Person: Schweitzer, Christian
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Schweitzer
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Christian
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Deutschland, Umweltbundesamt, Fachgebiet I.1.7-Umweltinformationssysteme/ -dienste, Satellitenfernerkundung, Dateninfrastruktur
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Veröffentlichung Understanding forest health with remote sensing, part III(2018) Lausch, Angela; Borg, Erik; Bumberger, Jan; Schweitzer, ChristianForest ecosystems fulfill a whole host of ecosystem functions that are essential for life on our planet. However, an unprecedented level of anthropogenic influences is reducing the resilience and stability of our forest ecosystems as well as their ecosystem functions. The relationships between drivers, stress, and ecosystem functions in forest ecosystems are complex, multi-faceted, and often non-linear, and yet forest managers, decision makers, and politicians need to be able to make rapid decisions that are data-driven and based on short and long-term monitoring information, complex modeling, and analysis approaches. A huge number of long-standing and standardized forest health inventory approaches already exist, and are increasingly integrating remote-sensing based monitoring approaches. Unfortunately, these approaches in monitoring, data storage, analysis, prognosis, and assessment still do not satisfy the future requirements of information and digital knowledge processing of the 21st century. Therefore, this paper discusses and presents in detail five sets of requirements, including their relevance, necessity, and the possible solutions that would be necessary for establishing a feasible multi-source forest health monitoring network for the 21st century. Namely, these requirements are: (1) understanding the effects of multiple stressors on forest health; (2) using remote sensing (RS) approaches to monitor forest health; (3) coupling different monitoring approaches; (4) using data science as a bridge between complex and multidimensional big forest health (FH) data; and (5) a future multi-source forest health monitoring network. It became apparent that no existing monitoring approach, technique, model, or platform is sufficient on its own to monitor, model, forecast, or assess forest health and its resilience. In order to advance the development of a multi-source forest health monitoring network, we argue that in order to gain a better understanding of forest health in our complex world, it would be conducive to implement the concepts of data science with the components: (i) digitalization; (ii) standardization with metadata management after the FAIR (Findability, Accessibility, Interoperability, and Reusability) principles; (iii) Semantic Web; (iv) proof, trust, and uncertainties; (v) tools for data science analysis; and (vi) easy tools for scientists, data managers, and stakeholders for decision-making support. Quelle: https://www.mdpi.comVeröffentlichung Land-Use Change Modelling in the Upper Blue Nile Basin(2016) Yalew, Seleshi G.; Mul, Marloes L.; van Griensven, Ann; Schweitzer, Christian; Teferi, Ermias; Priess, Joerg; van Der Zaag, PieterLand-use and land-cover changes are driving unprecedented changes in ecosystems and environmental processes at different scales. This study was aimed at identifying the potential land-use drivers in the Jedeb catchment of the Abbay basin by combining statistical analysis, field investigation and remote sensing. To do so, a land-use change model was calibrated and evaluated using the SITE (SImulation of Terrestrial Environment) modelling framework. SITE is cellular automata based multi-criteria decision analysis framework for simulating land-use conversion based on socio-economic and environmental factors. Past land-use trajectories (1986Ń2009) were evaluated using a reference Landsat-derived map (agreement of 84%). Results show that major land-use change drivers in the study area were population, slope, livestock and distances from various infrastructures (roads, markets and water). It was also found that farmers seem to increasingly prefer plantations of trees such as Eucalyptus by replacing croplands perhaps mainly due to declining crop yield, soil fertility and climate variability. Potential future trajectory of land-use change was also predicted under a business-as-usual scenario (2009Ń2025). Results show that agricultural land will continue to expand from 69.5% in 2009 to 77.5% in 2025 in the catchment albeit at a declining rate when compared with the period from 1986 to 2009. Plantation forest will also increase at a much higher rate, mainly at the expense of natural vegetation, agricultural land and grasslands. This study provides critical information to land-use planners and policy makers for a more effective and proactive management in this highland catchment. Quelle: http://www.mdpi.comVeröffentlichung Metadata describing the Kharaa Yeröö River Basin Water Quality Database(2018) Hofmann, Jürgen; Ibisch, Ralf; Karthe, Daniel; Schweitzer, ChristianIn the framework of the BMBF funded project on Integrated Water Resources Management in Central Asia (Model region Mongolia, MOMO project, www.iwrm-momo.de) the objectives focused on supplementing, validating and extending the existing surveillance monitoring to the entire river basin for the time series 2006-2017. The MOMO monitoring programme was set up in order to observe seasonal variation in various water quality parameters along the main river course and its tributaries. A detailed sampling survey was carried out along the Kharaa River in the spring, summer and autumn of 2006 to 2017, extending from the