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| Vanzela,Luiz S.; Araujo Junior,Osvaldo; Lima,Ronaldo C.. |
| ABSTRACT Considering the importance of topographic surveys to determine soil volumes and study efficient and accessible alternatives for this operation, this study aimed to analyze methods and respective equipment for planialtimetric surveys to determine soil volume. An experimental grid was installed in an area locate in Fernandópolis, SP, Brazil, in which quotas were measured by geometric leveling (standard method), trigonometric leveling, leveling with receivers of the Global Navigation Satellite System (GNSS) by relative (frequencies L1/L2) and absolute positioning (code C/A) and extraction of altitudes in digital terrain model from SRTM and ASTER images. In comparison to geometric leveling, trigonometric leveling was the most accurate in determining... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: GNSS; Geometric leveling; Trigonometric leveling; Geomatics. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000200207 |
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| Oliveira,Tiago C. A.; Molin,José P.. |
| Sistemas de piloto automático vêm sendo utilizados com relativa frequência na agricultura brasileira. Na citricultura, o uso dessa tecnologia vem difundindo-se na operação de abertura de sulcos para o transplantio de mudas. O presente trabalho teve como objetivos avaliar a acurácia de um piloto automático e avaliar possíveis ganhos gerados pela utilização dessa tecnologia de orientação automática em relação ao sistema convencional de abertura de sulcos na implantação de lavoura de citros. A primeira etapa consistiu em georreferenciar as plantas no campo, três meses após o transplantio, com sulcos feitos com as duas tecnologias. Na segunda etapa do trabalho, foi conduzida a avaliação da capacidade operacional da operação de abertura de sulcos, com e sem a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultura de precisão; Sistemas guia; GNSS. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000200013 |
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| Santos,Adão F. dos; Correa,Lígia N.; Gírio,Lucas A. S.; Paixão,Carla S. S.; Silva,Rouverson P. da. |
| ABSTRACT The use of automatic routing significantly increases the yield and quality of agricultural operations and reduces the overlap rates between the mechanized set passes during the operation. The objective of this study was to analyse the quality of peanut sowing using automatic routing in two paths, curved and rectilinear, based on the error of parallelism and execution error, through statistical process control. The maps used came from an area of peanut seed production, in the city of Luzitânia, São Paulo, Brazil. The sowing was carried out by the execution of a project elaborated in CAD software that, for its elaboration, was taken into consideration the working width of the seeder-fertilizer, as well as the spacing of the crop. The CenterPoint RTX... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision agriculture; Peanut; GNSS; Parallelism; RTX. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400568 |
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| Cardellach, Estel; Wickert, Jens; Baggen, Rens; Benito, Javier; Camps, Adriano; Catarino, Nuno; Chapron, Bertrand; Dielacher, Andreas; Fabra, Fran; Flato, Greg; Fragner, Heinrich; Gabarro, Carolina; Gommenginger, Christine; Haas, Christian; Healy, Sean; Hernandez-pajares, Manuel; Hoeg, Per; Jaggi, Adrian; Kainulainen, Juha; Khan, Shfaqat Abbas; Lemke, Norbert M. K.; Li, Weiqiang; Nghiem, Son V.; Pierdicca, Nazzareno; Portabella, Marcos; Rautiainen, Kimmo; Rius, Antonio; Sasgen, Ingo; Semmling, Maximilian; Shum, C. K.; Soulat, Francois; Steiner, Andrea K.; Tailhades, Sebastien; Thomas, Maik; Vilaseca, Roger; Zuffada, Cinzia. |
| The global navigation satellite system (GNSS) Transpolar Earth Reflectometry exploriNg system (G-TERN) was proposed in response to ESA's Earth Explorer 9 revised call by a team of 33 multi-disciplinary scientists. The primary objective of the mission is to quantify at high spatio-temporal resolution crucial characteristics, processes and interactions between sea ice, and other Earth system components in order to advance the understanding and prediction of climate change and its impacts on the environment and society. The objective is articulated through three key questions. 1) In a rapidly changing Arctic regime and under the resilient Antarctic sea ice trend, how will highly dynamic forcings and couplings between the various components of the ocean,... |
| Tipo: Text |
Palavras-chave: Polar science; GNSS; Reflectometry; GNSS-R; Sea ice; Altimetry; Polarimetry; Radio-occultation; Low Earth Orbiter. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00438/54994/56411.pdf |
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| Wickert, Jens; Andersen, O.; Bandeiras, J.; Bertino, L.; Cardellach, E.; Camps, A.; Catarino, N.; Chapron, Bertrand; Foti, G.; Gommenginger, C.; Hatton, J.; Hoeg, P.; Jaeggi, A.; Kern, M.; Lee, T.; Martin-neira, M.; Park, H.; Pierdicca, N.; Rosello, J.; Semmling, M.; Shum, C. K.; Zuffada, C.; Soulat, F.; Sousa, A.; Xi, J.. |
| GEROS-ISS (GEROS hereafter) stands for GNSS REflectometry, Radio Occultation and Scatterometry onboard the International Space Station. It is a scientific experiment, proposed to the European Space Agency (ESA) in 2011 for installation aboard the ISS. The main focus of GEROS is the dedicated use of signals from the currently available Global Navigation Satellite Systems (GNSS) for remote sensing of the System Earth with focus to Climate Change characterisation. The GEROS mission idea and the current status are briefly reviewed. |
| Tipo: Text |
Palavras-chave: GNSS; Reflectometry; ISS; Sea Surface Height; Oceanography. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00377/48799/49606.pdf |
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| Santos,Adão F. dos; Silva,Rouverson P. da; Tavares,Tiago O.; Ormond,Antonio T. S.; Rosalen,David L.; Assis,Leonardo C. de. |
| ABSTRACT GNSS positioning errors are certain, regardless of the adopted positioning method. In agriculture, these errors may represent higher or lower overlapping rates between passes of a mechanical assembly, affecting operation quality. Therefore, this study evaluated the main errors arising from peanut sowing operation performed with an auto-steer guidance system by an RTX signal, using the Statistical Process Control techniques. The errors evaluated were: in tractor lateral displacement, project execution, and parallelism between passes of tractor-seeder set. The average errors of project execution in all passes were within the range specified by the manufacturer, i.e. lower than 3.8 cm. The average error of tractor-seeder set was also within the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Autopilot; Precision agriculture; Electric auto-steering; RTX; GNSS. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001000731 |
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