Matthias Dees

Matthias Dees
University of Freiburg | Albert-Ludwigs-Universität Freiburg

Professor

About

88
Publications
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658
Citations

Publications

Publications (88)
Article
Full-text available
The forestry sector of Serbia, other users, as well as international organizations and conventions express the need for an increasing volume, specific structure and high reliability of information on the growing stock of Serbia. To meet these requirements, NFI-2 has undergone significant changes compared to NFI-1. In methodological terms, the chang...
Article
Full-text available
Airborne laser scanning (ALS) is generally known as the most accurate and primary source providing the 3D structure of forest canopy model (CHM) information; however, in many countries, it is not updated as needed for continuous forest management planning due to its high costs. Image-based point clouds derived from airborne stereo aerial photograph...
Article
Full-text available
Research Highlights: A transparent approach to developing a forest reference emissions level (FREL) adjusted to future local developments in Southern Cameroon is demonstrated. Background and Objectives: Countries with low historical deforestation can adjust their forest reference (emission) level (FREL/FRL) upwards for REDD+ to account for likely f...
Article
Spatially explicit information on tree species composition of any forest provides valuable information to forest managers as well as to nature conservationists. In this study, the potential of three spaceborne sensors: (1) Landsat-8, (2) Sentinel-2, and (3) IRS-Pansharpened were compared by applying Random Forest (RF) classification algorithms to c...
Article
Full-text available
Digital stereo aerial photographs are periodically updated in many countries and offer a viable option for the regular update of information on forest variables. We compared the potential of image-based point clouds derived from three different sets of aerial photographs with airborne laser scanning (ALS) to assess plot-level forest attributes in a...
Article
Full-text available
Background European forests are considered a crucial resource for supplying biomass to a growing bio-economy in Europe. This study aimed to assess the potential availability of forest biomass from European forests and its spatial distribution. We tried to answer the questions (i) how is the potential forest biomass availability spatially distribute...
Conference Paper
Full-text available
EXTENDED ABSTRACT Introduction The snow cover variations are likely to have inevitable impacts on mountain hydrological function and its components including vegetation, wildlife, and people who depend on this ecosystem. However, mountain summit which is covered by snow cover is recognized as a tangible region on earth especially it responses quic...
Article
Land-cover mapping (LCM) at a fine scale would be useful for forest management across heterogeneous natural landscapes. However, the heterogeneity of land covers at such scales results in complex spectral and textural properties that hinder the applicability of LCM. Besides, the method suffers from, e.g. inconsistent representation of different lan...
Conference Paper
Full-text available
Determining NDVI data continuity of Sentinel-2A MSI and Landsat 8 OLI with three or five days visiting time have a significant contribution in long-term time series of forest monitoring [1]. Current study tried to examine the NDVI data continuity between Sentinel-2A and Landsat 8 OLI at the maximum growing season in the Çamliyayla forest district,...
Article
Sustainably managed forests provide renewable raw material that can be used for primary/secondary conversion products and as biomass for energy generation. The potentially available amounts of timber, which are still lower than annual increments, have been published earlier. Access to this timber can be challenging for small-dimensioned assortments...
Chapter
Lignocellulosic biomass from forests and forest industries represents a crucial resource for the bioeconomy. Many assessments have been carried out over the last decade to quantify biomass potentials from forests and forest industries. The results from these assessments are quite diverse because of varying definitions and assumptions. Here we repor...
Chapter
Full-text available
Since early 2000, several biomass assessment studies were delivered. Most of them were driven by the increasing demand of both policy and industrial actors in the bioenergy and biofuels sectors. As such, the key assumptions used to estimate the available biomass quantities and the respective units in which they have been expressed are strongly rela...
Article
Full-text available
Information pertaining to forest timber volume is crucial for sustainable forest management. Remotely-sensed data have been incorporated into operational forest inventories to serve the need for ever more diverse and detailed forest statistics and to produce spatially explicit data products. In this study, data derived from airborne laser scanning...
Article
Full-text available
Purpose of Review: This paper presents a review of the current state of the art in remote sensing-based monitoring of forest disturbances and forest degradation from optical Earth Observation data. Part one comprises an overview and tabular description of currently available optical remote sensing sensors, which can be used for forest disturbance a...
Article
Full-text available
