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Determining the foliar N: P ratio provides a tool for understanding nutrient limitation on plant production and consequently for the feeding patterns of herbivores. In order to understand the nutrient limitation at landscape scale, remote sensing techniques offer that opportunity. The objective of this study is to investigate the utility of in situ(More)
Many bio-geochemical processes in terrestrial ecosystems are related to foliar biochemicals in leaves and needles, specifically to leaf pigmentation and leaf nitrogen concentrations (Melillo et al. Developing methods to quantify pigment content by remote sensing could advance the understanding of photosynthetic processes and allow detection and monitoring(More)
Comparative analysis of different retrieval methods for mapping grassland leaf area index using airborne imaging spectroscopy. Int. Article history: Available online xxx Keywords: Leaf area index Radiative transfer model Look-up table Narrow band vegetation index Predictive equation Sample size a b s t r a c t Fine scale maps of vegetation biophysical(More)
Keywords: Crop grow modelling Data assimilation Particle filter APSIM Remote sensing RapidEye Maize a b s t r a c t Complex crop growth models (CGM) require a large number of input parameters, which can cause large errors if they are uncertain. Furthermore, they often lack spatial information. The coupling of a CGM with a radiative transfer model offers the(More)
Our planned research activities for 2005 are embedded in ongoing activities concerning advanced forest inventory strategies with remotely sensed data which are conducted in cooperation between the Remote Sensing Department and the Ministry of Environment and Forestry of the federal state of the Rhineland-Palatinate. The scope of these activities is the(More)
Genetic variation between various plant species determines differences in their physio-chemical makeup and ultimately in their hyperspectral emissivity signatures. The hyperspectral emissivity signatures, on the one hand, account for the subtle physio-chemical changes in the vegetation, but on the other hand, highlight the problem of high dimensionality.(More)
Biogas production from energy crops by anaerobic digestion is becoming increasingly important. The amount of biogas that can be produced per unit of biomass is referred to as the biomethane potential (BMP). For energy crops, the BMP varies among varieties and with crop state during the vegetation period. Traditional ways of analytical BMP determination are(More)