Centre de documentation
scientifique

Pedestrian fowl prediction in open public places using graph convolutional network / Menghang Liu in ISPRS International journal of geo-information, vol 10 n° 7 (July 2021)  

Public [article]  inISPRS International journal of geo-information > vol 10 n° 7 (July 2021) . - n° 455 Titre : Pedestrian fowl prediction in open public places using graph convolutional network Type de document : Article/Communication Auteurs : Menghang Liu, Auteur ; Luning Li, Auteur ; Qiang Li, Auteur Année de publication : 2021 Article en page(s) : n° 455 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] espace public [Termes IGN] flux [Termes IGN] modèle de simulation [Termes IGN] navigation pédestre [Termes IGN] planification urbaine [Termes IGN] réseau neuronal de graphes [Termes IGN] Shenzhen [Termes IGN] variation temporelle Résumé : (auteur) Open public places, such as pedestrian streets, parks, and squares, are vulnerable when the pedestrians thronged into the sidewalks. The crowd count changes dynamically over time with various external factors, such as surroundings, weekends, and peak hours, so it is essential to predict the accurate and timely crowd count. To address this issue, this study introduces graph convolutional network (GCN), a network-based model, to predict the crowd flow in a walking street. Compared with other grid-based methods, the model is capable of directly processing road network graphs. Experiments show the GCN model and its extension STGCN consistently and significantly outperform other five baseline models, namely HA, ARIMA, SVM, CNN and LSTM, in terms of RMSE, MAE and R2. Considering the computation efficiency, the standard GCN model was selected to predict the crowd. The results showed that the model obtains superior performances with higher prediction precision on weekends and peak hours, of which R2 are above 0.9, indicating the GCN model can capture the pedestrian features in the road network effectively, especially during the periods with massive crowds. The results will provide practical references for city managers to alleviate road congestion and help pedestrians make smarter planning and save travel time. Numéro de notice : A2021-550 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi10070455 Date de publication en ligne : 02/07/2021 En ligne : https://doi.org/10.3390/ijgi10070455 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98073 [article]

Forest hydrology and watershed / Fan-Rui Meng (2019)  

Public Titre : Forest hydrology and watershed Type de document : Monographie Auteurs : Fan-Rui Meng, Auteur ; Altaf Arain, Auteur ; Qiang Li, Auteur ; et al., Auteur Editeur : Bâle [Suisse] : Multidisciplinary Digital Publishing Institute MDPI Année de publication : 2019 Importance : 208 p. Format : 17 x 25 cm ISBN/ISSN/EAN : 978-3-03921-385-6 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] bassin hydrographique [Termes IGN] Chine [Termes IGN] forêt ripicole [Termes IGN] forêt subalpine [Termes IGN] hydrologie [Termes IGN] modèle hydrographique [Termes IGN] Picea abies [Termes IGN] précipitation [Termes IGN] puits de carbone [Termes IGN] reboisement [Vedettes matières IGN] Végétation et changement climatique Résumé : (éditeur) Hydrological processes in forested watersheds are influenced by environmental, physiological, and biometric factors such as precipitation, radiation, temperature, species type, leaf area, and extent and structure of forest ecosystems. Over the past two centuries, forest coverage and forest structures have been impacted globally by anthropogenic activities, for example, forest harvesting, and conversion of forested landscapes for plantations and urbanization. In addition, since the industrial revolution, climate change has resulted in profound impacts on forest ecosystems due to higher carbon dioxide (CO2) concentration or CO2 fertilization, warmer temperatures, changes in frequency and intensity of extreme weather events and natural disturbances. As a result, hydrological processes in forested watersheds have been altered by these natural and anthropogenic factors and these changes are expected to accelerate due to future changing climatic conditions. Hence, understanding how various environmental, physiological, and physical drivers interactively influence hydrological and biogeochemical processes in forest ecosystems is critical for sustainable water supply in forested watersheds. About 21% of the global population depends on water sources that originate in forested catchments where forest coverage larger than 30%. Furthermore, there are knowledge gaps in our understanding of the mechanism of hydrological and hydrochemical cycles in forested watersheds. This Special Issue addresses these gaps in our knowledge and includes twelve papers in the following three major research themes in forest watershed areas. Note de contenu : 1- Biomass carbon sequestration potential by riparian forest in the Tarim River watershed, Northwest China: Implication for the mitigation of climate change impact 2- Spatial and temporal patterns in nonstationary flood frequency across a forest watershed: Linkage with rainfall and land use types 3- Quantifying impacts of forest recovery on water yield in two large watersheds in the cold region of Northeast China 4- Evaluation of the water-storage capacity of bryophytes along an altitudinal gradient from temperate forests to the Alpine zone 5- The hydrological impact of extreme weather-induced forest disturbances in a tropical experimental watershed in South China 6- Attribution analysis for runoff change on multiple scales in a humid subtropical basin dominated by forest, East China 7- The cumulative effects of forest disturbance and climate variability on streamflow in the Deadman River watershed 8- Two centuries-long streamflow reconstruction inferred from tree rings for the middle reaches of the Weihe River in Central China 9- Contrasting differences in responses of streamflow regimes between reforestation and fruit tree planting in a subtropical watershed of China 10- The radial growth of schrenk spruce (Picea schrenkiana Fisch. et Mey.) records the hydroclimatic changes in the Chu River basin over the past 175 years 11- Forest canopy can efficiently filter trace metals in deposited precipitation in a subalpine spruce plantation 12- Woody litter increases headwater stream metal export ratio in an Alpine forest Numéro de notice : 25956 Affiliation des auteurs : non IGN Thématique : FORET Nature : Monographie DOI : 10.3390/books978-3-03921-386-3 En ligne : https://doi.org/10.3390/books978-3-03921-386-3 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96424