3,282 research outputs found
MATCHING OF HIGH RESOLUTION OPTICAL DATA TO A SHADED DEM
No full textOne of the first essential steps in the analysis of satellite imagery is the orthorectification of the images. Orthorectification without ground control points (GCPs) using only the ephemeris and attitude data provided by the satellite operator provides an absolute accuracy of about 20 m to 1 km (depending on the satellite), which can be improved by measuring precise GCPs. In this paper, a method to obtain GCPs from an existing digital elevation model (DEM) is described and assessed. Since at least the SRTM DEM is available worldwide, DEMs could serve as a valuable additional source for the generation of GCPs. Furthermore, several planned and ongoing missions will increase the availability and accuracy of DEMs or stereo imagery respectively, e.g. ALOS, Tandem-X, etc
Amor Patriae Hannoverae / In Inclyta Ienensium Academia Publice Expressus A Davide Ruperto Erythropilo
No full textComposition of images
No full textComposition of the following images (left to right):
DOI: 10.5281/zenodo.6573536 - author: Müller, Johannes
DOI: 10.5281/zenodo.6573515 - author: Müller, Johannes
DOI: 10.5445/IR/1000145375 - author: Hugenschmidt, Milena
DOI: 10.5281/zenodo.6569281 - author: Rey, Simone
DOI: 10.5281/zenodo.6573446 - author: Müller, Johannes
DOI: 10.5281/zenodo.6567258 - author: Rey, Simone
DOI: 10.5281/zenodo.6575644 - authors: Müller, Johannes; Rothe, Martin
DOI: 10.5281/zenodo.6573463 - author: Müller, Johanne
Stereo Evaluation of CARTOSAT-1 Data Summary of DLR Results During CARTOSAT-1 Scientific Assessment Program
No full textThe Remote Sensing Technology Institute (IMF) of the German Aerospace Center (DLR) has more than 20 years of history in developing spaceborne stereo scanners and the corresponding stereo evaluation software systems. It takes part in the CARTOSAT-1 Scientific Assessment Program (C-SAP) as a principal investigator for German (Southeast Bavaria) and Spanish (Catalonia) test sites and as a Co-I for a French test site (Mausanne-les-Alpilles). A rich variety of landscapes is present in these three test sites. In all cases ground truth in form of GCP (or orthoimages of high resolution) and DTM/DSM (digital terrain or surface models) of sufficient accuracy have been delivered by the principal investigators.Rational polynomial functions (RPC) are provided by the distributing Indian agency (Space Applications Centre (SAC) of ISRO, Ahmedabad) as a universal sensor model for each scene. The inherent absolute orientation accuracy of the RPC models in the CARTOSAT-1 stereo imagery used here turned out to be around 100 m (normally). Thus, to exploit the high resolution of 2.5 m, RPC have to be corrected via the available ground truth. It is shown that the correction by an affine transformation is necessary in order to achieve sub-pixel accuracy in the stereo evaluation of full scenes. The remaining standard deviations of the residuals in image space during RPC correction are about 0.5-1 pixel in ground control points (GCP). Stereo evaluation is done by DLR processing software. Hierarchical intensity based matching and subsequent region growing are used to automatically derive a dense set of stereo tie points. An effective blunder reduction is based upon bi-directional LSM, quasi-epipolar reprojection of the tie points, and control of residuals in stereo forward intersection. Shifts between aft/fore orthoimages are found to be in sub-pixel range. DSM accuracy assessment is done via the statistics of height differences compiled by the forward intersection software. This is sufficient if accurate GCP for RPC correction are available. For direct comparison of the generated DSM with the reference DTM/DSM a 3D shift is estimated via least squares adjustment and mean and standard deviations of the DTM/DSM differences after shifting are provided. In summary, standard deviations of 2-4 m are achieved
A short proof of the ionization conjecture in Müller theory
No full textWe prove that in Müller theory, a nucleus of charge Z can bind at most Z+C electrons for a constant C independent of Z
Effects of disturbance patterns and deadwood on the microclimate in European beech forests
No full textMore frequent and severe disturbances increasingly open the forest canopy and initiate tree regeneration. Simultaneously, increasing weather extremes, such as drought and heat, are threatening species adapted to cool and moist climate. The magnitude of the microclimatic buffering capacity of forest canopies to mitigate hot and dry weather conditions and its disturbance-induced reduction remains poorly quantified. Also, the influence of disturbance legacies (e.g., deadwood) on forest microclimate is unresolved. In a unique manipulation experiment we investigated (i) the microclimatic buffering capacity of forest canopies in years with different climatic conditions; (ii) the impacts of spatial disturbance patterns on surface light and microclimate; and (iii) the effect of deadwood presence and type on microclimate. Treatments included two disturbance patterns (i.e., aggregated and distributed), four deadwood types (i.e., standing, downed, standing and downed, removed), and one untreated control (i.e., nine