21 papers · ranked by Valyu relevance
J. Sebastián Tello, Jonathan A. Myers, Manuel J. Macía, Alfredo F. Fuentes + 8 more
'Alfredo F. Fuentes' 'Leslie Cayola' 'Gabriel Arellano' 'M. Isabel Loza' 'Vania Torrez' 'Maritza Cornejo' 'Tatiana B. Miranda' 'Peter M. Jørgensen' 'Paul V. A. Fine'] Despite long-standing interest in elevational-diversity gradients, little is known about the processes that cause changes in the compositional variation…
Cédric Le Gentil, Mallikarjuna Vayugundla, Riccardo Giubilato, Wolfgang Stürzl + 2 more
'Wolfgang Stürzl' 'Teresa Vidal‐Calleja' 'Rudolph Triebel'] Abstract— The ability to recognize previously mapped locations is an essential feature for autonomous systems. Unstructured planetary-like environments pose a major challenge to these systems due to the similarity of the terrain. As a result, the ambiguity of…
Riccardo Giubilato, Cédric Le Gentil, Mallikarjuna Vayugundla, Martin J. Schuster + 2 more
'Martin J. Schuster' 'Teresa Vidal‐Calleja' 'Rudolph Triebel'] Simultaneous Localization and Mapping (SLAM) techniques play a key role towards longterm autonomy of mobile robots due to the ability to correct localization errors and produce consistent maps of an environment over time. Contrarily to urban or man-made…
Shuntaro Watanabe, Yuri Maesako, Tomoya Inada
Plant species richness is influenced by complex interactions between biotic and abiotic factors that operate on different spatial scales. Since spatial scales vary continuously in nature, it is expected that multiple factors simultaneously affect species richness and composition at an intermediate spatial scale (i.e.…
Francesco Sabatini, Borja Jiménez‐Alfaro, Sabina Burrascano, Andrea Lora + 1 more
'Andrea Lora' 'Milan Chytrý'] Beta-diversity has been repeatedly shown to decline with increasing elevation, but the causes of this pattern remain unclear, partly because they are confounded by coincident variation in alphaand gamma-diversity. We used 8,795 forest vegetation-plot records from the Czech National…
Richard Barnes, Clarence Lehman, D. J. Mulla
In processing raster digital elevation models (DEMs) it is often necessary to assign drainage directions over flats—that is, over regions with no local elevation gradient. This paper presents an approach to drainage direction assignment which is not restricted by a flat's shape, number of outlets, or surrounding…
Brian V. Smithers, Meagan F. Oldfather, Michael J. Koontz, Jim Bishop + 3 more
Examining community turnover across climate gradients at multiple scales is vital to understanding biogeographic response to climate change. This approach is especially important for alpine plants in which the relative roles of topographic complexity and non-climatic or stochastic factors vary across spatial scales. We…
Daniel Landskron, Johannes Böhm
Missing or incorrect consideration of azimuthal asymmetry of troposphere delays is a considerable error source in space geodetic techniques such as Global Navigation Satellite Systems (GNSS) or Very Long Baseline Interferometry (VLBI). So-called horizontal troposphere gradients are generally utilized for modeling such…
Giuseppe Amatulli, Daniel McInerney, Tushar Sethi, Peter Strobl + 1 more
'Sami Domisch'] Topographical relief comprises the vertical and horizontal variations of the Earth’s terrain and drives processes in geomorphology, biogeography, climatology, hydrology and ecology. Its characterisation and assessment, through geomorphometry and feature extraction, is fundamental to numerous…
Dan Zhu, Irfan Rashid, Katey Walter Anthony, Shujuan Tong + 8 more
Accurate accounting of aquatic methane emissions is critical for climate change mitigation, yet current global budgets overlook a key driver: the elevation-regulated atmospheric pressure. Here, we present the first large-scale investigation of methane ebullition across 164 shallow waters spanning elevations from sea…
Elkin A. Tenorio, Paola Montoya, Natalia Norden, Susana Rodríguez-Buriticá + 2 more
The latitudinal diversity gradient (LDG) is widely attributed to be the result of factors such as time, area, and energy. Although these factors explain most of the variation in lowlands, they fail in mountainous systems, which are biodiversity hotspots that may contribute meaningfully to the strength of the pattern…
Paul D.P. Pharoah
There are several functions that hikers can use to predict walking time based on elevation change or slope of the ground. The most commonly used is the Naismith function that was first published over 100 years ago. The availability of GPS devices to record tracks now make it possible to evaluate the performance of…
Elmira Berjisian, Alexander Bigazzi, Hamed Barkh, Quan Yuan
Road grade or slope is a key factor for walking and cycling behavior and outcomes (influencing route, speed, energy, etc.). For this reason, the scarcity of precise road grade data presents a challenge for travel information and analysis. This paper examines the accuracy of using crowd-sourced GPS data from a fitness…
Xinqiang Chen, Zhibin Li, Yinhai Wang, Zhiyong Cui + 3 more
'Huafeng Wu' 'Xiaolei Ma'] Grade variation on interstate highways affects the roadway geometric design, vehicle performance and driver behavior, thus possibly exerting an unexpected effect on vehicular speed. Hence, determining the internal relationship between grade and speed is important and useful for drivers…
Bin Zhang, ZeMeng Fan, ZhengPing Du, JiLin Zheng + 3 more
'NaNa Wang' 'Qing Wang'] Characterizing geomorphological patterns based on digital elevation models (DEMs) has become a basic focus of current geomorphology. A new DEM upscaling method based on the high-accuracy surface modelling method (HASM-US method) has been developed to improve the accuracy of current models and…
Yinsong Wang, Yajie Zou, Kristian Henrickson, Yinhai Wang + 3 more
'Jinjun Tang' 'Byung-Jung Park' 'Xiaolei Ma'] Roadway elevation data is critical for a variety of transportation analyses. However, it has been challenging to obtain such data and most roadway GIS databases do not have them. This paper intends to address this need by proposing a method to extract roadway elevation data…
Kai Xu
Elevation has long been the standard for quantifying the relief of mountains and other landforms on Earth and beyond. Nevertheless, elevation has its limitations. By itself, a location's elevation reveals little about its vertical position relative to its surroundings, especially for seabed and extraterrestrial…
Sarah Rutan, Kathryn Cash, Dwight Stoll II
The present work describes a re-parameterization of the Neue Kuss (NK) model for describing retention in liquid chromatography, and this re-parameterized model is used fit a large set of isocratic retention measurements with improved convergence properties relative to the original parameterization of the model. Next…
Devi Maheshwori, Shreyas Managave, Girish Jathar, Sham Davande
The regional variation of rainfall and length of the rainy season are identified to control the vegetation distribution in the Western Ghats (WG) of India, one of the important biodiversity hotspots. Here we demonstrate the existence of two new modes related to monsoonal climate and asymmetric solar heating that…
Michael Hutcheon, Andrew Teale
Algorithms are presented for performing a topological analysis of an arbitrary function, evaluated on an arbitrary grid of points. These algorithms work strictly by post-processing the data and require no additional function evaluations. This is achieved by connecting the grid points with a neighbourhood graph…
Timothy Wilson, Mark Eberhart
Bond bundles are chemical bonding regions, analogous to Bader atoms, uniquely defined according to the topology of the gradient bundle condensed charge density, itself obtained by a process of infinitesimal partitioning of the three-dimensional charge density into differential zero-flux surface bounded regions. Here we…