Accurate and updated knowledge of forest tree heights is fundamental in the context of forest management. However, measuring canopy height over large forest areas using traditional inventory techniques is laborious, timeconsuming and excessively expensive. In this study, image-based point clouds produced from stereo aerial photographs (AP) were use...
Article
Full-text available
Satellite images of various spatial resolutions and different image classification techniques have been utilized for land cover (LC) mapping at local and regional scale studies.Mapping capabilities and achievable accuracies of LC classification in a mountain environment are, however, influenced by the spatial resolution of the utilized images and a...
Poster
Full-text available
The use of remote sensing for the quantification of forest resources, viz. above ground biomass and growing stock volume has been a topic of research as well as has been in practice for monitoring to support decision making. There have been continuous efforts to apply improved methodologies and tools to ever improving remote sensing datasets in ord...
Article
Anthropogenic activities and natural processes are continuously altering the mountainous environment through deforestation, forest degradation and other land-use changes. It is highly important to assess, monitor and forecast forest cover and other land-use changes for the protection and conservation of mountainous environment. The present study de...
Article
Full-text available
The growth characteristics of silver fir are of high importance for selection forest management, and for the current aims laid out in Serbia's forest management focused on increasing the share of silver firs in Serbia's growing stock. With the objective of increasing the understanding of the growth characteristics of silver fir, the growth of two s...
Conference Paper
Full-text available
The role of remote sensing in forest biomass assessment is well defined and has been used to make assessments that range from local, regional to global scales. For large area biomass assessments, the limitations using remote sensing tools can be generally categorized into: 1. data availability and costs, 2. temporal coverage, 3. complexity of analy...
Article
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Many Eastern European countries still host landscapes with high value due to their habitat quality and size. Some of these countries are new member states of the European Union, and EU-accession is accompanied by huge investments in the develop-ment of traffic infrastructure. Environmental assessments mandatory for road constructions in the EU do n...
Conference Paper
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Results from biomass potential assessments vary considerably, both on global and European level. On the other hand reliable figures on biomass potentials are an important basis for energy policy and for strategies that aim at an increase of use of biomass for energy both on EU-Level as well as e. g. on national level in the National Renewable Energ...
Article
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Light detection and ranging (LiDAR) remote sensing offers new and improved capabilities for vertical and structural characterization of objects, such as plant height and different growth stages/strata, etc. Climate change will change tree and plant growth conditions and thus will change forest structure and distribution, which can potentially be st...
Conference Paper
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d h b i b Towards an earth observation b Towards an earth observation b i i f l l d monitoring of large scale da monitoring of large-scale da g g – E periences from de elopment Experiences from development Experiences from development P l d Poland Poland The work presented here is embedded in the project EUFODOS that is presented in a parallel post...
Technical Report
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Policy and decision makers in the EU have put energy policy objectives high on the agenda, including the promotion of the use of biomass as an energy source. European Community policy aims for a strong increase of renewable energy in the EU's overall energy mix (from little over 10 % today to 20 % by 2020) and a considerable increase of the share o...
Article
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The data on the state of the forest resources of Montenegro at the national level in the previous period were obtained by different methodologies (including sublimation of information contained in general and special Forest Management Plans, Forest Management Programmes, Operational Plans, etc.) and thus a lack of harmonization between them and the...
Book
Biomass resource assessments indicate the availability of biomass for energy production. This handbook provides best practices for determination of biomass resource potentials and gives guidance for transparent presentation of results. Methods are provided for forest biomass, energy crops, agricultural residues and organic waste. For each biomass t...
Conference Paper
Full-text available
Given the current high rank of the policy objectives for an increase of the use of renewable energy, a solid knowledge of the potentials of biomass for energy is crucial both for policy and industry. Since current potential estimates for the same area and biomass category differ considerably, a harmonisation of such potential estimates is necessary...
Article
