Search results for: Philippe De Maeyer

Items from 1 to 20 out of 54 results

article

Future changes of drought characteristics in Coupled Model Intercomparison Project phase 6 Shared Socioeconomic Pathway scenarios over Central Asia

Hao Guo, Shanfeng He, Min Li, Anming Bao, more

International Journal of Climatology > 42 > 7 > 3888 - 3908

Understanding of future changes in drought characteristics is crucial for climate change adaptation and drought impact mitigation. We analysed the projected changes in drought characteristics relative to historical drought conditions in Central Asia using the Standardized Precipitation Evapotranspiration Index based on both gridded observations and an ensemble of bias‐corrected and spatially disaggregated...

article

Simulation of site‐scale water fluxes in desert and natural oasis ecosystems of the arid region in Northwest China

Mingjuan Xie, Geping Luo, Olaf Hellwich, Amaury Frankl, more

Hydrological Processes > 35 > 12 > n/a - n/a

The study of water fluxes is important to better understand hydrological cycles in arid regions. Data‐driven machine learning models have been recently applied to water flux simulation. Previous studies have built site‐scale simulation models of water fluxes for individual sites separately, requiring a large amount of data from each site and significant computation time. For arid areas, there is no...

article

Quantitative analysis of the driving factors for groundwater resource changes in arid irrigated areas

Chenyu Guo, Tie Liu, Yaxuan Niu, Zhibin Liu, more

Hydrological Processes > 35 > 1 > n/a - n/a

How to quantify the impact of climate change and human activities on groundwater is not only a hot topic of current research but also a key point of water resource management in arid irrigated areas. Therefore, this paper analyzes the changes in the trends of land use, climate, and groundwater extraction in the Yanqi Basin in recent years and uses the distributed hydrological model MIKE‐SHE to quantitatively...

article

The sensitivity of global surface air temperature to vegetation greenness

Xiuliang Yuan, Rafiq Hamdi, Friday Uchenna Ochege, Alishir Kurban, more

International Journal of Climatology > 41 > 1 > 483 - 496

Terrestrial vegetation plays a crucial role in governing the land surface energy budget, which in turn drives the climate of the Earth. The climatic feedbacks of vegetation changes are different across vegetation greenness gradients and climatological conditions, which has not been studied clearly. In this study, we used remote sensing and re‐analysis datasets to investigate global climatic feedbacks...

article

Spatiotemporal characteristics of future changes in precipitation and temperature in Central Asia

Min Luo, Tie Liu, Fanhao Meng, Yongchao Duan, more

International Journal of Climatology > 39 > 3 > 1571 - 1588

The arid and semi‐arid areas in Central Asia have scarce water resources and fragile ecosystems that are especially sensitive and vulnerable to climate change. Reliable information regarding future projections of change in climate is crucial for long‐term planning of water resources management and structural adjustment of agriculture in this region. However, the low‐density meteorological observation...

article

Spatial and temporal characteristics of droughts in Central Asia during 1966–2015

Hao Guo, Anming Bao, Tie Liu, Guli· Jiapaer, more

Science of The Total Environment > 2018 > 624 > C > 1523-1538

In drought-prone regions like Central Asia, drought monitoring studies are paramount to provide valuable information for drought risk mitigation. In this paper, the spatiotemporal drought characteristics in Central Asia are analyzed from 1966 to 2015 using the Climatic Research Unit (CRU) dataset. Drought events, as well as their frequency, duration, severity, intensity and preferred season, are studied...

article

Defining spatiotemporal characteristics of climate change trends from downscaled GCMs ensembles: how climate change reacts in Xinjiang, China

Min Luo, Tie Liu, Amaury Frankl, Yongchao Duan, more

International Journal of Climatology > 38 > 5 > 2538 - 2553

The fragile ecosystem, scarce water resources, and limited ecosystem resilience of Xinjiang, China make the region especially vulnerable to climate change. Researchers need reliable analyses of climate change trends to formulate regional mitigation and adaption strategies and to support sustainable development. Therefore, two statistical downscaling methods and the combination of a Mann–Kendall test...

article

Climate change in the Tianshan and northern Kunlun Mountains based on GCM simulation ensemble with Bayesian model averaging

Jing Yang, Gonghuan Fang, Yaning Chen, Philippe De-Maeyer

Journal of Arid Land > 2017 > 9 > 4 > 622-634

Climate change in mountainous regions has significant impacts on hydrological and ecological systems. This research studied the future temperature, precipitation and snowfall in the 21^st century for the Tianshan and northern Kunlun Mountains (TKM) based on the general circulation model (GCM) simulation ensemble from the coupled model intercomparison project phase 5 (CMIP5) under the representative...

