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Reinfried Mansberger

Other affiliations: Graz University of Technology
Bio: Reinfried Mansberger is an academic researcher from University of Natural Resources and Life Sciences, Vienna. The author has contributed to research in topics: Land management & Land use. The author has an hindex of 9, co-authored 51 publications receiving 350 citations. Previous affiliations of Reinfried Mansberger include Graz University of Technology.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a bundle of technologies was applied to monitor and document the landslide, such as geophysical methods (geoelectrics, inclinometer, soil moisture, and soil temperature) and Global Navigation Satellite System (GNSS) measurements.
Abstract: In June 2013, heavy precipitation triggered a large earthflow of several million cubic meters in a small village in Austria. A bundle of technologies was applied to monitor and document the landslide, such as geophysical methods (geoelectrics, inclinometer, soil moisture, and soil temperature) and Global Navigation Satellite System (GNSS) measurements. Additionally, an Unmanned Aerial Vehicle (UAV) was used for the periodical assessment of the landslide process. In total, nine flights were performed with a multicopter equipped with a digital single-lens reflex camera (DSLR) that delivered several thousands of images. Based on these images and detailed GNSS measurements of the landslide area, orthophotos as well as generated Digital Surface Models (DSMs) with an accuracy of less than ±10 cm resulted. Fissure tracking, flow direction and velocity, and mass balances as well as the construction progress of the protection and mitigation measures were derived from these data sets. The application of the UAV turned out to be a cost- and time-effective tool for landslide-monitoring that provides researchers and engineers with accurate high-resolution geodata.

95 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a method for the survey of microtopographic soil surface changes caused by erosion and investigate the development of sediment transport and rill erosion in the inter-rill and Rill areas for a given rainfall event.
Abstract: Understanding the spatial pattern of erosion in inter-rill and rill areas can be useful in locating sources of sediment and in determining down-slope sediment delivery. However, spatial information about erosion processes in the inter-rill and rill areas under field conditions is often limited owing to the non-availability of a detailed microtopography. This paper aims to present a method for the survey of microtopographic soil surface changes caused by erosion and to investigate the development of sediment transport and rill erosion in the inter-rill and rill areas for a given rainfall event. The approach is based on the application of close range digital photogrammetry to produce differences of digital elevation models (DEMs), automatically measured and generated but with manual 3D point editing. Quality analysis of the DEM measurements has shown that erosion and deposition can be detected with a relative error of ±2·8 to ±5·3 mm. The minimum average sediment yield from plots with an area of 53 m2after the occurrence of 46 to 70 mm of erosive rainfall was estimated to be 1·24 to 3·5 kg m−2. The spatial pattern of erosion and deposition on inter-rill and rill areas has proved the relative efficiency of rills to transport sediments from inter-rill areas with a sediment delivery ratio greater than one. Thus at erosive rainfall events, the transport capacity of the rill flow was not a limiting condition. The rill network was controlled by abrupt change in surface microtopography where rough surfaces produced many smaller rills but fewer contributing rills than relatively smooth surfaces. Tillage-induced surface roughness, the presence of stones and sparse vegetation, and the borders of individual plots were found to present challenges to the photogrammetric techniques, and to introduce errors which inhibit fully automatic DEM generation. The precision of the DEMs was constrained by the precision of ground control points (GCPs), camera lens distortion towards format edges and DEM extraction parameters. Despite this limitation, however, the application of digital photogrammetry enabled the measurement of high-frequency microtopographic surfaces and characterisation of the spatial distribution of erosion and deposition and of rill erosion development during highly erosive rainfall events.

