Felix Rembold

Felix Rembold
European Commission | ec · Joint Research Centre (JRC)

Dr.

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74
Publications
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2,376
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Publications

Publications (74)
Technical Report
A brief example of monitoring forest areas in Cote d'Ivoire
Article
Full-text available
Forecasting crop yields is important for food security, in particular to predict where crop production is likely to drop. Climate records and remotely-sensed data have become instrumental sources of data for crop yield forecasting systems. Similarly, machine learning methods are increasingly used to process big Earth observation data. However, acce...
Article
Full-text available
The increasing frequency and severity of extreme climatic events and their impacts are being realized in many regions of the world, particularly in smallholder crop and livestock production systems in Sub-Saharan Africa (SSA). These events underscore the need for timely early warning. Satellite Earth Observation (EO) availability, rapid development...
Preprint
Full-text available
Forecasting crop yields is important for food security, in particular to predict where crop production is likely to drop. Climate records and remotely-sensed data have become instrumental sources of data for crop yield forecasting systems. Similarly, machine learning methods are increasingly used to process big Earth observation data. However, acce...
Article
Full-text available
The frequent acquisitions of fine spatial resolution imagery (10 m) offered by recent multispectral satellite missions, including Sentinel-2, can resolve single agricultural fields and thus provide crop-specific phenology metrics, a crucial information for crop monitoring. However, effective phenology retrieval may still be hampered by significant...
Article
Full-text available
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...
Conference Paper
Full-text available
Detailed and up to date information on large scale land acquisitions (LSLA) in developing countries is generally not easily available due to low transparency of such deals, remoteness of the areas concerned and conflicts about tenure rights. Out of all deals documented in the Land Matrix 1 platform for example, only 13% are linked to a georeference...
Article
Full-text available
For food crises early warning purposes, coarse spatial resolution NDVI data are widely used to monitor vegetation conditions in near real-time (NRT). Different types of NDVI anomalies are typically employed to assess the current state of crops and rangelands as compared to previous years. Timeliness and accuracy of such anomalies are critical facto...
Article
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The immediate surroundings of refugee camps in drylands are among the areas exposed to highest pressure on natural resources including vegetation and soil. Understanding the dynamics of land fencing in these areas is critical for sustainable camp management and can help to improve the knowledge about land management in drylands in general. Very hig...
Article
Full-text available
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...
Article
Global and regional scale agricultural monitoring systems aim to provide up-to-date information regarding food production to different actors and decision makers in support of global and national food security. To help reduce price volatility of the kind experienced between 2007 and 2011, a global system of agricultural monitoring systems is needed...
Chapter
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People, planet, prosperity and peace are four priorities shared by Africa and Europe, and areas where opportunities for beneficial cooperation abound. Over the past three decades, the European Commission’s Joint Research Centre (JRC) has worked with many organisations and institutions across Africa. This report and its accompanying interactive onli...
Article
Full-text available
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...
Chapter
Full-text available
People, planet, prosperity and peace are four priorities shared by Africa and Europe, and areas where opportunities for beneficial cooperation abound. Over the past three decades, the European Commission’s Joint Research Centre (JRC) has worked with many organisations and institutions across Africa. This report and its accompanying interactive onli...
Technical Report
Full-text available
Between 2005 and 2016, the Ethiopian Government leased about 2.4 million hectares of land for commercial agricultural investments to private domestic and foreign investors as a means of economic growth, food security and job creation. In order to steer these vast amounts of large-scale agricultural investments towards the envisaged benefits, it is...
Article
Full-text available
Restoration interventions to combat land degradation are carried out in arid and semi-arid areas to improve vegetation cover and land productivity. Evaluating the success of an intervention over time is challenging due to various constraints (e.g. difficult-to-access areas, lack of long-term records) and the lack of standardised and affordable meth...
Article
Full-text available
We analysed the performance and timeliness of the Standardized Precipitation Index (SPI) in anticipating deviations from mean seasonal vegetation productivity in the Sahel. Gridded rainfall estimates are used to compute the SPI for 1–6-month timescales, whereas the Z-score of the cumulative value of the Fraction of Absorbed Photosynthetically Activ...
Article
Prosopis spp. is a fast and aggressive invader threatening many arid and semi-arid areas globally. The species is native to the American dry zones and was introduced in Somaliland for dune stabilization and fuel wood production in the 1970’s and 1980’s. Its deep rooting system is capable of tapping into the groundwater table thereby reducing its re...