article

Information flows as bases for archeology‐specific geodata infrastructures: An exploratory study in flanders

Berdien De Roo, Philippe De Maeyer, Jean Bourgeois

Journal of the Association for Information Science and Technology > 67 > 8 > 1928 - 1942

Accurate and detailed data recording is indispensable for documenting archeological projects and for subsequent information exchange. To prevent comprehension and accessibility issues in these cases, data infrastructures can be useful. The establishment of such data infrastructures requires a clear understanding of the business processes and information flows within the archeological domain. This...

chapter

Determining geometric primitives for a 3D GIS easy as 1D, 2D, 3D?

Britt Lonneville, Cornelis Stal, Berdien De Roo, Alain De Wulf, more

2015 1st International Conference on Geographical Information Systems Theory, Applications and Management (GISTAM) > 1 - 6

2015 1st International Conference on Geographical Information Systems Theory, Applications and Management (GISTAM)

Acquisition techniques such as photo modelling, using SfM-MVS algorithms, are being applied increasingly in several fields of research and render highly realistic and accurate 3D models. Nowadays, these 3D models are mainly deployed for documentation purposes. As these data generally encompass spatial data, the development of a 3D GIS would allow researchers to use these 3D models to their full extent...

chapter

Procedural city model using multi-source parameter estimation

Cornelis Stal, Britt Lonneville, Philippe De Maeyer, Annelies Vandenbulcke, more

2015 1st International Conference on Geographical Information Systems Theory, Applications and Management (GISTAM) > 1 - 6

2015 1st International Conference on Geographical Information Systems Theory, Applications and Management (GISTAM)

Most current digital 3D city modelling procedures have either a low degree of automation or require specialized skills. Moreover, the construction process is the result of an equilibrium between the desired level of detail on the one hand and modelling performance on the other hand. Although environmental 3D models and 3D city models in particular are essential for a wide range of applications and...

chapter

Estimating grondwater nutrients using hyperspectral satellite imagery in the flemish meuse-valley

Cornelis Stal, Philippe De Maeyer, An De Schrijver, Mieke Paelinck, more

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) > 3114 - 3117

IGARSS 2016 - 2016 IEEE International Geoscience and Remote Sensing Symposium

In order to improve European biodiversity, natural habitats need to be restored and improved within a large European network of protected areas (Natura 2000). Therefore, agricultural land often needs to be converted to nature. Lowering soil nitrogen and phosphorus levels appears to be a necessary prerequisite for a successful restoration. To select which agricultural fields are most suitable for conversion...

article

Spatiotemporal data as the foundation of an archaeological stratigraphy extraction and management system

Berdien De Roo, Cornelis Stal, Britt Lonneville, Alain De Wulf, more

Journal of Cultural Heritage > 2016 > 19 > C > 522-530

Transforming relations between stratigraphic units of an archaeological excavation to a formal model like the Harris Matrix is a challenging task. Especially when the number of stratigraphic units is large or when spatiotemporal relations are complex, such models are difficult to generate. This paper describes a novel procedure for the automated construction of Harris Matrices involving the use of...

article

Identifying public transport gaps using time-dependent accessibility levels

Koos Fransen, Tijs Neutens, Steven Farber, Philippe De Maeyer, more

Journal of Transport Geography > 2015 > 48 > Complete > 176-187

One of the concerns that has aroused much scholarly attention in transport geography lately is the extent to which public transport provision enables the less privileged population segments, especially those without privately owned motorized vehicles, to participate in activities that are deemed normal within the society they live in. This study contributes to this line of inquiry by proposing a methodology...

article

Examining commuting patterns using Floating Car Data and circular statistics: Exploring the use of new methods and visualizations to study travel times

Bart Dewulf, Tijs Neutens, Mario Vanlommel, Steven Logghe, more

Journal of Transport Geography > 2015 > 48 > Complete > 41-51

In this paper, we focus on the spatial distribution of travel time differences between car and public transport during peak and off-peak hours using geospatial methods and circular statistics. To that end, we combine two origin-destination matrices: one contains the number of simulated commuting trips and the other contains accurate travel times measured using either Floating Car Data or transit data...