79 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of two different long-term soil management experiments on soil roughness and the process of soil consolidation were examined, and the photogrammetric method was applied to test these assumptions, and various soil surface roughness indices were successfully identified different initial roughness values.
Abstract: Soil surface characteristics affect soil–water interactions and are in turn influenced by a variety of soil properties. Likewise, the state and temporal change of soil surface roughness are major drivers for the interaction between soil and water. The use of different tillage tools such as plough or chisel directly affects soil roughness parameters. Moreover, soil roughness and soil consolidation after management may also be affected indirectly through the effect of different management practices on soil properties. This study examines the effects of two different long-term soil management experiments on soil roughness and the process of soil consolidation. At site Fuchsenbigl (FB), conventional tillage has been compared to reduced tillage since 1988. At site Ritzlhof (RH), three different methods of fertilization (green waste, mineral fertiliser, no fertiliser application) have been tested since 1991. We assumed that the different management practices had influenced soil properties – most likely organic carbon content – affecting soil roughness and soil consolidation. The photogrammetric method was applied to test these assumptions, and various soil surface roughness indices (random roughness, orientated roughness, limiting slope, limiting distance, tortuosity) successfully identified different initial roughness values. The limiting elevation difference index ( Linden and van Doren, 1986 ) revealed significant differences between the sites FB 2012 (17 mm) and RH 2012 (28 mm) and between different years RH 2013 (22 mm) after chiselling. We attributed the site distinction to the different soil textures and the temporal differences to the different water contents at time of management. The decay of roughness for all sites and treatments (n = 276) parameterized by the RR Index followed the equation RR = 94.6 e−0.001. We were also able to distinguish significant consolidation effects of different long-term treatments with respect to tillage intensity at site FB. The maximum consolidation for reduced tillage was 13.8 mm compared to 16.8 mm for conventional treatment. In contrast, no effects of different fertiliser application at site RH were observed. For all sites and treatments (n = 35), soil consolidation (C in mm) due to precipitation (P in mm) followed the equation C = 4.23 × ln(1 + P) with an r2 of 0.71.

48 citations

Journal ArticleDOI
12 Oct 2019-Land
TL;DR: In this paper, the authors investigated the determinants influencing the willingness of landholder farmers to participate in voluntary land consolidation processes and found that land consolidation is a proper tool to solve inefficiencies in agricultural production, as it enables consolidating plots based on the consent of landholders.
Abstract: In many African countries and especially in the highlands of Ethiopia—the investigation site of this paper—agricultural land is highly fragmented. Small and scattered parcels impede a necessary increase in agricultural efficiency. Land consolidation is a proper tool to solve inefficiencies in agricultural production, as it enables consolidating plots based on the consent of landholders. Its major benefits are that individual farms get larger, more compact, contiguous parcels, resulting in lower cultivation efforts. This paper investigates the determinants influencing the willingness of landholder farmers to participate in voluntary land consolidation processes. The study was conducted in Gozamin District, Amhara Region, Ethiopia. The study was mainly based on survey data collected from 343 randomly selected landholder farmers. In addition, structured interviews and focus group discussions with farmers were held. The collected data were analyzed quantitatively mainly by using a logistic regression model and qualitatively by using focus group discussions and expert panels. According to the results, landholder farmers are predominantly willing to participate in voluntary land consolidation (66.8%), while a substantive fraction of farmers express unease with voluntary land consolidation. The study highlighted the following four determinants to be significant in influencing the willingness of farmers for voluntary land consolidation: (1) the exchange should preferably happen with parcels of neighbors, (2) land consolidation should lead to better arranged parcels, (3) nearness of plots to the farmstead, and (4) an expected improvement in productivity. Interestingly, the majority of farmers believes that land consolidation could reduce land use conflicts. The study provides evidence that policymakers should consider these socio-economic, legal, cultural, infrastructural, and land-related factors when designing and implementing voluntary land consolidation policies and programs.

26 citations

Journal ArticleDOI
TL;DR: Two programme systems developed for the Kern DSR analytical stereo-plotter for mapping with spaceborne stereo-imagery are presented, one for images acquired by the SPOT HRV sensor, the other one for stereo-mensuration of SAR images.
Abstract: Three-dimensional restitution of images with unconventional imaging geometry can be performed in an operational mode using existing commercial analytical plotters without any extra investments in hardware. The paper presents two programme systems developed for the Kern DSR analytical stereo-plotter for mapping with spaceborne stereo-imagery, one for images acquired by the SPOT HRV sensor, the other one for stereo-mensuration of SAR images. Due to the movement of the satellite platforms the software requires appropriate algorithms for the consideration of time-varying orientation parameters like sensor position, sensor attitude or others. The performance of the programme systems is demonstrated with practical results derived from Space Shuttle SIR-B imagery as well as from SPOT images showing realistically achievable accuracies of a few pixels in planimetry.

20 citations


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01 Jan 2016
TL;DR: The remote sensing and image interpretation is universally compatible with any devices to read and is available in the digital library an online access to it is set as public so you can get it instantly.
Abstract: Thank you very much for downloading remote sensing and image interpretation. As you may know, people have look hundreds times for their favorite novels like this remote sensing and image interpretation, but end up in malicious downloads. Rather than reading a good book with a cup of tea in the afternoon, instead they are facing with some malicious virus inside their computer. remote sensing and image interpretation is available in our digital library an online access to it is set as public so you can get it instantly. Our book servers spans in multiple countries, allowing you to get the most less latency time to download any of our books like this one. Merely said, the remote sensing and image interpretation is universally compatible with any devices to read.

