Title :
Annual cycle in lakes and rivers from CryoSat-2 altimetry — The Brahmaputra river
Author :
Villladsen, H. ; Andersen, O.B. ; Stenseng, L.
Author_Institution :
DTU Space, Lyngby, Denmark
Abstract :
A key concern of the CryoSat-2 orbit has been its long repeat period of 369 days, which is usually undesirable for river and lake monitoring. However, the results of this study show that CryoSat-2 data can indeed be used for such monitoring by utilizing the high spatial coverage and the sub-cycle period of 30 days. The performance of CryoSat-2/SIRAL altimetry for river level monitoring is investigated by studying river levels retrieved from Ganges and Brahmaputra. An evaluation of CryoSat-2 river levels from LRM, SAR and SARIn data is performed by comparing with Envisat data from the period in which the two missions overlapped (2010-2012). Time series constructed using simple linear interpolation are fitted with a model to compare the captured annual signals and amplitudes. The annual cycles seen in CryoSat-2 and Envisat altimetry data agree very well and provide confidence in using CryoSat-2 data to continue river level archives from satellite radar altimetry.
Keywords :
lakes; remote sensing by radar; rivers; AD 2010 to 2012; Brahmaputra river; CryoSAT-2 altimetry; CryoSat-2 altimetry data; CryoSat-2 data; CryoSat-2 orbit; CryoSat-2 river levels; CryoSat-2-SIRAL altimetry; Envisat altimetry data; Envisat data; LRM data; SARIn data; lake annual cycle; lake monitoring; river annual cycle; river level archives; river level monitoring; river monitoring; satellite radar altimetry; Altimetry; Lakes; Monitoring; Radar tracking; Rivers; Satellites; Time series analysis; Brahmaputra; CryoSat; Envisat; hydrology; inland waters; satellite altimetry;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2014 IEEE International
Conference_Location :
Quebec City, QC
DOI :
10.1109/IGARSS.2014.6946569
