5 documents found in 105ms
# 1
Bareth, Georg • Aasen, Helge • Bendig, Juliane • Gnyp, Martin Leon • Bolten, Andreas • (et. al.)
Abstract: The non-destructive monitoring of crop growth status with field-based or tractor-based multi- or hyperspectral sensors is a common practice in precision agriculture. The demand for flexible, easy to use, and field scale systems in super-high resolution (<20 cm) or on single plant scale is given to provide in-field variability of crop growth status for management purposes. Satellite and airborne systems are usually not able to provide the spatial and temporal resolution for such purposes within a low-cost approach. The developments in the area of Unmanned Aerial Vehicles (UAV) seem to fill exactly that niche. In this contribution, we introduce two hyperspectral frame cameras weighing less than 1 kg which can be mounted to low-weight UAVs (<3 kg). The first results of a campaign in June 2013 are presented and the derived spectra from the hyperspectral images are compared to related spectra collected with a portable spectroradiometer. The results are promising.
# 2
Bendig, Juliane • Bareth, Georg
Abstract: The workshop on UAV-based Remote Sensing Methods for Monitoring Vegetation took place at the University of Cologne in September 2013 and was organized within the activities of the ISPRS Working Group VII/5 “Methods for Change Detection and Process Modelling” of the ISPRS Technical Commission VII “Thematic Processing, Modelling, and Analysis of Remotely Sensed Data”. The Institute of Bio- and Geosciences, Plant Sciences (IBG-2), of the Forschungszentrum Jülich as well as the following research projects supported and co-organized the workshop: The two Collaborative Research Centres, the CRC/TR32 “Patterns in Soil-Vegetation-Atmosphere-Systems: Monitoring, Modelling, and Data Assimilation” and the CRC806 “Our way to Europe: Culture-Environment Interaction and Human Mobility in the Late Quaternary” which are funded by the German Research Foundation (DFG). The CROP.SENSe.net research network which analyses plant phenotypes to enhance efficiency in crop breeding and decision making in crop management. The project is funded by the German Federal Ministry of Education and Research (BMBF) and by the Ziel 2-Programm NRW 2007–2013 “Regionale Wettbewerbsfähigkeit und Beschäftigung (EFRE)” by the Ministry for Innovation, Science and Research (MIWF) of the state North Rhine Westphalia (NRW) and European Union Funds for regional development (EFRE) (005-1103-0018). The International Center for Agro-Informatics and Sustainable Development (ICASD), which is a cooperation of the China Agricultural University and the University of Cologne. The publication of the Special Issue "UAV-Based Remote Sensing Methods for Modeling, Mapping, and Monitoring Vegetation and Agricultural Crops" of Remote Sensing (ISSN 2072-4292) and the Special Issue on "Spatial Data Acquisition, Handling, and Analysis in Agro-Geoinformatics" of the ISPRS International Journal of Geo-Information (ISSN 2220-9964) emerged in the context of this workshop.
# 3
Bareth, Georg • Bolten, Andreas • Bendig, Juliane
Abstract: The trend to minimize electronic devices also accounts for sensing and sensor technologies. In combination with the developments in the construction of low-weight unmanned airborne vehicles (UAVs), this enabled in the last years a new research and application field of low-cost and low-weight UAVs carrying all kind of sensors such as multi-spectral, hyperspectral, laserscanning, microwave, and thermal imaging devices. In the same period, the demand for local high resolution data in a spatial, temporal, and spectral context increased exponentially for all kinds of applications. Low-cost and low-weight UAVs can exactly acquire such data. Hence, it is no surprise that the deployment of Mini-UAVs in the field of environmental monitoring, agriculture, facility management and many more is growing fast.
Proceedings on the Workshop of Remote Sensing Methods for Change Detection and Process Modelling, 18-19 November 2010, University of Cologne, Germany, Kölner Geographische Arbeiten, 92, pp. 1-8
# 4
Hoffmeister, Dirk • Curdt, Constanze • Tilly, Nora • Bendig, Juliane
Abstract: Terrestrial laser scanning provides highly accurate and dense 3D measurements of an object. This technology leads to several applications, for example in topographic surveys, forestry, and as-built documentation. Few developments exist in the area of agriculture and precision farming. In this contribution, multi-temporal 3D terrestrial laser scanning was applied for field crop modelling. The time-of-flight laser scanner Riegl LMS-Z420i was used three to five times per year to estimate plant height distribution of the field crops winter wheat, spring barley, and sugar beet. In 2008 and 2009, the area under investigation was a single field. As a further development, data from plots with different crop varieties of barley and sugar beet were analysed in 2010. As a result, within-field variability was detected by using crop surface models (CSM) and crop volume models (CVM). Single plants were successfully detected. The results will be compared with additional data in the future.
Proceedings on the Workshop of Remote Sensing Methods for Change Detection and Process Modelling, 18-19 November 2010, University of Cologne, Germany, Kölner Geographische Arbeiten, 92, pp. 25-30
# 5
Hoffmeister, Dirk • Bendig, Juliane • Waldhoff, Guido
Abstract: Full-Waveform airborne laser scanning (ALS) is a novel method for observing the earth surface. It is suitable for the extraction of digital elevation models (DEM) and for estimating, for example buildings, single trees, and wooded areas, as 3D information. In this contribution, the processing of data from a flight survey with Riegl’s LMS-Q560 on 30 July 2008 is described. The accuracy of the extracted data was determined by comparison with official geodata and remote sensing data. For example, DEMs of the state survey office and land use classifications from satellite data were used. These data sets and the flight survey were realized within the Transregional Collaborative Research Centre 32 (CRC-TR32) 'Patterns in Soil-Vegetation-Atmosphere-Systems', which monitors patterns and fluxes in the Rurwatershed in Western Germany. Workflow and the results of the ALS data comparison are discussed in detail. ALS is an important method for deriving DEMs. Furthermore, it is capable of determining more information about the earth’s surface in a very accurate way.
Proceedings on the Workshop of Remote Sensing Methods for Change Detection and Process Modelling, 18-19 November 2010, University of Cologne, Germany, Kölner Geographische Arbeiten, 92, pp. 31-38
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