Michael Vohland

Michael Vohland
University of Leipzig · Institute for Geography & Remote Sensing Centre for Earth System Research

Prof. Dr.

About

101
Publications
24,530
Reads
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Introduction
Michael Vohland currently works at the Institute for Geography, University of Leipzig. Michael does research in Remote Sensing, Ecosystem and Landscape Analysis and Geoinformatics (GIS).
Additional affiliations
October 2011 - present
Institute for Geography, Faculty of Physics and Earth Sciences, University of Leipzig
Position
  • Head of Department
December 2003 - September 2011
University of Trier
Position
  • Jun.-Prof., apl. Prof., Akademischer Rat

Publications

Publications (101)
Article
As permanent grassland is a large-scale land-use type in Central Europe, grassland inventories are relevant for ecological and agrarian issues. The objective of this study was to assess structural and biochemical grassland parameters (LAI, chlorophyll, water and dry matter contents) from field spectroradiometer data (ASD FieldSpec II) by radiative...
Article
Spectral variable selection is an important step in spectroscopic data analysis, as it tends to parsimonious data representation and can result in multivariate models with greater predictive ability. In this study, we used VIS-NIR (visible to near-infrared) diffuse reflectance and DRIFT (diffuse reflectance infrared fourier transform in the mid-inf...
Article
Environmental monitoring with satellite data is facilitated by frequent observations at a fine spatial scale. As land surface temperature (LST) is one environmental key variable, we implemented a random forest (RF) regression approach to increase the spatial resolution of LST maps from ~1 km, routinely available in daily repetition from the Moderat...
Article
Benefits of fusion approaches for visible to near (vis-NIR) and mid-infrared (MIR) chemometric modelling have been studied to some extent for laboratory-based soil studies, but little is known about the usefulness and limitations for in situ studies. Objectives were to compare laboratory-based and in situ vis-NIR and MIR partial least squares (PLS)...
Article
Full-text available
Anthropogenic climate and land use change is causing rapid shifts in the distribution and composition of habitats with profound impacts on ecosystem biodiversity. The sustainable management of ecosystems requires monitoring programmes capable of detecting shifts in habitat distribution and composition at large spatial scales. Remote sensing observa...
Article
Portable visible to near-infrared (VNIR) and mid-infrared (MIR) soil spectroscopy holds great potential to support field applications in soil science and management by complementing conventional soil analytical methods. Under field conditions, however, soil moisture can critically affect the quality of reflectance measurements. In this study, we ex...
Conference Paper
In physically based catchment modeling, one of the most crucial tasks is to parameterize the soils, where water balance components are highly sensitive to the spatial structure of soil hydraulic properties. To estimate these parameters, Pedo-Transfer functions (PTFs) are applied, which define the functional relationships that transfer available mea...
Article
Full-text available
Remote sensing (RS) enables a cost-effective, extensive, continuous and standardized monitoring of traits and trait variations of geomorphology and its processes, from the local to the continental scale. To implement and better understand RS techniques and the spectral indicators derived from them in the monitoring of geomorphology, this paper pres...
Article
Full-text available
Remote sensing (RS) enables a cost-effective, extensive, continuous and standardized monitoring of traits and trait variations of geomorphology and its processes, from the local to the continental scale. To implement and better understand RS techniques and the spectral indicators derived from them in the monitoring of geomorphology, this paper pres...
Article
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Soil spectroscopy in the visible-to-near infrared (VNIR) and mid-infrared (MIR) is a cost-effective method to determine the soil organic carbon content (SOC) based on predictive spectral models calibrated to analytical-determined SOC reference data. The degree to which uncertainty in reference data and spectral measurements contributes to the estim...
Article
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Comparison of in situ mid-infrared spectroscopy (MIRS) with laboratory MIRS is required to demonstrate the accuracy of field-scale prediction of soil properties. Application of MIRS to investigate soil management questions must also be tested. Our objectives were therefore to determine i) the accuracy of lab vs in situ calibrations using various nu...
Article
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Soil organic matter (SOM) is an indispensable component of terrestrial ecosystems. Soil organic carbon (SOC) dynamics are influenced by a number of well-known abiotic factors such as clay content, soil pH, or pedogenic oxides. These parameters interact with each other and vary in their influence on SOC depending on local conditions. To investigate...
