Fisis Meteorologi Berbasis Citra Satelit Himawari-8 (Kasus: Kebakaran Hutan di Provinsi Jambi)." Kappa Journal 8, no. 1 (2024): 16–27. https://doi.org/10.29408/kpj.v8i1.23981.

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This research has conducted a study of smoke distribution patterns and conditions of meteorological physical parameters based on Himawari-8 satellite imagery (Case: Forest Fires in Jambi Province). Data analysis was carried out in this study using Himawari-8 satellite image data with processed RGB False Color method in SATAID software. Meteorological factors such as hot spots, rainfall, air temperature, wind direction and speed are parameters that can affect the process of forest fires and smoke distribution. The data collected in this research is secondary data. The meteorological data and sm

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Gilbert, Haiwa, Djibrilla Mana, Ondoua Joseph Marie, Tchobsala Tchobsala, and Ngakou Albert. "SPATIO-TEMPORAL ANALYSIS OF LAND USE TYPES FROM 1993 TO 2023 IN THE SOUDANO-SAHELIAN ZONE OF CAMEROON." International Journal of Advanced Research 12, no. 12 (2024): 487–502. https://doi.org/10.21474/ijar01/20047.

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This work raises the problem of the evolution of deforestation in the Sudano-Sahelian zone of Cameroon. This land cover study was mainly based on diachronic analyzes of satellite images (Landsat). Diachronic analysis, used for a long time to understand the transformations of space, is an approach which carries out a comparative study, by superposition, or even juxtaposition of the different documents processed. Diachronic analysis in this study is developed over a three-decade period. Understanding vegetation dynamics in this study region requires careful analysis of how vegetation has evolved

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Shakhvorostova, N. N., J. M. Moran, A. V. Alakoz, H. Imai, C. R. Gwinn, and A. M. Sobolev. "Fine structure and refractive scattering of the H₂O maser in star-forming region W49N." Proceedings of the International Astronomical Union 18, S380 (2022): 238–39. http://dx.doi.org/10.1017/s1743921323003460.

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AbstractWe used the unprecedented resolution of ∼25 μas of the VLBI array formed with the RadioAstron satellite to study the structures of H2O maser spots in the star forming region W49N. We found that anisotropic diffractive scattering of the ISM dominates the images of the maser spot, but does not completely blur them. The refractive scattering floor is about 0.001 in visibility at a baseline of 8 Gλ.

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Lacava, Teodosio, Matthieu Kervyn, Mariangela Liuzzi, Francesco Marchese, Nicola Pergola, and Valerio Tramutoli. "Assessing Performance of the RSTVOLC Multi-Temporal Algorithm in Detecting Subtle Hot Spots at Oldoinyo Lengai (Tanzania, Africa) for Comparison with MODLEN." Remote Sensing 10, no. 8 (2018): 1177. http://dx.doi.org/10.3390/rs10081177.

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The identification of subtle thermal anomalies (i.e., of low-temperature and/or spatial extent) at volcanoes by satellite is of great interest for scientists, especially because minor changes in surface temperature might reveal an unrest phase or impending activity. A good test case for assessing the sensitivity level of satellite-based methods is to study the thermal activity of Oldoinyo Lengai (OL) (Africa, Tanzania), which is the only volcano on Earth emitting natrocarbonatite lavas at a lower temperature (i.e., in the range 500–600 °C) than usual magmatic surfaces. In this work, we assess

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Costa, Bibiana Salvador Cabral da, and Eliana Lima da Fonseca. "The Use of Fire Radiative Power to Estimate the Biomass Consumption Coefficient for Temperate Grasslands in the Atlantic Forest Biome." Revista Brasileira de Meteorologia 32, no. 2 (2017): 255–60. http://dx.doi.org/10.1590/0102-77863220004.

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Abstract Every year, many active fire spots are identified in the satellite images of the southern Brazilian grasslands in the Atlantic Forest biome and Pampa biome. Fire Radiative Power (FRP) is a technique that uses remotely sensed data to quantify burned biomass. FRP measures the radiant energy released per time unit by burning vegetation. This study aims to use satellite and field data to estimate the biomass consumption rate and the biomass consumption coefficient for the southern Brazilian grasslands. Three fire points were identified in satellite FRP products. These data were combined w

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Somolinos, Florencio, González, and Cátedra. "Multi-Beam Circular Polarized Reflectarray on Parabolic Reflector by Variable Rotation Technique." Applied Sciences 9, no. 13 (2019): 2659. http://dx.doi.org/10.3390/app9132659.

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Multi-beams antennas are currently being used for direct broadcast satellite, personal communication satellite, military communication satellite, and high-speed internet applications. In this work, a circularly polarized (CP) multi-spot beam satellite parabolic reflectarray antenna is designed to provide six spot beams at 19.7 GHz. For this purpose, an easy technique to compute the required phase shifts to produce two focused beams in specular directions for a CP parabolic reflectarray is proposed. These required phase shifts are added to the reflected fields by the variable rotation of the re

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Jiang, Shun Yao, Qin Xue Xiong, and Jian Qiang Zhu. "Evaluation of Lake Eutrophication Based on the HJ-1 Satellite Multispectral Data." Applied Mechanics and Materials 519-520 (February 2014): 1184–87. http://dx.doi.org/10.4028/www.scientific.net/amm.519-520.1184.

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Chinese domestic satellite HJ-1 was launched in 2008, now it has become a significant resource for environment monitoring because its Multispectral data are characterized by 2-day temporal resolution, 30 m spatial resolution and 700 km breadth. A study case was made that HJ-1 multispectral data were used for retrieving aggregative trophic level index (TLI()) of water body of lakes in Wuhan, China. The aim of this study is to evaluate the probability of HJ-1 Multispectral data on estimating the eutrophic level of inland water. At first, the TLI() of sampling spots of some lakes in Wuhan were ca

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Grigoraș, Georgiana, and Bogdan Urițescu. "Spatial Hotspot Analysis of Bucharest’s Urban Heat Island (UHI) Using Modis Data." Annals of Valahia University of Targoviste, Geographical Series 18, no. 1 (2018): 14–22. http://dx.doi.org/10.2478/avutgs-2018-0002.

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Abstract The aim of the study is to find the relationship between the land surface temperature and air temperature and to determine the hot spots in the urban area of Bucharest, the capital of Romania. The analysis was based on images from both moderate-resolution imaging spectroradiometer (MODIS), located on both Terra and Aqua platforms, as well as on data recorded by the four automatic weather stations existing in the endowment of The National Air Quality Monitoring Network, from the summer of 2017. Correlation coefficients between land surface temperature and air temperature were higher at

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Fricker, Helen Amanda, Ted Scambos, Sasha Carter, Curt Davis, Terry Haran, and Ian Joughin. "Synthesizing multiple remote-sensing techniques for subglacial hydrologic mapping: application to a lake system beneath MacAyeal Ice Stream, West Antarctica." Journal of Glaciology 56, no. 196 (2010): 187–99. http://dx.doi.org/10.3189/002214310791968557.

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AbstractWe present an analysis of the active hydrologic system of MacAyeal Ice Stream (MacIS), West Antarctica, from a synthesis of multiple remote-sensing techniques: satellite laser altimetry; satellite image differencing; and hydrologic potential mapping (using a satellite-derived DEM and a bedrock DEM from airborne radio-echo sounding). Combining these techniques augments the information provided by each one individually, and allows us to develop a protocol for studying subglacial hydrologic systems in a holistic manner. Our study reveals five large active subglacial lakes under MacIS, the

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