Tools and methods for capturing Twitter data during natural disasters

Bruns, Axel; Liang, Yuxian Eugene

doi:10.5210/fm.v17i4.3937

Cited by 187 publications

(166 citation statements)

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“…This was despite the majority of the affected area suffering from cloud cover, suggesting that in events with less cloud cover this time could potentially be reduced to just a few days. The proliferation of rapidly available crowdsourced data from unconventional but quickly available sources such as social media may also be used to inform this model (Earle et al, 2010;Bruns and Liang, 2012). Importantly, however, the results herein suggest that when cloud-free imagery is available for the majority of the affected region, systematically mapping from this imagery in considerable detail, as is currently done, is not required.…”

Section: Potential Speed Of Applicationmentioning

confidence: 81%

Rapid post-earthquake modelling of coseismic landslide intensity and distribution for emergency response decision support

Robinson

Rosser

Densmore

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. Current methods to identify coseismic landslides immediately after an earthquake using optical imagery are too slow to effectively inform emergency response activities. Issues with cloud cover, data collection and processing, and manual landslide identification mean even the most rapid mapping exercises are often incomplete when the emergency response ends. In this study, we demonstrate how traditional empirical methods for modelling the total distribution and relative intensity (in terms of point density) of coseismic landsliding can be successfully undertaken in the hours and days immediately after an earthquake, allowing the results to effectively inform stakeholders during the response. The method uses fuzzy logic in a GIS (Geographic Information Systems) to quickly assess and identify the location-specific relationships between predisposing factors and landslide occurrence during the earthquake, based on small initial samples of identified landslides. We show that this approach can accurately model both the spatial pattern and the number density of landsliding from the event based on just several hundred mapped landslides, provided they have sufficiently wide spatial coverage, improving upon previous methods. This suggests that systematic high-fidelity mapping of landslides following an earthquake is not necessary for informing rapid modelling attempts. Instead, mapping should focus on rapid sampling from the entire affected area to generate results that can inform the modelling. This method is therefore suited to conditions in which imagery is affected by partial cloud cover or in which the total number of landslides is so large that mapping requires significant time to complete. The method therefore has the potential to provide a quick assessment of landslide hazard after an earthquake and may therefore inform emergency operations more effectively compared to current practice.

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Section: Potential Speed Of Applicationmentioning

confidence: 81%

Rapid post-earthquake modelling of coseismic landslide intensity and distribution for emergency response decision support

Robinson

Rosser

Densmore

et al. 2017

Nat. Hazards Earth Syst. Sci.

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“…In this sense, content and communication shared by citizens through social media is influencing different sectors. For instance, the information is taken into account in business and marketing (Khang, Ki & Ye, 2012) as well as for the political agenda (Bastos, Raimundo & Travitzki, 2013;Torres-Nabel, 2015), news covered in media (Broersma & Graham, 2013) or as a crucial means in natural disasters in order to save lives (Bruns & Liang, 2012) among others.…”

Section: Methodology For the Identification Of The Relevance Of Reseamentioning

confidence: 99%

Vol. 6, Num. 1 - Full Issue

Serradell

2017

RIMCIS

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Despite much research done on language learning textbooks, there still exist several questions unanswered about what these textbooks' contents are about. This study is thus an attempt to investigate the 15 reading passages of "Ready for First Certificate of English" (FCE) in the light of schema theory. In doing so, the microstructural approach to schema theory was taken into the account which led to the classification of 8617 schema tokens into the three main categories of syntactic, semantic, and parasyntactic domains. Running the chi-square test revealed that the domains differ significantly from each other regarding both their types (X 2 = 2869.9, p< 0.05) and tokens (X 2 = 1704, p< 0.05) which lent support to their psychological reality. In addition, the descriptive analysis of the schemata demonstrated that reading passages are heavily outweighed by semantic types (80.7%), whereas syntactic and parasyntactic types formed only about 6% and 12.4% of the textbook, respectively. The pedagogical implication of the study is discussed and further suggestions are put forward.Keywords: schema theory, microstructural approach, semantic domain, syntactic domain, parasyntactic domain RIMCIS -International and Multidisciplinary Journal of Social Sciences Vol. 6 No.1 March 2017 pp. 1-22 Atena Attaran Ferdowsi University of Mashhad ResumenA pesar que los libros de texto para el aprendizaje de idiomas se ha investigado mucho, aún hay varias cuestiones sin responder acerca de la temática de su contenido. Este estudio es, pues, un intento de investigar los quince fragmentos de lectura del "Ready for First Certificate of English" (FCE) a la luz de la teoría del esquema. De esta manera, se tuvo en cuenta una perspectiva microestructural de la teoría del esquema lo que condujo a la clasificación de 8617 muestras de esquemas en las tres principales categorías de los dominios sintáctico, semántico y parasintáctico. La prueba del chi-cuadrado mostró que los dominios difieren significativamente los unos de los otros teniendo en cuenta tanto su tipo (X2=2869.9, p<0.05) como su muestra (X2=1704, p<0.05) lo que condujo a reforzar su realidad psicológica. Así mismo, el análisis descriptivo de los esquemas demostró que los fragmentos de lectura están fuertemente sobreponderados por los tipos semánticos (80.7%), mientras que que los tipos sintáctico y parasintáctico conforman sólo alrededor del 6% y el 12.4% respectivamente de los libros de texto. Se debaten las implicaciones pedagógicas del estudio y se avanzan sugerencias para futuras investigaciones.Palabras clave: teoría del esquema, perspectiva microestructural, dominio semántico, dominio sintáctico, dominio parasintáctico Sciences, 6(1) 3 he saliency of textbooks in English language teaching (ELT henceforth) classes cannot be ignored due to their importance in providing language input and practices for language learners (Richards, 2001). Textbooks as the "visible part of any ELT program" (Sheldon, 1988) are the means of consistency in the language learning process an...

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“…boyd, et al (2010) described the topic function of hashtags, Huang, et al (2010) explored the conversational nature of Twitter tags, and Bruns and Liang (2012) discussed how Twitter was used by the public to exchange information related to natural disasters in Australia. Although most literature on hashtags focuses on the context rather than the geographic information provided, previous investigations have explored the overlap between hashtag and geographic location.…”

Section: Previous Workmentioning

confidence: 99%

Taking tweets to the streets: A spatial analysis of the Vinegar Protests in Brazil

Bastos

Recuero

Zago

2014

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In this paper we investigate the relationship between the geographic location of protestors attending demonstrations in the 2013 Vinegar protests in Brazil and the geographic location of users that tweeted the protests. We explored the overlap between different sources of geographic information from Twitter -namely geocode, hashtag, and user profileprovided by multiple samples drawn from a population of three million tweets related to the events and compared the data to the location of protestors attending the street demonstrations. We adjusted the data for the uneven distribution of the population and performed geospatial and spatial clustering analysis over sets of spatial locations. We found evidence for the hypotheses that users tweeting the protests are geographically distant from the street protests and that users from geographically isolated areas rely on Twitter hashtags to remotely engage in the demonstrations.

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Tools and methods for capturing Twitter data during natural disasters

Cited by 187 publications

References 0 publications

Rapid post-earthquake modelling of coseismic landslide intensity and distribution for emergency response decision support

Rapid post-earthquake modelling of coseismic landslide intensity and distribution for emergency response decision support

Vol. 6, Num. 1 - Full Issue

Taking tweets to the streets: A spatial analysis of the Vinegar Protests in Brazil

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