Article
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Comparison of laboratory vs in situ visible/near‐ (visNIR) and mid‐infrared (MIR) spectroscopy for prediction of various soil properties is required to demonstrate trade‐offs between accuracy and efficiency. Field visNIR (ASD FieldSpec 3 Hi‐Res) and MIR (Agilent Technologies 4,300 Handheld FTIR) measurements were made on an arable field in Germany...
Preprint
Full-text available
Soil organic matter (SOM) is an indispensable component of terrestrial ecosystems. Soil organic carbon (SOC) dynamics are influenced by a number of well-known abiotic factors such as clay content, soil pH or pedogenic oxides. These parameters interact with each other and vary in their influence on SOC depending on local conditions. To investigate t...
Article
Improving our understanding of the functions and processes of soil microbial communities and their interactions with the physicochemical soil environment requires large amounts of timely and cost-efficient soil data, which is difficult to obtain with routine laboratory-analytical methods. Soil spectroscopy with portable visible-to-near infrared (VN...
Book
The aim of the Special Issue “Hyperspectral Imaging for Fine to Medium Scale Applications in Environmental Sciences” was to present a selection of innovative studies using hyperspectral imaging (HSI) in different thematic fields. This intention reflects the technical developments in the last three decades, which have brought the capacity of HSI to...
Article
Full-text available
Canopy temperatures are important for understanding tree physiology, ecology, and their cooling potential, which provides a valuable ecosystem service, especially in urban environments. Linkages between tree species composition in forest stands and air temperatures remain challenging to quantify, as the establishment and maintenance of onsite senso...
Article
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The root mean squared error of validation (RMSEV) and ratio of the interquartile range to RMSEV (RPIQV) are key quality parameters in diffuse reflectance infrared (IR) spectroscopy studies, but the effects of different factors on these parameters are often not sufficiently considered. Objectives were to reveal the effects of range of contents, samp...
Article
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The status, changes, and disturbances in geomorphological regimes can be regarded as controlling and regulating factors for biodiversity. Therefore, monitoring geomorphology at local, regional, and global scales is not only necessary to conserve geodiversity, but also to preserve biodiversity, as well as to improve biodiversity conservation and eco...
Article
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The aim of this Special Issue (SI) was to present a selection of innovative applications of HSI in the environmental and earth sciences, with a focus on the fine-to the medium-scale ranging from the microscale to field-and airborne data acquisition and analysis. The SI comprises a total of nine papers in various thematic fields, which can be organi...
Book
Die genaue Bestimmung von Humus-Konzentrationen und deren Veränderungen im Boden ist unter anderem entscheidend für die Bewertung der Bodenqualität und der Rolle der Böden im Klimawandel. In vier verschiedenen Gebieten mit unterschiedlichen Böden wurde an 200 Proben Spektroskopie-Messungen durchgeführt. Die Studie bestätigt die Eignung spektroskopi...
Article
Full-text available
Freshwater lakes provide many important ecosystem functions and services to support biodiversity and human well-being. Proximal and remote sensing methods represent an efficient approach to derive water quality indicators such as optically active substances (OAS). Measurements of above-ground remote and in situ proximal sensors, however, are limite...
Article
The robustness of soil organic carbon (SOC) and total nitrogen (Nt) content prediction accuracy by visible/near (visNIRS) and mid‐infrared (MIRS) spectroscopy models after a change in the quantity or quality of crop residues requires investigation. Arable soils (0‐20 cm) from 20 locations across Germany were collected and 0, 2, 4 or 8 g C kg soil−1...
Article
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Information on habitat preferences is critical for the successful conservation of endangered species. For many species, especially those living in remote areas, we currently lack this information. Time and financial resources to analyze habitat use are limited. We aimed to develop a method to describe habitat preferences based on a combination of b...
Article
Mid-infrared (MIR) spectroscopy has been established as a rapid and cost-efficient laboratory analysis technique for soil organic carbon (SOC) concentrations. Current portable, high-performance handheld MIR instruments have opened the opportunity to take the technique from the laboratory to the field. We tested the potential of handheld MIR spectro...
Article
Soil spectroscopy in the visible-to-near-infrared (vis-NIR) range is a cost-effective alternative analysis technique to determine soil organic carbon (SOC). The development and provision of large-scale soil spectral libraries (SSLs) further facilitates the application of vis-NIR spectroscopy for the rapid assessment of SOC. However, optimal strateg...