1,802 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used the structure-from-motion (SfM) and multi-view-stereo (MVS) algorithms to estimate erosion rates along a 50m-long coastal cliff.
Abstract: Topographic measurements for detailed studies of processes such as erosion or mass movement are usually acquired by expensive laser scanners or rigorous photogrammetry. Here, we test and use an alternative technique based on freely available computer vision software which allows general geoscientists to easily create accurate 3D models from field photographs taken with a consumer-grade camera. The approach integrates structure-from-motion (SfM) and multi-view-stereo (MVS) algorithms and, in contrast to traditional photogrammetry techniques, it requires little expertise and few control measurements, and processing is automated. To assess the precision of the results, we compare SfM-MVS models spanning spatial scales of centimeters (a hand sample) to kilometers (the summit craters of Piton de la Fournaise volcano) with data acquired from laser scanning and formal close-range photogrammetry. The relative precision ratio achieved by SfM-MVS (measurement precision : observation distance) is limited by the straightforward camera calibration model used in the software, but generally exceeds 1:1000 (i.e. centimeter-level precision over measurement distances of 10s of meters). We apply SfM-MVS at an intermediate scale, to determine erosion rates along a ~50-m-long coastal cliff. Seven surveys carried out over a year indicate an average retreat rate of 0.70±0.05 m a-1. Sequential erosion maps (at ~0.05 m grid resolution) highlight the spatio-temporal variability in the retreat, with semivariogram analysis indicating a correlation between volume loss and length scale. Compared with a laser scanner survey of the same site, SfM-MVS produced comparable data and reduced data collection time by ~80%.

859 citations

Journal ArticleDOI
TL;DR: It is shown that the performance of split-band interferometry is close to the Crame/spl acute/r-Rao bound for a broad variety of bandwidth ratios, and Delta-k systems are proposed to best take advantage of the available radar bandwidth.
Abstract: Estimation of differential shift of image elements between two synthetic aperture radar (SAR) images is the basis for many applications, like digital elevation model generation or ground motion mapping. The shift measurement can be done nonambiguously on the macro scale at an accuracy depending on the range resolution of the system or on the micro scale by employing interferometric methods. The latter suffers from phase cycle ambiguities and requires phase unwrapping. Modern wideband high-resolution SAR systems boast resolutions as small as a few tens of a wavelength. If sufficiently many samples are used for macro-scale shift estimation, the accuracy can be increased to a small fraction of a resolution cell and even in the order of a wavelength. Then, accurate absolute ranging becomes precise enough to support phase unwrapping or even make it obsolete. This letter establishes a few fundamental equations on the accuracy bounds of shift estimation accuracy for several algorithms: coherent speckle correlation, incoherent speckle correlation, split-band interferometry, a multifrequency approach, and correlation of point scatterers in clutter. It is shown that the performance of split-band interferometry is close to the Crame/spl acute/r-Rao bound for a broad variety of bandwidth ratios. Based on these findings, Delta-k systems are proposed to best take advantage of the available radar bandwidth.

259 citations

Journal ArticleDOI
TL;DR: In this article, the authors reviewed Ethiopia's experience and research progress in past soil and water conservation (SWC) efforts and suggested possible solutions for improving the overall current soil erosion rates are highly variable and large by international standards, and sheet, rill and gully erosion are the dominant processes.
Abstract: This paper reviews Ethiopia’s experience and research progress in past soil and water conservation (SWC) efforts and suggests possible solutions for improvement. Although indigenous SWC techniques date back to 400 BC, institutionalized SWC activity in Ethiopia became significant only after the 1970s. At least six national SWC-related programs have been initiated since the 1970s and their focus over time has shifted from food relief to land conservation and then to livelihoods. The overall current soil erosion rates are highly variable and large by international standards, and sheet, rill, and gully erosion are the dominant processes. The influence of human activities on the landscape has traditionally been deleterious, but this trend seems to have recently reversed in some parts of the country following the engagement of the communities in land management. The efficiency of SWC measures show mixed results that are influenced by the type of measures and the agro-ecology under which they were implemented; i...

225 citations