Ana Perez Hoyos

Albavalor

Surveillance with anthropometric indicators in young children is a cornerstone of humanitarian and development programs in the Global South. It is fundamental to detect any deterioration in the nutritional status of these vulnerable populations and provides crucial information to monitor progress towards SDG goals, effectiveness of interventions an...

During December 2020, a crowdsourcing campaign to understand what has been driving tropical forest loss during the past decade was undertaken. For 2 weeks, 58 participants from several countries reviewed almost 115 K unique locations in the tropics, identifying drivers of forest loss (derived from the Global Forest Watch map) between 2008 and 2019....

Several global high-resolution built-up surface products have emerged over the last five years, taking full advantage of open sources of satellite data such as Landsat and Sentinel. However, these data sets require validation that is independent of the producers of these products. To fill this gap, we designed a validation sample set of 50 K locati...

Monitoring agricultural land cover is highly relevant for global early warning systems such as ASAP (Anomaly hot Spots of Agricultural Production), because it represents the basis for detecting production deficits in food security assessment. Given the significant inconsistencies among existing land cover datasets, there is a need to obtain a more...

The southern regions of Madagascar have the country’s lowest water supply coverage and are highly vulnerable to drought. Access to potable drinking water is a major challenge for the local population. Chronic droughts lead to annual emergency appeals to save the lives of acute malnourished children. UNICEF’s response consisting in providing potable...

Le Mali dispose d’une variété de systèmes d’information dans le vaste cadre de la sécurité alimentaire et nutritionnelle qui ne sont pas interconnectés. Il en découle une faible analyse des phénomènes d’insécurité alimentaire se résumant généralement à une description d’une situation à un temps donné. Ce rapport est un premier effort pour établir u...

Background One of the reported causes of high malnutrition rates in Burundi and Rwanda is children's inadequate dietary habits. The diet of children may be affected by individual characteristics and by the characteristics of the households and the communities in which they live. We used the minimum dietary diversity of children (MDD-C) indicator as...

Despite the Spanish privileged geographical location and business leadership in the renewable energy field, currently is can be observed that the solar photovoltaic generation, electric self-consumption systems and net-metering policies deployment is much lower than it can be observed in other countries, even with lower energy sources for self-cons...

The current EU 2020 reference framework has set a 20% goal for energy coming from non-exhaustive resources. In general, it can be said that the national action plans for renewable energy sources and the biennial control provided in Directive 2009/28/EC, regarding the promotion of the use of energy from renewable sources, have been adequate in encou...

With the unprecedented availability of satellite data and the rise of global binary maps, the collection of shared reference data sets should be fostered to allow systematic product benchmarking and validation. Authoritative global reference data are generally collected by experts with regional knowledge through photo-interpretation. During the las...

There is an increasing evidence that smallholder farms contribute substantially to food production globally, yet spatially explicit data on agricultural field sizes are currently lacking. Automated field size delineation using remote sensing or the estimation of average farm size at subnational level using census data are two approaches that have b...

One possible contender to replace conventional reverse osmosis schemes is an energy solution where inexhaustible resources work together with a reverse osmosis plant. Based on the experience of an existing wind-powered desalination scheme run for more than 15 years by Soslaires Canarias S.L., the final objective of this paper is to propose improvem...

Monitoring crop and rangeland conditions is highly relevant for early warning and response planning in food insecure areas of the world. Satellite remote sensing can obtain relevant and timely information in such areas where ground data are scattered, non-homogenous, or frequently unavailable. Rainfall estimates provide an outlook of the drivers of...

In the framework of the 2015 financial programming of the Pro-Resilience Action (PRO-ACT) of the Food Security and Sustainable Agriculture thematic instrument, DG DEVCO requested that the JRC contribute to the needs assessment of 35 countries selected for their vulnerability to food insecurity. A subset of 12 countries required more detailed analys...

Accurate and reliable information on the spatial distribution of major crops is needed for detecting possible production deficits with the aim of preventing food security crises and anticipating response planning. In this paper, we compared some of the most widely used global land cover datasets to examine their comparative advantages for cropland...

Resilience thinking can offer a useful perspective from which to tackle persisting and emerging problems in Africa. Resilience is a multifaceted phenomenon which – in very generic terms – describes the ability to thrive despite adversity. Increased resilience can help people, households, communities, countries and global institutions to better anti...

A global reference data set on cropland was collected through a crowdsourcing campaign using the Geo-Wiki crowdsourcing tool. The campaign lasted three weeks, with over 80 participants from around the world reviewing almost 36,000 sample units, focussing on cropland identification. For quality assessment purposes, two additional data sets are provi...