headwaters in the Khentii Mountains to the outlet of the river basin. An additional continuous monthly monitoring programme for surface water quality was carried out upstream (Deed Guur) and downstream of Darkhan city (Buren Tolgoi) including the outlet of WWTP Darkhan in the time between 2007 and 2017. This strategy provides information for the efficient and effective design of future monitoring programmes with a focus on operational or investigative issues. The types of water sampling programmes included initial surveys as well as investigative and operational monitoring, point-source characterization, intensive surveys, fixed-station-network monitoring, groundwater monitoring, and special surveys involving chemical and biological monitoring. The water analyses have a focus on nutrients, heavy metals and metalloids, chloride, boron and the main physical water parameters. The dataset comprises also fluvial sediment analyses on heavy metals. In addition in 2017 a special hygienic monitoring (total coliforms, E. coli and fecal coliforms) has been carried out and was included in this database.Veröffentlichung In Situ/Remote Sensing Integration to Assess Forest Health̶A Review(2016) Pause, Marion; Rosenthal, Michael; Keuck, Vanessa; Bumberger, Jan; Dietrich, Peter; Heurich, Marco; Jung, András; Lausch, Angela; Schweitzer, ChristianFor mapping, quantifying and monitoring regional and global forest health, satellite remote sensing provides fundamental data for the observation of spatial and temporal forest patterns and processes. While new remote-sensing technologies are able to detect forest data in high quality and large quantity, operational applications are still limited by deficits of in situ verification. In situ sampling data as input is required in order to add value to physical imaging remote sensing observations and possibilities to interlink the forest health assessment with biotic and abiotic factors. Numerous methods on how to link remote sensing and in situ data have been presented in the scientific literature using e.g. empirical and physical-based models. In situ data differs in type, quality and quantity between case studies. The irregular subsets of in situ data availability limit the exploitation of available satellite remote sensing data. To achieve a broad implementation of satellite remote sensing data in forest monitoring and management, a standardization of in situ data, workflows and products is essential and necessary for user acceptance. The key focus of the review is a discussion of concept and is designed to bridge gaps of understanding between forestry and remote sensing science community. Methodological approaches for in situ/remote-sensing implementation are organized and evaluated with respect to qualifying for forest monitoring. Research gaps and recommendations for standardization of remote-sensing based products are discussed. Concluding the importance of outstanding organizational work to provide a legally accepted framework for new information products in forestry are highlighted. Quelle: http://www.mdpi.comVeröffentlichung Widening the European Green Deal's perspective towards a sustainable Europe(Umweltbundesamt, 2021) Neßhöver, Carsten; Bannick, Claus Gerhard; Beckert, Barbara; Claussen, Ulrich; Doyle, Ulrike; Eckermann, Frauke; Frische, Tobias; Haße, Clemens; Günther, Jens; Hollweg, Beate; Huckestein, Burkhard; Janitzek, Timmo; Kabel, Claudia; Jering, Almut; Keßler, Hermann; Klatt, Anne; Knoche, Guido; Köder, Lea; Koller, Matthias; Krause, Bernd; Kreuser, Margarethe; Lindenthal, Alexandra; Löwe, Christian; Manstein, Christopher; Matthey, Astrid; Meurer, Doris; Mohaupt, Volker; Mutert, Tina; Obermaier, Nathan; Pieper, Silvia; Plickert, Sebastian; Rechenberg, Jörg; Reichart, Almut; Rönnefahrt, Ines; Schulte, Christoph; Schweitzer, Christian; Spengler, Laura; Stolzenberg, Hans-Christian; Suhr, Michael; Töpfer, Christoph; Unnerstall, Herwig; Deutschland. UmweltbundesamtThe European Green Deal, published by the European Commission in 2019, represents a new and ambitious approach to put environment and sustainability at the heart of European policy. Its ambitions are high, yet the planned measures might not be sufficient to actually meet them. The report analyzes the European Green Deal from the perspective of the German Environment Agency and places it in the context of the global challenge of achieving the United Nations' sustainable development goals. In addition to necessary measures in the thematic fields of the European Green Deal, the report also addresses the structural adjustments needed as key levers to achieve the desired goals. The report concludes that the European Green Deal is an important step forward, but that further efforts beyond those described there are still needed in order to achieve a sustainable Europe. Quelle: www.umweltbundesamt.deVeröffentlichung Linking the Remote Sensing of Geodiversity and Traits Relevant to Biodiversity-Part II: Geomorphology, Terrain and Surfaces(2020) Lausch, Angela; Schaepman, Michael E.; Skidmore, Andrew; Schweitzer, ChristianThe 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 ecosystem management. Numerous remote sensing (RS) approaches and platforms have been used in the past to enable a cost-effective, increasingly freely available, comprehensive, repetitive, standardized, and objective monitoring of geomorphological characteristics and their traits. This contribution provides a state-of-the-art review for the RS-based monitoring of these characteristics and traits, by presenting examples of aeolian, fluvial, and coastal landforms. Different examples for monitoring geomorphology as a crucial discipline of geodiversity using RS are provided, discussing