Xavier Pons
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View article: LidarTeam: a remote sensing driven method for massive lidar data to regional DHM refined through user feedback
LidarTeam: a remote sensing driven method for massive lidar data to regional DHM refined through user feedback Open
This paper presents a method to obtain Digital Height Models from massive airborne lidar data processing (billions of points) over tens of thousands of km2, along with a new Geospatial User Feedback (GUF) geoservice. The method avoids larg…
View article: A near real-time spatial decision support system for improving sugarcane monitoring through a satellite mapping web browser
A near real-time spatial decision support system for improving sugarcane monitoring through a satellite mapping web browser Open
The global importance of sustainable sugarcane as a source of food and energy has driven the development of decision-making tools based on remote sensing (RS) to improve crop management. An approach in agricultural lands is the implementat…
View article: Landsat Collection 2: Key Information and recommendations for data users and product developers
Landsat Collection 2: Key Information and recommendations for data users and product developers Open
The United States Geological Survey (USGS) effort to provide coherent data for the Landsat series from various perspectives (e.g., geometric, radiometric, or metadata) is, without a doubt, admirable, especially considering the vast volume …
View article: A Comparison of Different Solar Radiation Models in the Iberian Peninsula
A Comparison of Different Solar Radiation Models in the Iberian Peninsula Open
Solar radiation is a first-order essential climate variable like temperature and precipitation. Its significant spatiotemporal variability, mainly due to atmospheric conditions, makes modelling particularly challenging, especially in regio…
View article: Diagnosis for integrating the main Iberian networks of solar radiation meteorological stations
Diagnosis for integrating the main Iberian networks of solar radiation meteorological stations Open
This work carries out a diagnosis of the data from the two main networks of solar radiation stations in the Iberian Peninsula: the Agencia Estatal de Meteorología (AEMET, Spain, with daily data 1980–2020), and the Sistema Nacional de Infor…
View article: Trends in snow persistence at the Central Pyrenees derived from 40 years of Landsat satellite images
Trends in snow persistence at the Central Pyrenees derived from 40 years of Landsat satellite images Open
An accurate quantification of the spatiotemporal dynamics of seasonal snow is essential for understanding and predicting the impacts of climate change on mountain regions and their feedback on global climate. This is especially critical in…
View article: Spatiotemporal Variations in Biophysical Water Quality Parameters: An Integrated In Situ and Remote Sensing Analysis of an Urban Lake in Chile
Spatiotemporal Variations in Biophysical Water Quality Parameters: An Integrated In Situ and Remote Sensing Analysis of an Urban Lake in Chile Open
This study aims to develop and implement a methodology for retrieving bio-optical parameters in a lagoon located in the Biobío region, South-Central Chile, by analyzing time series of Landsat-8 OLI satellite images. The bio-optical paramet…
View article: Spatiotemporal Variations in Biophysical Water Quality Parameters: An Integrated In-Situ and Remote Sensing Analysis for an Urban Lake in Chile
Spatiotemporal Variations in Biophysical Water Quality Parameters: An Integrated In-Situ and Remote Sensing Analysis for an Urban Lake in Chile Open
This study aims to develop and implement a methodology for retrieving bio-optical parameters in a lagoon located in the Biobío region, in south-central Chile by analyzing time series of Landsat-8 satellite images, specifically using…
View article: An environmental monitoring and control system for the ATLAS ITk Outer Barrel quality control and integration
An environmental monitoring and control system for the ATLAS ITk Outer Barrel quality control and integration Open
This paper describes the development of a system based on Programmable Logic Controllers (PLC) for safety interlocking and environmental monitoring during ATLAS ITk Outer Barrel (OB) loaded local support quality control (QC) and later inte…
View article: Phenological sensitivity and seasonal variability explain climate-driven trends in Mediterranean butterflies
Phenological sensitivity and seasonal variability explain climate-driven trends in Mediterranean butterflies Open
Although climate-driven phenological shifts have been documented for many taxa across the globe, we still lack knowledge of the consequences they have on populations. Here, we used a comprehensive database comprising 553 populations of 51 …
