Results 11 to 20 of about 1,287 (187)

SIRGAS: Reference frame in Latin America [PDF]

, 2018
Fil: Mackern Oberti, María Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Sistema de Referencia Geocéntrico para las Américas; Alemania. Universidad "Juan Agustín Maza"; Argentina.
Cioce, Víctor, Martínez, Alex William, Mackern Oberti, María Virginia, Pérez, Roberto, de Freitas, Silvio   +4 more
core   +4 more sources

SIRGAS-WGIII activities for unifying height systems in Latin America

Revista Cartográfica, 2019
Since 1997 SIRGAS (Geocentric Reference System for the Americas) is acting for establishing a unified SIRGAS Vertical Reference System (SVRS) in Latin Ameri- ca and the Caribbean.
Silvio R.C. de Freitas
doaj   +2 more sources

Planes coordinates transformation between PSAD56 to SIRGAS using a Multilayer Artificial Neural Network [PDF]

Geodesy and Cartography, 2014
Dostęp do nowoczesnych technologii, w tym GNSS umożliwiły dokładniejsze zdefi niowanie systemów odniesień przestrzennych wykorzystywanych m.in. w defi niowaniu krajowych układów odniesień i układów współrzędnych.
Tierra Alfonso, Romero Ricardo
doaj   +2 more sources

Strains arising by seismic events in the SIRGAS-CON network region

Journal of Geodetic Science, 2013
In this study, we investigate surface strains related to seismic events and their relationship with pre- and post-seismic events in Latin America, by analyzing the variation of estimated earth coordinates supplied by a geodetic network called SIRGAS-CON.
Marotta G. S., França G. S., Monico J. F. G., Fuck R. A.   +3 more
doaj   +3 more sources

Metagenomics Reveals Microbial Community Shifts Associated With Contrasting Anthropogenic Impacts in Freshwater Sources of A Coastal Protected Area in Southeastern Brazil. [PDF]

Water Environ Res
Metagenomics revealed distinct anthropogenic signatures in the microbiome of freshwater sources on Marambaia Island, supported by the Anthropogenic Impact Index (AII). Impacted sites showed lower microbial diversity, enrichment of fecal‐associated taxa, and 14 antimicrobial resistance genes, whereas conductivity, salinity, and turbidity explained 88.1%
de Paula BB, Miagostovich MP, Mannarino CF, Ribeiro AVC, Lanzarini NM, de Oliveira CS, Novo SPC.   +6 more
europepmc   +2 more sources

Morphological and Histometric Alterations in Gonadal and Neural Tissues of Native and Non-Native Fishes From the Lower Doce River Basin in Southeastern Brazil. [PDF]

Anat Histol Embryol
ABSTRACT The ichthyofauna of the lower Doce River basin has been exposed to multiple anthropogenic stressors. Among these, the collapse of the Fundão mining tailings dam in Mariana, Minas Gerais, Brazil, in 2015 resulted in massive fish mortality and widespread contamination of aquatic environments.
Marcon L, Souza KL, Travenzoli NM, Rosa GR, de Almeida Santos ML, Ferreira WR, Coelho PN, Dos Santos JAD, Henschel E.   +8 more
europepmc   +2 more sources

Shifting in the shadows: Morphofunctional variations of Miconia sellowiana Naudin (Melastomataceae) associated with cave environments. [PDF]

Plant Biol (Stuttg)
Cave environments filter plant traits, selecting thinner, smaller leaves with reduced photosynthetic and vascular structures. Abstract Caves present unique ecological conditions that influence the distribution and adaptation of species, yet studies on cave‐associated vegetation remain limited.
Rosa GH, Cardoso RC, Ferreira RL, Souza-Silva M.   +3 more
europepmc   +2 more sources

Primeros veinte años de SIRGAS [PDF]

, 2021
Se sintetizan los acontecimientos que jalonaron los primeros veinte años del “Sistema de Referencia Geocéntrico para las Américas” (SIRGAS), a la vez que se rinde un tributo a las instituciones y personalidades que los han hecho posibles.
Brunini, Claudio Antonio, Sánchez, Laura   +1 more
core  

Improving SIRGAS Ionospheric Model [PDF]

, 2022
The IAG Sub-Commission 1.3b, SIRGAS (Sistema de Referencia Geoce´ntrico para las Ame´ricas), operates a service for computing regional ionospheric maps based on GNSS observations from its Continuously Operating Network (SIRGAS-CON). The ionospheric model
Gularte Scarone, Ángela Erika, Brunini, Claudio Antonio, Azpilicueta, Francisco Javier, Gende, Mauricio Alfredo, Camilion, Emilio   +4 more
core  

Assessment of hybrid geoids in Chile and Spain, combining GGM and GNSS/Leveling observations

Geodesy and Geodynamics, 2021
This research presents the results for analyses done to five geopotential global models (GGM), comparing them with ground data from GNSS and leveling in heterogenic zones from the geodetic perspective, in Chile and Spain.
José Antonio Tarrío Mosquera, Marcelo Caverlotti Silva, Fernando Isla, Carlos Prado   +3 more
doaj   +1 more source