Skip to main content

Table 1 Some parameters of historical and current SAR satellite instruments used to measure volcano deformation

From: Synthesis of global satellite observations of magmatic and volcanic deformation: implications for volcano monitoring & the lateral extent of magmatic domains

Instrument Operation time Wavelength (cm) Swath width (km) Ground pixel resolution (m) Repeat time (days)
ERS-1,2 1991- 2000; 1995-2011 (gyroscope malfunction 2000 severely limits use) 5.6 80-100 26 x 6 35
JERS-1 1992-1998 23.5 75 18 x 6 44
RADARSAT-1, 2 1995-2013 (1); 2008 – (2) 5.6 multiple modes, including: 50 (Fine Beam Mode); 100 (Standard); 500 (ScanSAR Wide). multiple modes including: 5 × 8 (Fine Beam Mode); 25 × 28 (Standard); 100 (ScanSAR Wide) 24
ENVISAT 2002-2012 5.6 100 (image mode); 400 (wide swath) 30 × 30 (image mode); 150 × 150 (wide swath) 35
ALOS-1 2006-2011 23.5 70 (Fine Beam Single); 350 (ScanSAR) 10 (Fine Beam Single); 100 (ScanSAR) 46
ALOS-2 2014- 23.5 55 (Ultra Fine Beam Single); 490 (ScanSAR single) 3 (Ultra Fine Beam Single); 60 (ScanSAR single) 14
TerraSAR-X/TanDEM-X 2008 – (TSX); 2010- (TDX) 3.1 4 (Starting Spotlight); 30 (Stripmap); 270 (Wide ScanSAR) 0.25 (Staring Spotlight); 3 (Stripmap); 40 (Wide ScanSAR) 11
Sentinel-1a, b 2014 – date (a), 2016- date (b) 5.6 80 (Stripmap); 250 (interferometric wide swath); 400 (Extra wide swath) 5 × 5 (Stripmap); 5 × 20 (interferometric wide swath); 25 × 100 (extra wide swath) 12 (6 with 1b)
COSMO-SkyMed 1,2,3,4 Constellation staggered launches between 2007 and 2010, active to present. 3.1 10 (Spotlight-2); 40 (Stripmap); 100 (ScanSAR) 1 (Spotlight-2); 3-5 (Stripmap); 30 (ScanSAR) 16 (≥ 1 for full constellation)