Conference Paper
Full-text available
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...
Conference Paper
Restoration interventions to combat desertification and land degradation are carried out in arid and semi-arid areas to improve vegetation cover and land productivity. Evaluating the success of an intervention is challenging due various data constrains and the lack of standardized and affordable methodologies. We propose a semi-automatic methodolog...
Article
Full-text available
Prosopis juliflora is a drought-tolerant fast-growing tree species originating from South and Central America with a high invasion potential in arid and semi-arid areas in Africa. It was introduced in Somaliland in the 1980s, and is reported to have spread vigorously since. Despite being recognised as a serious issue in the country, the actual scal...
Poster
Full-text available
Prosopis spp. native to the American dry zones are a fast and aggressive invaders threatening many arid and semi-arid areas globally. The species was introduced in Somaliland for dune stabilization and providing fuelwood in the 1970s and 1980s, as its deep rooting system is capable of tapping into the ground water table rendering it less reliant on...
Technical Report
Full-text available
Land degradation and desertification represent a major threat to the population and ecosystems of (semi)-arid regions like the Sahel and the Sahara. In 2007, the African Union launched a pan-African programme, the Great Green Wall for the Sahara and the Sahel Initiative (GGWSSI) to reverse land degradation and desertification in the region, improve...
Conference Paper
Full-text available
Prosopis juliflora is a fast growing tree species originating from South and Central America with a high invasion potential in semi-arid areas around the globe. It was introduced to East Africa for the stabilization of dune systems and for providing fuel wood after prolonged droughts and deforestation in the 1970s and 1980s. In many dry lands in Ea...
Article
Full-text available
Monitoring crop and natural vegetation conditions is highly relevant, particularly in the food insecure areas of the world. Data from remote sensing image time series at high temporal and medium to low spatial resolution can assist this monitoring as they provide key information about vegetation status in near real-time over large areas. The Softwa...
Poster
Full-text available
Keywords: Remote sensing, Prosopis, invasive species, Somaliland Prosopis is an invasive tree species which has globally colonized many arid and semi-arid environments. It was introduced to East Africa for the stabilization of dune systems and for providing fuel wood after prolonged droughts in the 1970’s. In many dry lands in East Africa the speci...
Conference Paper
Full-text available
Livestock plays a central economic role in Niger, but it is highly vulnerable due to the high inter-annual variability of rain and hence pasture production. This study aims to develop an approach for mapping pasture biomass production to support activities of the Niger Ministry of Livestock for effective pasture management. Our approach utilises th...
Article
Full-text available
Following more than 20 years of civil unrest, environmental information for southern Somalia is scarce. Wood charcoal production and export is a major activity supporting war regimes in this area such as the extreme Islamist group Al-Shabaab. However, little quantitative information exists on the extent of this charcoal production. In this study, w...
Article
Full-text available
In the Sahel region, moderate to coarse spatial resolution remote sensing time series are used in early warning monitoring systems with the aim of detecting unfavorable crop and pasture conditions and informing stakeholders about impending food security risks. Despite growing evidence that vegetation productivity is directly related to phenology, m...
Article
Droughts induce livestock losses that severely affect Kenyan pastoralists. Recent index insurance schemes have the potential of being a viable tool for insuring pastoralists against drought-related risk. Such schemes require as input a forage scarcity (or drought) index that can be reliably updated in near real-time, and that strongly relates to li...
Article
Full-text available
Monitoring vegetation conditions is a critical activity for assessing food security in the Horn of Africa. Remote sensing from space offers a unique opportunity to obtain consistent and timely information over large and often inaccessible areas where field observations are scattered, non-homogenous, or frequently unavailable. In this study we outli...
Article
Full-text available
Given strong year-to-year variability, increasing competition for natural resources, and climate change impacts on agriculture, monitoring global crop and natural vegetation conditions is highly relevant, particularly in food insecure areas. Data from remote sensing image series at high temporal and low spatial resolution can help to assist in this...
Article
Early warning monitoring systems in food-insecure countries aim to detect unfavourable crop and pasture conditions as early as possible during the growing season. This manuscript describes a procedure to estimate the probability of experiencing an end-of-season biomass production deficit during the on-going season based on a statistical analysis of...