Article
Full-text available
In the face of rapid global change it is imperative to preserve geodiversity for the overall conservation of biodiversity. Geodiversity is important for understanding complex biogeochemical and physical processes and is directly and indirectly linked to biodiversity on all scales of ecosystem organization. Despite the great importance of geodiversi...
Article
Different algorithms exist in various software programs for the estimation of soil properties using mid-infrared (MIR) spectroscopy, with recommendations varying between different studies regarding which algorithm should be used. Objectives were to compare the performance of the commercial OPUS Quant 2 software, which uses partial least squares reg...
Article
Full-text available
The phosphorus (P) status of soils depends, among other influencing factors such as soil properties, on P content and availability. These vary with the P distribution among species of different mobility and chemical behavior. The P distribution, in turn, depends on the parent rock material and pedoclimate, and may differ between land uses. This stu...
Article
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Pasture degradation is of increasing global concern as it enforces erosion processes and impacts the carbon storage capacities of the soil. Reliable methods for pasture degradation mapping are thus of great use to provide important information for sustainable landscape planning. Our research focusses on the Guapi-Macacu watershed (Rio de Janeiro (R...
Article
Full-text available
1. Root lignin is a key driver of root decomposition, which in turn is a fundamental component of the terrestrial carbon cycle and increasingly in the focus of ecologists and global climate change research. However, measuring lignin content is labor-intensive and therefore not well-suited to handle the large sample sizes of most ecological studies....
Article
Visible and near infrared spectroscopy (vis‐NIRS) may be useful for an estimation of soil properties in arable fields, but the quality of results are often variable depending on the applied chemometric approach. Partial least squares regression (PLSR) may be replaced by approaches which employ supervised learning methods or variable selection proce...
Article
Full-text available
Mid-infrared (MIR) spectroscopy has received widespread interest as a method to complement traditional soil analysis. Recently available portable MIR spectrometers additionally offer potential for on-site applications, given sufficient spectral data quality. We therefore tested the performance of the Agilent 4300 Handheld FTIR (DRIFT spectra) in co...
Article
Full-text available
We explored the potentials of both non-imaging laboratory and airborne imaging spectroscopy to assess arable soil quality indicators. We focused on microbial biomass-C (MBC) and hot water-extractable C (HWEC), complemented by organic carbon (OC) and nitrogen (N) as well-studied spectrally active parameters. The aggregation of different spectral var...
Article
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Quantifying the accuracy of remote sensing products is a timely endeavor given the rapid increase in Earth observation missions. A validation site for Sentinel-2 products was hence established in central Germany. Automatic multispectral and hyperspectral sensor systems were installed in parallel with an existing eddy covariance flux tower, providin...
Article
Visible and near infrared spectroscopy (vis-NIRS) is an established method for estimating the contents of soil organic carbon (SOC) and soil nitrogen (N). Recent studies have suggested that it may also be useful for estimating enzyme activities, however this potential has not been explored in detail. Objectives were to determine estimation accuraci...
Article
Visual and near-infrared spectroscopy (vis-NIRS) is an established method to estimate soil properties. However, only limited information is available to estimate C and N fractions in a heterogeneous sample. The objectives of our study were to determine estimation accuracies of vis-NIRS using two software for soil organic carbon (SOC), total nitroge...
Article
In soil spectroscopy a series of strategies exist to optimise multivariate calibrations. We explore this issue with a set of topsoil samples for which we estimated soil organic carbon (OC) and total nitrogen (N) from visible–near infrared (vis–NIR) spectra (350–2500 nm). In total, 172 samples were collected to cover the soil heterogeneity in the st...
Article
Estimation accuracies obtained for soil properties from spectroradiometer data markedly depend on the individual sample set. The choice of the statistical method to sample a calibration set and the extension of the multivariate modelling approach with bagging and/or spectral variable selection may optimize predictions. We studied this with a set of...
Article
Full-text available
In soil proximal sensing with visible and near-infrared spectroscopy, the currently available hyperspectral snapshot camera technique allows a rapid image data acquisition in a portable mode. This study describes how readings of a hyperspectral camera in the 450–950 nm region could be utilised for estimating soil parameters, which were soil organic...