View article: ‘Warring factions and community disputes’: Aboriginal Politics in Carpentaria
‘Warring factions and community disputes’: Aboriginal Politics in Carpentaria Open
Alexis Wright’s Carpentaria is a political novel in the sense that it addresses Aboriginal dispossession in the Gulf region. It describes quite graphically the violence the white colonists used to establish control over the land and its in…
View article: Driving Forces of Forest Expansion Dynamics across the Iberian Peninsula (1987–2017): A Spatio-Temporal Transect
Driving Forces of Forest Expansion Dynamics across the Iberian Peninsula (1987–2017): A Spatio-Temporal Transect Open
This study analyzes the spatio-temporal dynamics of the drivers of forest expansion in the Iberian Peninsula for the periods 1987–2002–2017 through a 185 km-wide north–south Landsat scene transect. The analysis has considered a variety of …
View article: Re-conceptualising education policy trajectories in a globalised world: lessons from a multi-level comparison of accountability in France and Quebec
Re-conceptualising education policy trajectories in a globalised world: lessons from a multi-level comparison of accountability in France and Quebec Open
This article aims to show the value of the concept of policy trajectory to compare, from a long-term perspective, the transformations of education policies in the context of globalisation. After discussing the scope and limitations of the …
View article: An Operational Radiometric Correction Technique for Shadow Reduction in Multispectral UAV Imagery
An Operational Radiometric Correction Technique for Shadow Reduction in Multispectral UAV Imagery Open
This study focuses on the recovery of information from shadowed pixels in RGB or multispectral imagery sensed from unmanned aerial vehicles (UAVs). The proposed technique is based on the concept that a property characterizing a given surfa…
View article: The Role of Recent (1985–2014) Patterns of Land Abandonment and Environmental Factors in the Establishment and Growth of Secondary Forests in the Iberian Peninsula
The Role of Recent (1985–2014) Patterns of Land Abandonment and Environmental Factors in the Establishment and Growth of Secondary Forests in the Iberian Peninsula Open
Farmland abandonment has been a widespread land-use change in the Iberian Peninsula since the second half of the 20th century, leading to the establishment of secondary forests across the region. In this study, we aimed to address changes …
View article: Fusing Landsat and SAR Data for Mapping Tropical Deforestation through Machine Learning Classification and the PVts-<b>β</b> Non-Seasonal Detection Approach
Fusing Landsat and SAR Data for Mapping Tropical Deforestation through Machine Learning Classification and the PVts-<b>β</b> Non-Seasonal Detection Approach Open
This article focuses on mapping tropical deforestation using time series and machine learning algorithms. Before detecting changes in the time series, we reduced seasonality using Photosynthetic Vegetation (PV) index fractions obtained fro…
View article: A Framework of Filtering Rules over Ground Truth Samples to Achieve Higher Accuracy in Land Cover Maps
A Framework of Filtering Rules over Ground Truth Samples to Achieve Higher Accuracy in Land Cover Maps Open
Remote Sensing (RS) digital classification techniques require sufficient, accurate and ubiquitously distributed ground truth (GT) samples. GT is usually considered “true” per se; however, human errors, or differences in criteria when defin…
View article: Geospatial User Feedback: How to Raise Users’ Voices and Collectively Build Knowledge at the Same Time
Geospatial User Feedback: How to Raise Users’ Voices and Collectively Build Knowledge at the Same Time Open
Geospatial data is used not only to contemplate reality but also, in combination with analytical tools, to generate new information that requires interpretation. In this process data users gain knowledge about the data and its limitations …
View article: Geospatial Queries on Data Collection Using a Common Provenance Model
Geospatial Queries on Data Collection Using a Common Provenance Model Open
Lineage information is the part of the metadata that describes “what”, “when”, “who”, “how”, and “where” geospatial data were generated. If it is well-presented and queryable, lineage becomes very useful information for inferring data qual…
View article: Impacts of Use and Abuse of Nature in Catalonia with Proposals for Sustainable Management
Impacts of Use and Abuse of Nature in Catalonia with Proposals for Sustainable Management Open