the implementation of RS technologies such as LiDAR, RADAR, as well as multi-spectral and hyperspectral sensor technologies. Furthermore, data products and RS technologies that could be used in the future for monitoring geomorphology are introduced. The use of spectral traits (ST) and spectral trait variation (STV) approaches with RS enable the status, changes, and disturbances of geomorphic diversity to be monitored. We focus on the requirements for future geomorphology monitoring specifically aimed at overcoming some key limitations of ecological modeling, namely: the implementation and linking of in-situ, close-range, air- and spaceborne RS technologies, geomorphic traits, and data science approaches as crucial components for a better understanding of the geomorphic impacts on complex ecosystems. This paper aims to impart multidimensional geomorphic information obtained by RS for improved utilization in biodiversity monitoring. © 2020 by the authors.Veröffentlichung Linking remote sensing and geodiversity and their traits relevant to biodiversity(2019) Lausch, Angela; Baade, Jussi; Bannehr, Lutz; Schweitzer, ChristianIn 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 geodiversity, there is a lack of suitable monitoring methods. Compared to conventional in-situ techniques, remote sensing (RS) techniques provide a pathway towards cost-effective, increasingly more available, comprehensive, and repeatable, as well as standardized monitoring of continuous geodiversity on the local to global scale. This paper gives an overview of the state-of-the-art approaches for monitoring soil characteristics and soil moisture with unmanned aerial vehicles (UAV) and air- and spaceborne remote sensing techniques. Initially, the definitions for geodiversity along with its five essential characteristics are provided, with an explanation for the latter. Then, the approaches of spectral traits (ST) and spectral trait variations (STV) to record geodiversity using RS are defined. LiDAR (light detection and ranging), thermal and microwave sensors, multispectral, and hyperspectral RS technologies to monitor soil characteristics and soil moisture are also presented. Furthermore, the paper discusses current and future satellite-borne sensors and missions as well as existing data products. Due to the prospects and limitations of the characteristics of different RS sensors, only specific geotraits and geodiversity characteristics can be recorded. The paper provides an overview of those geotraits. Quelle: https://www.mdpi.comVeröffentlichung Cop-4-SDGs(2017) Schweitzer, ChristianVeröffentlichung Selected Trade-Offs and risks associated with land use transitions in central Germany(2019) Priess, Jörg A.; Hoyer, Christian; Jäckel, Greta; Schweitzer, ChristianFuture uncertainties and risks for socio-environmental systems are often addressed in the form of scenarios. This study aims to identify the biggest future risks and uncertainties for the study region Central Germany and the question which land use changes and impacts on selected ecosystem services related to agricultural production can be expected in the coming decades. For this purpose, we co-developed scenario storylines along the largest uncertainties, how the region may change with different stakeholders and used environmental models to simulate land-use changes and impacts on selected ecosystem services related to agricultural production. The study revealed that Climate change may have beneficial (e.g. maize, sugar beet) or adverse effects (e.g. barley, wheat) on crop yield levels, depending on crop type and level of climate change. In the scenarios crop production is additionally influenced by different levels of regional preferences influencing crop land extent (e.g., afforestation), crop management (e.g., organic production), and crop types used for food or bioenergy production. As driving factors such as climate change, land availability, and land management all influence agriculture, integrated studies like this are needed to assess future crop production. However, sustainability objectives may prefer other than the most productive agricultural pathways providing additional benefits such as regulating or cultural services. © Springer International Publishing AG, part of Springer Nature 2019Veröffentlichung Shaping sustainable digitisation(Umweltbundesamt, 2021) Arenhövel, Dorothee; Blum, Christopher; Cohors-Fresenborg, Dieter; Eick, Martina; Frien-Kossolobow, Lisa; Hagenah, Evelyn; Kiso, Claudia; Herrmann, Bianca; Koller, Matthias; Hoyer, Christian; Kohlmeyer, Regina; Köhn, Marina; Krack, Juri; Kristof, Kora; Lorenz, Andreas; Löwe, Christian; Menger, Matthias; Douglas, Martyn; Meurer, Doris; Mutert, Tina; Oehme, Ines; Schäfer, Marco; Schauser, Inke; Schlippenbach, Ulrike von; Schlippenbach, Ulrike von ; Schneider, Christian; Schultz-Krutisch, Thomas; Schweitzer, Christian; Sedello, Cornelia; Veenhoff, Sylvia; Töpfer, Christoph; Vogel, Julia; Wachotsch, Ulrike; Weiß, Ralf; Deutschland. UmweltbundesamtDigitisation is not only transforming our society it is also having an impact on the environment: On the one hand, digitisation can improve the state of the environment for example through digitally optimised production processes. On the other hand, negative environmental rebound effects can arise, like a higher demand for internet-enabled products from which an increase in usage of resources and energy during production processes results. With this impulse paper, UBA shows where digitisation can create opportunities and challenges for environmental policy. In doing so, UBA aims to help shape digitisation in line with the guiding principle of sustainability. Source: www.umweltbundesamt.de