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Satellite Thermal Infrared Remote Sensing



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Satellite Thermal Infrared Remote Sensing Anna Colvin Michigan Technological University Houghton Michigan USA 7 March 2008 Satellite sensors detect electromagnetic radiation Jensen 2007 Blackbody Radiation Curves Detecting thermal emission associated with volcanic activity depends on Surface temperature of the lava process Area covered by thermal feature Longevity of activity Sensitivity of instrument Spatial resolution pixel size Temporal resolution overpass frequency Easier Harder Basaltic lava flows Lava domes Basaltic lava lakes Block lava flows Strombolian activity Phreatic activity Phreatomagmatic activity Fumarolic activity Geothermal activity Subtle thermal anomalies masked by Daytime solar heating and reflected radiation Wind redistributes thermal energy Surrounding volcaniclastics with low thermal inertia re radiate solar energy lowering thermal contrast Water acts as thermal sponge with high heat capacity Various TIR sensors MODIS AVHRR GOES but ASTER sensor with high spatial resolution and high radiometric sensitivity NE T 0 1 0 3 K is well suited to low temp geothermal heat sources can detect thermal anomalies of 3 5 C and size of 100m ASTER Advanced Spaceborne Thermal Emission Radiometer FLIR Satellite bands are chosen based on atmospheric transmission Basaltic lava flow Kliuchevskoi VNIR 08 Feb 2005 Daytime Active effusion Reflected radiation SWIR TIR Day Max T 97 56 C Basaltic lava flow Kliuchevskoi Night Max BT 97 56 C 09 Feb 2005 Nighttime SWIR TIR Basaltic Lava flow Fuego 1 9 days after eruption Max T 65 59 C Day 18 Jan 2004 TIR Solar heating Night 18 Jan 2004 TIR Max T 56 47 C Basaltic Lava flow Fuego 2 19 April 2005 Night time image Image acquired during effusion warm volcaniclastics in Santa Teresa Barranca Max T 96 72 C Cooling block lava flow Colima Effusion Sept Dec 2004 16 May 2006 Toe T 9 11 C Summit T 42 26 C 24 Nov 2006 Toe T 3 4 C Summit T 32 69 C 27 Nov 2007 Toe T 7 8 C Summit T 36 13 C Strombolian activity Pacaya VNIR SWIR TIR Max T



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