Spatial modelling from line-transect survey data
inlabru : an R package for Bayesian spatial modelling from ecological survey data
... distinguished from methods and software that fit density surfaces to count data in that it can deal with points as responses in continuous space and does not require that space be discretised (although ...
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Spatial and Spatio-Temporal Multidimensional Data Modelling: A Survey
... This example shows that all geometries of the object class Water stream could be represented either by a linear or a polygonal geometry depending on certain geometric rules. In fact, the Water stream section is presented ...
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Line Transect Methods for Plant Surveys
... estimated from the between-segment sample ...in line transect sampling, the lines would be resampled (Buckland et ...the data within each intersection square need to be kept intact for some of ...
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Modelling of spatial effects in count data
... of spatial statistics have been widely applied in fields like biometrics and geostatis- tics after Whittle (1954) introduced the first spatial ...models. Spatial econometrics, however, has only been ...
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Designing a shipboard line transect survey to estimate cetacean abundance off the Azores Archipelago, Portugal
... THE SURVEY STRATA Given information on cetacean spatial distribution is scarce, the three strata initially created to account for possible gradients with respect to distance from shore were put ...
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Double-observer line transect methods : levels of independence
... mark-recapture data, these have inherent problems for estimating abundance in the presence of ...methods, line transect methods use knowledge of the distribution of a covariate which affects ...
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On the spatial modelling of mixed and constrained geospatial data
... geospatial data is a common challenge for geoscience ...and spatial patterns buried deep in the high-dimensional compositional ...a spatial predictive model for classification of surficial and deep ...
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Global coverage of cetacean line transect surveys : status quo, data gaps and future challenges
... and spatial planning. We compiled a geo-spatial database of published data on cetacean abundance from dedicated visual line-transect surveys and encoded ...species from ...
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Optimization of Coral Video Transect Technique for Coral Reef Survey: Comparison with Intercept Transect Technique
... m transect at the sampling area. The first data collection was done us- ing LIT method along 20 m × 4 segment transects as outlined in ...[12]. Data were recorded by moving slowly along the ...
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State space approach to evaluate spatial variability of field measured soil water status along a line transect in a volcanic vesuvian soil
... the modelling of water trans- port processes in unsaturated heterogeneous porous media require further in-depth studies above all with regard to dif- ferent pedological contexts from those here ...
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Using hidden Markov models to deal with availability bias on line transect surveys
... the survey, electronic depth-recording tags were attached to eight bow- head whales from the population surveyed, generating time series of durations between ...the survey was how best to estimate ...
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Accommodating availability bias on line transect surveys using hidden Markov models
... aerial survey of whales on which only perpendicular distances were ...estimated from tags placed on 12 separate ...distance data only was fitted to the data by maximum likelihood, treating θ f ...
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Global analysis of cetacean line transect surveys : detecting trends in cetacean density
... available data to detect trends in abundance. Often long-term data from repeated surveys are lacking, and alterna- tive approaches to trend detection must be ...of line- transect ...
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Determinants of delays in travelling to an emergency obstetric care facility in Herat, Afghanistan: an analysis of cross sectional survey data and spatial modelling
... in modelling urban travel times ...geographical data at the time of the study; many settle- ments had moved due to the war, tribal disputes, and drought, and residents affected by such calamities are likely ...
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Spatial Data Warehouse Modelling
... complex spatial objects, we mean objects that cannot be represented in terms of simple geometries, like points and ...Complex spatial objects are, for example, continuous fields, objects with topology, ...
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Detecting ecological regime shifts from transect data
... A potential limitation in using CLSs to detect regime shifts is that a shift is only detected if there is a clear change in the CLS that emerges from the system dynamics. It is theoretically possible that a shift ...
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A Survey: On Spatial Data Mining
... geo- spatial data and using visual tools for consequent communication, knowledge recovery and synthesis ...for data correspondence while geovisualization emphasizes on data investigation ...
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Design and analysis of line transect surveys for primates
... In the simulation study, we selected the model chosen by AIC, yet despite obvious overfitting in some cases, estimation was still good. Upward bias in line transect sampling can occur from a source ...
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Modelling oil price expectations: evidence from survey data
... sub-periods from the set of relevant information because it does not allow to reduce the forecast ...shifting from about 20 $/barrel at the beginning of the period to reach 80 $/barrel towards the end of ...
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Assessing the effects of measurement errors in line transect sampling
... A simulation study was carried out in which known amount of measurement error can be added to error-free line transect data (i.e. true perpendicular distances) to determine the effects o[r] ...
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