This paper provides an overview of the last 40 years of use, and in many cases abuse, of the natural resources in Catalonia, a country that is representative of European countries in general, and especially those in the Mediterranean regio…
View article: Uso de Sentinel-2 y datos auxiliares para la generación, mediante clasificación de imágenes, del Mapa de Usos y Cubiertas del Suelo de Cataluña 2017
Uso de Sentinel-2 y datos auxiliares para la generación, mediante clasificación de imágenes, del Mapa de Usos y Cubiertas del Suelo de Cataluña 2017 Open
This paper details the process of generating the 2017 Land Use/Land Cover Map of Catalonia (MUCSC) using automatic classification of satellite imagery and auxiliary cartographic and remote sensing data. A total of 60 images (6 dates for ea…
View article: Unmanned aerial system protocol for quarry restoration and mineral extraction monitoring
Unmanned aerial system protocol for quarry restoration and mineral extraction monitoring Open
Mining is an important activity of the primary sector with strong economic and environmental impacts. All over the world, governments have made efforts to regulate mine restoration by monitoring and assessing the evolution of mined sites. …
View article: Protected Areas from Space Map Browser with Fast Visualization and Analytical Operations on the Fly. Characterizing Statistical Uncertainties and Balancing Them with Visual Perception
Protected Areas from Space Map Browser with Fast Visualization and Analytical Operations on the Fly. Characterizing Statistical Uncertainties and Balancing Them with Visual Perception Open
Despite huge progress in applying Earth Observation (EO) satellite data to protected areas, managers still lack the right tools or skills to analyze the data and extract the necessary knowledge. In this paper a set of EO products are organ…
View article: Managing the knowledge created by the users trough Geospatial User Feedback system. The NEXTGEOSS use case
Managing the knowledge created by the users trough Geospatial User Feedback system. The NEXTGEOSS use case Open
<p>First approach to metadata was based on producer's point of view, since producers were responsible for documenting and sharing metadata about their products. Since 2012 (started in EU FP7 GeoViQua project), the Geospatial User Fee…
View article: UAS Remote Sensing Products for Supporting Extraction Management and Restoration Monitoring in Open-Pit Mines
UAS Remote Sensing Products for Supporting Extraction Management and Restoration Monitoring in Open-Pit Mines Open
Accurate mapping of open-pit mine areas is a prerequisite for the efficient resource management of extractive companies, but also detailed mapping is a requirement for public administrations, especially regarding the monitoring of restored…
View article: A Portal Offering Standard Visualization and Analysis on top of an Open Data Cube for Sub-National Regions: The Catalan Data Cube Example
A Portal Offering Standard Visualization and Analysis on top of an Open Data Cube for Sub-National Regions: The Catalan Data Cube Example Open
The amount of data that Sentinel fleet is generating over a territory such as Catalonia makes it virtually impossible to manually download and organize as files. The Open Data Cube (ODC) offers a solution for storing big data products in a…
View article: A provenance metadata model integrating ISO geospatial lineage and the OGC WPS: Conceptual model and implementation
A provenance metadata model integrating ISO geospatial lineage and the OGC WPS: Conceptual model and implementation Open
Nowadays, there are still some gaps in the description of provenance metadata. These gaps prevent the capture of comprehensive provenance, useful for reuse and reproducibility. In addition, the lack of automated tools for capturing provena…
View article: Regime shifts of Mediterranean forest carbon uptake and reduced resilience driven by multidecadal ocean surface temperatures
Regime shifts of Mediterranean forest carbon uptake and reduced resilience driven by multidecadal ocean surface temperatures Open
The mechanisms translating global circulation changes into rapid abrupt shifts in forest carbon capture in semi‐arid biomes remain poorly understood. Here, we report unprecedented multidecadal shifts in forest carbon uptake in semi‐arid Me…
View article: Spatial and spectral pattern identification for the automatic selection of high-quality MODIS images
Spatial and spectral pattern identification for the automatic selection of high-quality MODIS images Open
Remote sensing is providing an increasing number of crucial data about Earth. Systematic revisitation time allows the analysis of long time series as well as imagery utilization in the most interesting moments. Nevertheless, the current hu…