III. Sozialkundeschulbücher
In: Deutsch-israelische Schulbuchempfehlungen, S. 79-92
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In: Deutsch-israelische Schulbuchempfehlungen, S. 79-92
Imagery from medium resolution satellites, such as Landsat, have long been used to map forest disturbances in the tropics. However, the Landsat spatial resolution (30 m) has often been considered too coarse for reliably mapping small-scale selective logging. Imagery from the recently launched Sentinel-2 sensor, with a resampled 10 m spatial resolution, may improve the detection of forest disturbances. This study compared the performance of Landsat 8 and Sentinel-2 data for the detection of selective logging in an area located in the Brazilian Amazon. Logging impacts in seven areas, which had governmental authorization for harvesting timber, were mapped by calculating the difference of a self-referenced normalized burn ratio (ΔrNBR) index over corresponding time periods (2016–2017) for imagery of both satellite sensors. A robust reference dataset was built using both high- and very-high-resolution imagery. It was used to define optimum ΔrNBR thresholds for forest disturbance maps, via a bootstrapping procedure, and for estimating accuracies and areas. A further assessment of our approach was also performed in three unlogged areas. Additionally, field data regarding logging infrastructure were collected in the seven study sites where logging occurred. Both satellites showed the same performance in terms of accuracy, with area-adjusted overall accuracies of 96.7% and 95.7% for Sentinel-2 and Landsat 8, respectively. However, Landsat 8 mapped 36.9% more area of selective logging compared to Sentinel-2 data. Logging infrastructure was better detected from Sentinel-2 (43.2%) than Landsat 8 (35.5%) data, confirming its potential for mapping small-scale logging. We assessed the impacted area by selective logging with a regular 300 m × 300 m grid over the pixel-based results, leading to 1143 ha and 1197 ha of disturbed forest on Sentinel-2 and Landsat 8 data, respectively. No substantial differences in terms of accuracy were found by adding three unlogged areas to the original seven study sites. ; Forestry, Faculty of ; Other UBC ; Non UBC ; Forest Resources Management, Department of ; Reviewed ; Faculty
BASE
Imagery from medium resolution satellites, such as Landsat, have long been used to map forest disturbances in the tropics. However, the Landsat spatial resolution (30 m) has often been considered too coarse for reliably mapping small-scale selective logging. Imagery from the recently launched Sentinel-2 sensor, with a resampled 10 m spatial resolution, may improve the detection of forest disturbances. This study compared the performance of Landsat 8 and Sentinel-2 data for the detection of selective logging in an area located in the Brazilian Amazon. Logging impacts in seven areas, which had governmental authorization for harvesting timber, were mapped by calculating the difference of a self-referenced normalized burn ratio (&Delta ; rNBR) index over corresponding time periods (2016&ndash ; 2017) for imagery of both satellite sensors. A robust reference dataset was built using both high- and very-high-resolution imagery. It was used to define optimum &Delta ; rNBR thresholds for forest disturbance maps, via a bootstrapping procedure, and for estimating accuracies and areas. A further assessment of our approach was also performed in three unlogged areas. Additionally, field data regarding logging infrastructure were collected in the seven study sites where logging occurred. Both satellites showed the same performance in terms of accuracy, with area-adjusted overall accuracies of 96.7% and 95.7% for Sentinel-2 and Landsat 8, respectively. However, Landsat 8 mapped 36.9% more area of selective logging compared to Sentinel-2 data. Logging infrastructure was better detected from Sentinel-2 (43.2%) than Landsat 8 (35.5%) data, confirming its potential for mapping small-scale logging. We assessed the impacted area by selective logging with a regular 300 m × ; 300 m grid over the pixel-based results, leading to 1143 ha and 1197 ha of disturbed forest on Sentinel-2 and Landsat 8 data, respectively. No substantial differences in terms of accuracy were found by adding three unlogged areas to the original seven study sites.
BASE
In: The international journal of transgenderism: IJT, Band 18, Heft 3, S. 264-270
ISSN: 1434-4599
Resumen del trabajo presentado al Symposium on Surface Science (3S), celebrado en Baqueira Beret, Lleida, Spain del 6 al 12 de marzo de 2011. ; Support by the Spanish Ministerio de Ciencia e Innovación (ref. FIS2010-19609-C02-01) and Basque Government – UP/EHU (No. IT-366-07) is gratefully acknowledged. ; Peer reviewed
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In: Schriftenreihe der Arbeits- und Forschungsstelle Demokratieförderung und Extremismusprävention [Band 15]
Die Auseinandersetzung um Migration und Zugehörigkeit gilt als ein zentrales Konfliktfeld unserer Gesellschaft. Insbesondere im Kontext der Fluchtzuwanderung der zurückliegenden Jahre wurden verstärkte Polarisierungstendenzen und Konflikte entlang zuwanderungsbezogener Positionierungen problematisiert. Auf lokaler Ebene schlug sich diese Konflikthaftigkeit in sozialräumlichen Konflikten nieder, die bisweilen eskalierten und in gewalttätige Übergriffe auf Migrantinnen und Migranten sowie deren Einrichtungen und Unterstützer:innen mündeten. Dabei gelang es nicht selten rechtsextremen Akteuren, diese Konfliktgeschehnisse zu instrumentalisieren und lokale Bevölkerungsgruppen für fremdenfeindliche und rassistische Aktionen zu mobilisieren. Der Sammelband "Lokale Konflikte in der Migrationsgesellschaft - Konflikterscheinungen und Konfliktbearbeitung" in Herausgeberschaft von Sally Hohnstein, Joachim Langner und Maren Zschach greift diese Entwicklungen auf und versammelt aktuelle wissenschaftliche sowie fachpraktische Perspektiven auf lokale Konflikte in der Migrationsgesellschaft. Er fragt nach den Erscheinungsformen konflikthafter Ereignisse vor Ort sowie nach Möglichkeiten, Konflikte aufzufangen und in geregelte Bearbeitungen zu überführen. Er verbindet Analysen spezifischer lokaler Konfliktkonstellationen mit kritischen Reflexionen fachlichen Handelns in der professionellen Bearbeitung von Konflikten. Damit leistet der Band einerseits einen wichtigen Beitrag zur Forschungsdiskussion im Themenfeld. Andererseits bietet er Handlungsorientierungen für Fachkräfte vor Ort, die in ihrer alltäglichen Arbeit mit lokalen Konfliktlagen in der Migrationsgesellschaft konfrontiert sind.
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In: STOTEN-D-22-28590
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