article

An evaluation of section control based on floating car data

Mario Vanlommel, Maarten Houbraken, Pieter Audenaert, Steven Logghe, more

Transportation Research Part C: Emerging Technologies > 2015 > 58 > PC > 617-627

Floating Car Data (FCD) consists of positional information from moving vehicles and is ideally suited to monitor traffic conditions in large road networks. Given a large mobile fleet equipped with the FCD-system, FCD allows to determine actual travel times on road segments/links and determine traffic state. Based on this link-specific information, we analyse the effectiveness of section control, also...

article

Background and foreground interaction: Influence of complementary colors on the search task

Rasha Deeb, Kristien Ooms, Alžbĕta Brychtová, Veerle Van Eetvelde, more

Color Research & Application > 40 > 5 > 437 - 445

Labels are indispensable visual (communication) elements that completely deliver the geospatial message of maps. The objective of this study is to investigate the impact of complementary colors between the map's background and text on the readability of cartographic texts and thus on the efficiency of the map user's search task. This is compared with the use of the “traditional” black labels on the...

article

A commuter-based two-step floating catchment area method for measuring spatial accessibility of daycare centers

Koos Fransen, Tijs Neutens, Philippe De Maeyer, Greet Deruyter, more

Health and Place > 2015 > 32 > Complete > 65-73

This paper puts forward a commuter-based version of the two-step floating catchment area (2SFCA) method, which has gained acceptance in studies on spatial health care accessibility. Current implementations of the 2SFCA method are static in that they consider centroid-based night-time representations of the population. The proposed enhancement to the 2SFCA approach addresses this limitation by accounting...

article

Combining user logging with eye tracking for interactive and dynamic applications

Kristien Ooms, Arzu Coltekin, Philippe De Maeyer, Lien Dupont, more

Behavior Research Methods > 2015 > 47 > 4 > 977-993

User evaluations of interactive and dynamic applications face various challenges related to the active nature of these displays. For example, users can often zoom and pan on digital products, and these interactions cause changes in the extent and/or level of detail of the stimulus. Therefore, in eye tracking studies, when a user’s gaze is at a particular screen position (gaze position) over a period...

article

Contribution of meteorological input in calibrating a distributed hydrologic model in a watershed in the Tianshan Mountains, China

Gonghuan Fang, Jing Yang, Yaning Chen, Changchun Xu, more

Environmental Earth Sciences > 2015 > 74 > 3 > 2413-2424

Water resources are essential to the ecosystem and social economy worldwide, especially in the desert and oasis of the Tarim River Basin, whose water originates largely from the Tianshan Mountains characterized by complicated hydrologic processes and scarce meteorological observations. In this study, distributed hydrologic model of SWAT (Soil and Water Assessment Tool) was applied to the Kaidu River...

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Search results for: Philippe De Maeyer

Future changes of drought characteristics in Coupled Model Intercomparison Project phase 6 Shared Socioeconomic Pathway scenarios over Central Asia

Simulation of site‐scale water fluxes in desert and natural oasis ecosystems of the arid region in Northwest China

Quantitative analysis of the driving factors for groundwater resource changes in arid irrigated areas

The sensitivity of global surface air temperature to vegetation greenness

Spatiotemporal characteristics of future changes in precipitation and temperature in Central Asia

Spatial and temporal characteristics of droughts in Central Asia during 1966–2015

Defining spatiotemporal characteristics of climate change trends from downscaled GCMs ensembles: how climate change reacts in Xinjiang, China

Climate change in the Tianshan and northern Kunlun Mountains based on GCM simulation ensemble with Bayesian model averaging

Information flows as bases for archeology‐specific geodata infrastructures: An exploratory study in flanders

Determining geometric primitives for a 3D GIS easy as 1D, 2D, 3D?

Procedural city model using multi-source parameter estimation

Estimating grondwater nutrients using hyperspectral satellite imagery in the flemish meuse-valley

Spatiotemporal data as the foundation of an archaeological stratigraphy extraction and management system

Identifying public transport gaps using time-dependent accessibility levels

Examining commuting patterns using Floating Car Data and circular statistics: Exploring the use of new methods and visualizations to study travel times

An evaluation of section control based on floating car data

Background and foreground interaction: Influence of complementary colors on the search task

A commuter-based two-step floating catchment area method for measuring spatial accessibility of daycare centers

Combining user logging with eye tracking for interactive and dynamic applications

Contribution of meteorological input in calibrating a distributed hydrologic model in a watershed in the Tianshan Mountains, China

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