Conference Paper
Full-text available
In this paper, a method combining graphical and statistical techniques is proposed for surface resistance calibration in a distributed hydrological model, WaSiM-ETH, by comparing daily evapotranspiration simulated by model WaSiM-ETH with corresponding daily evapotranspiration retrieved from remote sensing images. The study area locates in Nahe catc...
Article
The allocation of non-structural carbohydrates (NSCs) to reserves constitutes an important physiological mechanism associated with tree growth and survival. However, procedures for measuring NSC in plant tissue are expensive and time-consuming. Near-infrared spectroscopy (NIRS) is a high-throughput technology that has the potential to infer the con...
Conference Paper
Full-text available
Parameter sensitivity indicates the rate of change in model outputs with respect to the change in specific parameters. It is helpful in identifying the parameters that a model is the most sensitive to. By focusing on these significant parameters, we can simplify and accelerate future studies (e.g. model calibration and validation). In this paper, p...
Article
Field reflectance spectroscopy has been widely used in proximal soil sensing. Results of spectroscopic approaches depend, inter alia, from the experimental setup and the applied spectroradiometric instrumentation. Beyond the traditional instrument concepts (acquisition of ground truth data with field spectroradiometers, air- and space-borne scanner...
Conference Paper
Full-text available
The spectral assessment of soil properties is handicapped by the fact that spectral predictive mechanisms often vary from one population to another. In a landscape approach, heterogeneous conditions with a wide variety of combinations of spectrally active factors have to be considered. Heterogeneity, however, is one main reason for poor predictions...
Conference Paper
Full-text available
For no-rainfall conditions in a forest region, actual evapotranspiration (ET) comes from transpiration from plant leaves and evaporation of bare soil between the plants. In this paper, the WaSiM-ETH hydrological model was used for simulation of plot scale water balance in the Nahe catchment (Rhineland-Palatinate/Germany). The model is physically ba...
Conference Paper
Full-text available
Die Anwendungsmöglichkeiten der VIS-NIR Feldspektroskopie in der spektralen Bodendetektion sind bereits durch zahlreiche existierende Studien aufgezeigt worden. Die jeweils erzielten Ergebnisse (z.B. Schätzgenauigkeiten für verschiedene Boden-konstituenten) sind unter anderem vom eingesetzten Spektrometer und der gewählten Messkonfiguration abhängi...
Conference Paper
Full-text available
Für diese Studie wurde ein ca. 32.000 km² großes Testgebiet im östlichen Mittelmeerraum ausgewählt, dass sich durch wechselhafte Verhältnisse hinsichtlich Topographie und Landnutzung auszeichnet. Untersucht wurde, mit welcher Genauigkeit aus MODIS-Tagesprodukten der Landoberflächentemperatur LST (mit nomineller Sensorauflösung von ~1 km) räumlich b...
Chapter
Full-text available
Remote sensing has been widely used for farming applications. Historically satellites dominate this technique. Terrestrial platforms can carry spectral sensors as well enabling real-time estimations for crop yield, pest and disease occurrence and much more. Field spectroscopy is a technique that can provide biochemical measurements without wet chem...
Article
The prediction accuracy of visible and near-infrared (Vis-NIR) spectroscopy for soil chemical and biological parameters has been variable and the reasons for this are not completely understood. Objectives were (1) to explore the predictability of a series of chemical and biological properties for three different soil populations and—based on these...
Article
Several algorithms exist for the calibration procedures of near-infrared spectra in soil-scientific studies, but the potential of a genetic algorithm (GA) for spectral feature selection and interpretation has not yet been sufficiently explored. Objectives were (1) to test the usefulness of near-infrared spectroscopy (NIRS) for a prediction of C and...
Article
A successful determination of spectrally active soil components with visible and near infrared reflectance spectroscopy (VIS-NIRS, 400–2500nm) depends on the selection of an adequate multivariate calibration technique. In this study, the contents of thermolabile organic carbon (C375°C), the inert organic C fraction (Cinert) and the sum of both (tot...
Article
The site for this study - located in Rhineland-Palatinate, Germany ("Bitburger Gutland") - covered different geological substrates and agro-pedological zones. In total, 42 plots were sampled in the field; soil samples from the top horizon were analysed in the laboratory for total organic carbon (OC), hot water-extractable C (HWE-C) and microbial C...