treatments in total), replicated at five sites dominated by European beech (Fagus sylvatica L.) in southeastern Germany. We measured forest floor light conditions and derived diurnal extremes and variation in temperature (T) and vapor pressure deficit (VPD) during four consecutive summer seasons (2016 – 2019). The buffering capacity of intact forest canopies was higher in warm and dry years. Surface light was significantly higher in spatially aggregated disturbance gaps compared to distributed disturbances of similar severity. An increase in surface light by 10 % relative to closed canopies elevated T(max) and VPD(max) by 0.42°C and 0.04 kPa, respectively. Deadwood presence and type did not affect the forest microclimate significantly. Microclimatic buffering under forest canopies can dampen the effects of climate change. However, increasing canopy disturbances result in more light penetrating the canopy, reducing the microclimatic buffering capacity of forests. We conclude that forest management should foster microclimatic buffering in forests as one element of a multi-pronged strategy to counter climate change
Romancı Yönüyle Herta Müller
No full textNobel Edebiyat ödülünü 2009 yılında kazanan Herta Müller, 1953 yılında Romanya'nın Almanca konuşulan Banat bölgesinde dünyaya geldi. Romanya'da Çavuşesku dönemini açıkça eleştirmesi nedeniyle Herta Müller kendi ülkesinde kitaplarının basılması yasaklandı. Herta Müller 1987 yılında Romanya'dan Almanya'ya göç etti. Yazarın hayatı, gizli polis teşkilatının ve Banat bölgesinin hayatındaki önemi, edebiyat dünyasındaki yeri ve sanatının günümüz için önemi araştırıldı. Yazarın şimdiye kadar yazmış olduğu "Der Fuchs war damals schon der Jäger", "Herztier", "Heute wäre ich mir lieber nicht begegnet" ve "Atemschaukel" adlı romanlarının ana sorunları, figürler, ana motifler, yapı özellikleri ve yazarın üslup özellikleri gibi altı başlık altında incelendi.Herta Müller, who was awarded the Nobel Prize in Literature in 2009, was born in Banat of Romania where German was spoken in 1953. Publication of her books in her own country was forbidden as she clearly criticised the period of Ceausescu in Romania. Herta Müller immigrated to Germany from Romania in the year of 1987. The life of the author, the importance of secret police service and the region of Banat on her life, her place in the literary world and the meaning of her art for today were searched. The novels she wrote up to now, namely "Der Fuchs war damals schon der Jäger", "Herztier", "Heute wäre ich mir lieber nicht begegnet" and "Atemschaukel", were examined under six titles like: Key Issues, Key Figures, Key Motifs, Structure Features and Author's Stylistic Features
"En tierras bajas" de Herta Müller: mirada crítica hacia las cicatrices de una infancia irrespirable
No full textThrough the look and narrative voice of a Romanian girl, the writer Herta Müller brings us closer with her first work – Niederungen (En tierras bajas) - to the still living scars of her own childhood in a small village in the region of Timisoara at the time of the dictatorship of Nicolae Ceausescu. This article attempts a critical approach to the recurring theme focused on the complaint of the country left behind by the author after her own experience of exile to West Germany in 1987. A critical analysis of this first work written by Müller in the German language brings us closer to her intercultural literature. The high quality of the literary production of this German-Romanian migrant writer was finally awarded in 2009 with the Nobel Prize for Literature.A través de la mirada y la voz narrativa de una niña rumana, la escritora Herta Müller nos acerca con su ópera prima Niederungen (En tierras bajas) a las cicatrices aún hoy vivas de su propia infancia en un pequeño pueblo ubicado en la región de Timisoara en la época de la dictadura de Nicolae Ceaucescu. Este artículo pretende una aproximación crítica a la recurrente temática centrada en la denuncia del país dejado atrás por la escritora tras su experiencia de exilio a la entonces Alemania occidental en el año 1987. Un análisis crítico de esta primera obra publicada por Müller en lengua alemana nos acerca a la literatura intercultural de la escritora migrante rumano-alemana cuya calidad y trayectoria literaria la hizo merecedora en 2009 del Premio Nobel de Literatura
Recall this Book 62: A Conversation with Jan-Werner Müller
No full textToday's guest is Princeton's Jan-Werner Müller, (Another Country: German Intellectuals, Unification and National Identity, A Dangerous Mind: Carl Schmitt in Post-War European Thought, Constitutional Patriotism) author of What is Populism? (2016) which explores how the identitarian logic of populism can come to lodge within democracies. Is the current success of the antidemocratic Right (in Hungary and Poland-and increasingly elsewhere in Europe as well) the product of "plutocratic populism"? Or is there some other more systemic maladjustment in Europe and America, whereby the ground rules for deliberative democracy have been skewed into a new stable shape, one that anti-democratic populist leaders have been able to capitalize on by borrowing from one another's dangerous playbooks
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