TY  - JOUR
A1  - Heine, Iris
A1  - Francke, Till
A1  - Rogass, Christian
A1  - Medeiros, Pedro Henrique Augusto
A1  - Bronstert, Axel
A1  - Förster, Saskia
T1  - Monitoring seasonal changes in the water surface areas of reservoirs using TerraSAR-X time series data in semiarid northeastern Brazil
JF  - IEEE journal of selected topics in applied earth observations and remote sensing
N2  - The 933 km(2) Bengue catchment in northeastern Brazil is characterized by distinct rainy and dry seasons. Precipitation is stored in variously sized reservoirs, which is essential for the local population. In this study, we used TerraSAR-X SM(HH) data for an one-year monitoring of seasonal changes in the reservoir areas from July 2011 to July 2012. The monitoring was based on acquisitions in the ascending pass direction, complemented by occasional descending-pass images. To detect water surface areas, a histogram analysis followed by a global threshold classification was performed, and the results were validated using in situ GPS data. Distinguishing between small reservoirs and similar looking dark areas was difficult. Therefore, we tested several approaches for identifying misclassified areas. An analysis of the surface area dynamics of the reservoirs indicated high spatial and temporal heterogeneities and a large decrease in the total water surface area of the reservoirs in the catchment by approximately 30% within one year.
KW  - Image classification
KW  - monitoring
KW  - radar imaging
KW  - remote sensing
KW  - synthetic aperture radar (SAR)
Y1  - 2014
U6  - https://doi.org/10.1109/JSTARS.2014.2323819
SN  - 1939-1404
SN  - 2151-1535
VL  - 7
IS  - 8
SP  - 3190
EP  - 3199
PB  - Inst. of Electr. and Electronics Engineers
CY  - Piscataway
ER  - 
TY  - JOUR
A1  - Heinrich, Ingo
A1  - Balanzategui, Daniel
A1  - Bens, Oliver
A1  - Blasch, Gerald
A1  - Blume, Theresa
A1  - Boettcher, Falk
A1  - Borg, Erik
A1  - Brademann, Brian
A1  - Brauer, Achim
A1  - Conrad, Christopher
A1  - Dietze, Elisabeth
A1  - Dräger, Nadine
A1  - Fiener, Peter
A1  - Gerke, Horst H.
A1  - Güntner, Andreas
A1  - Heine, Iris
A1  - Helle, Gerhard
A1  - Herbrich, Marcus
A1  - Harfenmeister, Katharina
A1  - Heussner, Karl-Uwe
A1  - Hohmann, Christian
A1  - Itzerott, Sibylle
A1  - Jurasinski, Gerald
A1  - Kaiser, Knut
A1  - Kappler, Christoph
A1  - Koebsch, Franziska
A1  - Liebner, Susanne
A1  - Lischeid, Gunnar
A1  - Merz, Bruno
A1  - Missling, Klaus Dieter
A1  - Morgner, Markus
A1  - Pinkerneil, Sylvia
A1  - Plessen, Birgit
A1  - Raab, Thomas
A1  - Ruhtz, Thomas
A1  - Sachs, Torsten
A1  - Sommer, Michael
A1  - Spengler, Daniel
A1  - Stender, Vivien
A1  - Stüve, Peter
A1  - Wilken, Florian
T1  - Interdisciplinary Geo-ecological Research across Time Scales in the Northeast German Lowland Observatory (TERENO-NE)
JF  - Vadose zone journal
N2  - The Northeast German Lowland Observatory (TERENO-NE) was established to investigate the regional impact of climate and land use change. TERENO-NE focuses on the Northeast German lowlands, for which a high vulnerability has been determined due to increasing temperatures and decreasing amounts of precipitation projected for the coming decades. To facilitate in-depth evaluations of the effects of climate and land use changes and to separate the effects of natural and anthropogenic drivers in the region, six sites were chosen for comprehensive monitoring. In addition, at selected sites, geoarchives were used to substantially extend the instrumental records back in time. It is this combination of diverse disciplines working across different time scales that makes the observatory TERENO-NE a unique observation platform. We provide information about the general characteristics of the observatory and its six monitoring sites and present examples of interdisciplinary research activities at some of these sites. We also illustrate how monitoring improves process understanding, how remote sensing techniques are fine-tuned by the most comprehensive ground-truthing site DEMMIN, how soil erosion dynamics have evolved, how greenhouse gas monitoring of rewetted peatlands can reveal unexpected mechanisms, and how proxy data provides a long-term perspective of current ongoing changes.
Y1  - 2018
U6  - https://doi.org/10.2136/vzj2018.06.0116
SN  - 1539-1663
VL  - 17
IS  - 1
PB  - Soil Science Society of America
CY  - Madison
ER  -