Search results for "Spatial"
showing 10 items of 2121 documents
Comparative analysis of different techniques for spatial interpolation of rainfall data to create a serially complete monthly time series of precipit…
2011
Abstract The availability of good and reliable rainfall data is fundamental for most hydrological analyses and for the design and management of water resources systems. However, in practice, precipitation records often suffer from missing data values mainly due to malfunctioning of raingauge for specific time periods. This is an important issue in practical hydrology because it affects the continuity of rainfall data and ultimately influences the results of hydrologic studies which use rainfall as input. Many methods to estimate missing rainfall data have been proposed in literature and, among these, most are based on spatial interpolation algorithms. In this paper different spatial interpo…
Spatial Allocation of European Structural Funds: What Is the Role of Strategic Interactions?
2020
This chapter explores the role of strategic interactions that affect the spatial allocation of structural funds in the European Union. More specifically, this chapter seeks to test if the interactions between government decisions are strategic substitutes or complements in the context of the European structural funds allocation. First, we present a theoretical model which depicts how the strategic interactions could affect the allocation of public grants in a bargaining process. Then, we test the direction of strategic interaction on the allocation of structural funds for the 2000–2006 programming period using spatial econometric techniques. We find a negative spatial interaction between Eu…
Organisation spatiale et densités urbaines : une application à l'agglomération du Grand Dijon
2017
Cet article s’intéresse aux différentes formes et mesures de l’intensité de l’occupation de l’espace. Bien que l’indicateur le plus utilisé soit le ratio de densité brut de population, cet indicateur n’est pas suffisant pour qualifier l’occupation d’un espace. En effet, la densité revêt de multiples facettes. Il est possible de distinguer des densités de contenants (bâti) et de contenu (population, emplois) et différentes mesures peuvent être mobilisées pour quantifier cette occupation spatiale. Nous nous proposons dans cet article de mesurer et qualifier les densités urbaines – de population et de bâti – en proposant une mesure plus juste de l’intensité de l’occupation de l’espace au trave…
The household location in multicenter urban spaces
1991
In multicenter urban spaces, the household location problem is to find an optimal location taking into account the locations of several economic centers.In this article, we show that the usual model, maximizing a residential utility under a budget spatial constraint, can’t give a satisfactory solution.So, we construct a fuzzy spatial model, including imprecision in consumer’s behavior. This model allows us to find an optimal location in a multicenter urban setting. Then, an empirical study illustrates the performances of the fuzzy model.
Land-sea interactions: case studies from the Baltic Sea Region
2021
Research background: Nowadays, mainstream discussions on maritime spatial planning (MSP) are tightly intertwined with the discourse on governance for land-sea interactions or interface (LSI), using multi-scalar and cross-sectoral governance systems. At the same time, principles with legal rank need to be respected and applied in both MSP and LSI and their respective governance structures while putting coastal communities at the centre and taking into consideration the process of “maritimisation.” In combination, these factors contribute to augmenting the pressure of competing uses both on land and sea in the frame of the Blue Economy. As an exemplary forerunner in the field of MSP, the Balt…
The distribution of sexual reproduction of the geographic parthenogenEucypris virens(Crustacea: Ostracoda) matches environmental gradients in a tempo…
2013
Niche segregation may prevent competitive exclusion and promote local coexistence. This typically results in the occupation of different habitats. In the freshwater ostracod Eucypris virens (Jurine, 1820), the distribution of sexual and parthenogenetic populations in the temporary Lake Caracuel, central Spain, was not homogeneous. Parthenogens were found everywhere including the littoral, whereas sexuals were restricted to the centre. We investigated the hypothesis that spatial distribution responded to ecological differences. We studied the ecological significance of this segregation by linking environmental data to male presence, sexual fraction, ploidy, and genetic structure of our model…
Assessment of the interpretability of data mining for the spatial modelling of water erosion using game theory
2021
Abstract This study undertook a comprehensive application of 15 data mining (DM) models, most of which have, thus far, not been commonly used in environmental sciences, to predict land susceptibility to water erosion hazard in the Kahorestan catchment, southern Iran. The DM models were BGLM, BGAM, Cforest, CITree, GAMS, LRSS, NCPQR, PLS, PLSGLM, QR, RLM, SGB, SVM, BCART and BTR. We identified 18 factors usually considered as key controls for water erosion, comprising 10 factors extracted from a digital elevation model (DEM), three indices extracted from Landsat 8 images, a sediment connectivity index (SCI) and three other intrinsic factors. Three indicators consisting of MAE, MBE, RMSE, and…
Synthetic individual binaural audio delivery by pinna image processing
2014
Purpose – The purpose of this paper is to present a system for customized binaural audio delivery based on the extraction of relevant features from a 2-D representation of the listener’s pinna. Design/methodology/approach – The most significant pinna contours are extracted by means of multi-flash imaging, and they provide values for the parameters of a structural head-related transfer function (HRTF) model. The HRTF model spatializes a given sound file according to the listener’s head orientation, tracked by sensor-equipped headphones, with respect to the virtual sound source. Findings – A preliminary localization test shows that the model is able to statically render the elevation of a vi…
Modelling the presence of disease under spatial misalignment using Bayesian latent Gaussian models.
2015
Modelling patterns of the spatial incidence of diseases using local environmental factors has been a growing problem in the last few years. Geostatistical models have become popular lately because they allow estimating and predicting the underlying disease risk and relating it with possible risk factors. Our approach to these models is based on the fact that the presence/absence of a disease can be expressed with a hierarchical Bayesian spatial model that incorporates the information provided by the geographical and environmental characteristics of the region of interest. Nevertheless, our main interest here is to tackle the misalignment problem arising when information about possible covar…
Poor prenatal care in an urban area: a geographic analysis.
2009
Abstract Poor prenatal care increases the risk of having a premature or low-birth-weight infant. Rates of poor prenatal care vary spatially, influenced not only by individual mothers’ characteristics but also by social neighborhood context and proximity to healthcare services. The aim of this article is to identify and map the spatial patterns of prenatal care and to analyze the spatial and social origins of such inequalities. Our study concerns 30,338 individuals who received antenatal care in a highly urbanized French district: Seine-Saint-Denis. The geographical distribution of poor prenatal care is revealed by exploratory spatial data analysis tools. This spatial clustering is related t…