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The present article outlines the possible use of public Airborne Laserscanning (ALS) data, furnished by the Bavarian Land Survey Administration for the assessment, evaluation and monitoring of FFH areas (Special Areas of Conservation SAC). First of all, the different information levels of importance for a characterization of FFH areas are defined....
Article
Full-text available
The present article outlines the possible use of public Airborne Laserscanning (ALS) data, furnished by the Bavarian Land Survey Administration for the assessment, evaluation and monitoring of FFH areas (Special Areas of Conservation SAC). First of all, the different information levels of importance for a characterization of FFH areas are defined....
Article
Full-text available
Accurate assessment of timber resources is of great importance for forest management. This article evaluates a combination of airborne laser scanning and color infrared (CIR) orthophotos to estimate the stem volume of forest stands using growth and yield tables recommended for the Federal State of Baden-Württemberg, Germany. The stand height, which...
Conference Paper
Full-text available
The overall objective of the Biomass Energy Europe (BEE) project is to improve the accuracy and comparability of future biomass resource assessments for energy by reducing heterogeneity, increasing harmonisation and exchanging knowledge. First, similarities and differences between the various approaches, methodologies and datasets used in biomass r...
Article
Full-text available
A literature review of new publications in the field of 3D data for forest applications shows that the application of airborne laser scanner data (ALS) is in the focus of research today due to its great potential for practical applications. While there is a lot of research carried out to derive forest management parameters based on laser metrics de...
Chapter
Full-text available
Starting with an in depth description of the user requirements that highlight an increased demand for up to date information on forests and of cost-efficient monitoring systems, applications using different data sources and techniques at various geographic levels are presented. The status of the established operational use of airborne and spaceborn...
Conference Paper
Full-text available
Timber Volume is one of the most important quantitative parameters to characterize a forest stand. This article evaluates a combination of Airborne Laser Scanning and GIS data to estimate timber volume of forest stands using standard forestry yield models. The input parameters into the models are the stand height and canopy density which are both d...
Technical Report
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This report is an Outcome of "Observatory for Nature Protection" (ONP) which was a sub-project othe EU-project "GEOLAND". So drafted end of 2006 the report is a bit outdated regarding the reviewed satellite data but not regarding the observable habitats parameters & characteristics. So I hope it can still serve as a guideline to the monitoring of h...
Article
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This research presents an automatic algorithm for trees outside forest (TOF) classification on scanned aerial photographs using an objected-oriented approach. TOF is defined as all trees outside the legal forest borders that comprise an area less than 2 ha. For classification purposes, an object must be a minimum distance of one Pixel from a forest...
Conference Paper
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The paper describes the GMES Service Element (GSE) project "Forest Monitoring" and outlines its relevance in the context of CORINE Land Cover.
Article
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Zusammenfassung: Zur Klassifizierung von Landbedeckungsarten wird in zunehmendem Maße auf das objektba-sierte Verfahren zurückgegriffen. Neben den durch den neuartigen Klassifizierungsansatz verbundenen Vorteilen, wie beispielsweise der Segmentierung kompakter Objekte, die dem menschlichen Wahrnehmungsvermögen ent-sprechen, hat diese Methode auch i...
Chapter
Full-text available
A national forest policy requires a solid information base on forests for three reasons. First, to fulfils international standards for the monitoring of forests, especially for carbon storage and biodiversity (Helsinki criteria, Kyoto protocol); second, to identify areas that require political action, including monitoring of the success of measures...
Conference Paper
Full-text available
Das Land Baden-Württemberg wurde in den Jahren 1990 und 1999 von den bisher schwersten Sturmschäden in Wäldern betroffen. Zur Erfassung der Schäden des Sturms Lothar 1999 hat die Forstverwaltung eine Befliegung im Maßstab 1:18000 in den Hauptschadgebieten durchgeführt. Hauptproblem dieser Lösung war die lange Zeitspanne vom Sturmereignis bis zur Be...
Article
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Aim of this articel is to realise automatic detection of five tree species (spruce, fir, douglase fir, larch and beech) by analysis of color and texture parameters of large scale color-infrared aerial photos (Tab. 1, 3). The preparatory work was done on a digital stereophotogrammetric workstation. This was the visual interpretation and delineation...
Chapter
Full-text available
This paper is based on results of a study in a state forest enterprise in Nordrhein-Westfalen, Germany. This study was motivated from both introducing new technological options, and the necessity to adapt and change the inventory and monitoring system within forest management due to developments and changes in the silvicultural concepts and changin...