Technical Report
Full-text available
APHLIS provides estimates of the postharvest weight losses (PHLs) of cereal grains for Sub-Saharan Africa. These loss estimates support - agricultural policy formulation, identification of opportunities to improve value chains, improvement in food security (by improving the accuracy of cereal supply estimates), and monitoring of loss reduction acti...
Conference Paper
Full-text available
Following more than 20 years of civil unrest, environmental information for Southern Somalia is scarce while there is clear evidence that the war economy fuelled by the conflict is rapidly depleting the country’s natural resources and especially the woody biomass. Wood charcoal production is one of the most relevant businesses supporting war regime...
Article
Full-text available
Due to an oversight by the authors, in the upper graph in Figure 4 [1] only the determination coefficients for Morocco are correct. Those for the other three countries are wrong.
Article
Full-text available
Following more than 20 years of civil unrest, environmental information for Southern Somalia is scarce while there is clear evidence that the war economy fuelled by the conflict is rapidly depleting the country's natural resources and especially the woody biomass. Wood charcoal production is one of the most relevant businesses supporting war regime...
Conference Paper
Monitoring the impact of drought on vegetation conditions is a critical activity for assessing food security in semi-arid and arid countries in Africa. Remote sensing from space offers a unique opportunity to obtain consistent and timely information over large and inaccessible areas where field observations are scattered, inhomogeneous or frequentl...
Article
Full-text available
Low resolution satellite imagery has been extensively used for crop monitoring and yield forecasting for over 30 years and plays an important role in a growing number of operational systems. The combination of their high temporal frequency with their extended geographical coverage generally associated with low costs per area unit makes these images...
Article
Full-text available
For large areas, it is difficult to assess the spatial distribution and inter-annual variation of crop acreages through field surveys. Such information, however, is of great value for governments, land managers, planning authorities, commodity traders and environmental scientists. Time series of coarse resolution imagery offer the advantage of glob...
Article
Full-text available
Time series of coarse resolution imagery offer the advantage of free global coverage but have to deal with mixed pixels. The study uses neural nets as modelling tool for sub-pixel crop acreage estimation. Nets are trained with reference crop acreage information derived from 30 m Landsat images and CORINE LC map for interpreting changes in the shape...
Technical Report
Full-text available
This report explains the construction and operation of APHLIS (The African Postharvest Losses Information System), a recent development in PHL estimation that provides the countries of East and Southern Africa with cereal PHL figures. These are estimated by crop, by country and by province and take into account scale of farming, climate type, numbe...
Article
Multi-temporal very high resolution satellite images and field work have been used for quantifying the tree cutting rate over a 5 years period in a very arid tiger bush area of North Eastern Somalia with intensive charcoal production activities. By applying both a classical area frame sampling approach with visual interpretation of the samples and...
Article
Full-text available
Rainfall estimates derived from satellite imagery and global circulation models are frequently used for vegetation monitoring in many areas of Africa because of the shortage of observed rainfall data and the sparse network of meteorological stations. At the same time, this scarce density of rain gauge stations makes the calibration and validation o...
Article
Full-text available
Drought is one of the most frequent climate-related disasters occurring across large portions of the African continent, often with devastating consequences for the food security of agricultural households. This study proposes a novel method for calculating the empirical probability of having a significant proportion of the total agricultural area a...
Article
Full-text available
Soaring food prices during 2007/2008, and the realisation that sporadic food shortages are likely to continue long into the future, has reawakened interest in the benefits of reducing food losses. As a means of making more accurate estimates of how much food is lost, the Joint Research Centre (European Commission) proposed the development of the Af...
Article
Full-text available
Since 2001, the MARS Unit of the Joint Research Centre of the European Commission has developed a system for crop monitoring and forecasting in food insecure regions. This communication first provides an overall description of the system and then focuses on one monthly bulletin prepared and published by FOOD-SEC action of the MARS Unit in East Afri...
Article
Full-text available
Achieving food security in particular in Africa continues to pose a major challenge to humankind. It is clear that the future agricultural potential of Africa plays a critical role in meeting this challenge. Although crop yield can be estimated with a degree of reliability using a limited sample of ground observations, the exact crop acreage and th...
Conference Paper
The importance of crop monitoring activities has dramatically increased over the last years, in particular following the 2007-2008 food price crises. A global perspective and data infrastructure is required to address highly differentiated agricultural realities ranging from food insecure/drought-prone areas to emerging countries and key commodity...