Agriculture monitoring, and in particular food security, requires near real time information on crop growing conditions for early detection of possible production deficits. Anomaly maps and time profiles of remote sensing derived indicators related to crop and vegetation conditions can be accessed online thanks to a rapidly growing number of web ba...

This paper assesses the prevalence of stunting and its potential determinants using data from the Demographic and Health Surveys (DHS) conducted in Rwanda and Burundi in 2010. Selected child, mother, and household characteristics are described for rural and urban areas in each country and the logistic regression model is constructed for each settin...

This report provides a global overview of the food insecurity situation due to different crises and natural disasters, to support the programming of the Pro-resilience Action (PRO-ACT) funding mechanism, a component of the Global Public Goods and Challenges (GPGC) thematic programme of the European Union. The analysis covers the period January 2015...

The accurate representation of terrestrial CO2 uptake (GPP) using Monteith’s approach requires a frequent and site-specific parameterization of the model inputs. In this work, an optimization of this approach has been carried out by adjusting the inputs (fAPAR, PAR and ε) for the study area, peninsular Spain, a typical Mediterranean region. The dai...

Frequency of climatic extremes like long duration droughts has increased in Spain over the last century. The use of remote sensing observations for monitoring and detecting drought is justified on the basis that vegetation vigor is closely related to moisture condition. We derive satellite estimates of bio-physical variables such as fractional vege...

Ecosystem state can be characterized by a set of attributes that are related to the ecosystem functionality, which is a relevant issue in understanding the quality and quantity of ecosystem services and goods, adaptive capacity and resilience to perturbations. This study proposes a major identification of Ecosystem Functional Types (EFTs) in Spa...

There is a wide range of land cover products at global and regional scale. Nevertheless, these products have large thematic and technical discrepancies among them, so an adequate validation in a regional level has not yet un-dertaken. The aim of this work is evaluate the most representative and frequently used land cover datasets in the Iberian Pen...

Monitoring the vegetation activity over long time-scales is necessary to discern ecosystem responses to climate variability. Spatial and temporally consistent estimates of the biophysical variables such as fractional vegetation cover (FVC) and leaf area index (LAI) have been obtained in the context of DULCINEA Project. We use long-term monthly clim...

Various global land cover (LC) datasets have been produced from remote sensing data in response to the need for information about LC. Nevertheless, the potential use of global LC products is often very limited by the lack of detailed accuracy information at regional to national level. This paper proposes a methodology for performing accuracy assess...

There is a wide range of land cover products at global and regional scale. Nevertheless, these products have large thematic and technical discrepancies among them, so an adequate validation in a regional level has not yet undertaken. The aim of this work is evaluate the most representative and frequently used land cover datasets in the Iberian Peni...

One of the major drawbacks of land cover products is the lack of interoperability among them. Since their development was driven by different national or international initiatives, they were developed for different purposes and hold diverse technical characteristics. Thus, comparison among products and quality monitoring is necessary in assessing t...

Vulnerability of natural Spain ecosystems to climate fluctuations Carbon net fluxes of the Spanish forests Interrelation between vegetation and atmosphere at a local scale

The aim of this study is to characterize the vegetation dynamics of the Iberian Peninsula using 16-days MODIS-NDVI time series. For this purpose, NDVI profiles are analyzed using filtered data derived from a spectral technique, a multi-resolution analysis (MRA) based on the wavelet transform (WT). The MRA results in an additive decomposition of the...

The aim of this study is to characterise the vegetation dynamics of the Iberian Peninsula using MODIS-NDVI time series (2000-2008) at 1 km resolution. For this purpose, NDVI profiles are analysed using filtered data derived from a spectral technique, a multi-resolution analysis (MRA) based on the wavelet transform (WT). The MRA results in an addi...

The behaviour and dimensionality of precipitation in the Mediterranean Region determine, in a very significant way, different aspects such as agricultural development, availability of water resources, drought monitoring, etc. Using only this parameter and defining what is known as the Standarized Precipitation Index (SPI), it has been shown that th...

RESUMEN Con la reciente aparición de GLOBCOVER se pretende que se complementen y mejoren las cartografías ya existentes y de uso habitual para la Península Ibérica como GLOBAL land cover (GLC2000) y CORINE Land Cover. Estos productos presentan diferencias básicas a nivel instrumental (satélite utilizado), técnico (algoritmo de clasificación) y conc...

Estimations précises des besoins en chaux dans le Massif Armoricain