Geospatial warning systems
|Project | GEOWARN Design | Transferability | Final Product | Innovation/Outlook|
Project > Methodologies > Satellite Imaging
Thermal Satellite Imaging
Landsat 7 satellite thermal images can be used as a volcano-monitoring tool,
as a large-scale overview with a thermal resolution of ±10°C. The
spatial terrain resolution is approximately 60 m, after reduction of atmospheric
and terrain (altitude and small-scale surface temperature) interferences.
Two field campaigns were conducted, one in September 2000 and the other in
October 2000. The campaigns aimed at collecting “ground truth” temperature
data, twice a day, to calibrate the surface temperatures computed from channel
6 of the satellite Landsat 7.
Fig. 20 The orthorectified and atmospheric corrected low
gain thermal band 6-1 of Landsat 7, ETM+ Image of Nisyros Island. The "1976
US Standard Atmospheric Model" has been used in ATCOR 3 software package
to perform the atmospheric correction. The temperature ranges from 12 to 28
°C. National Kapodistrian University of Athens (NKUA)
Fig. 21 Temperature map of the craters region in Nisyros.
A thermal anomaly indicated by red pixels inside Stephanos Crater can be observed.
Landsat 7 ETM, low gain, 20.10.2002, 20.28 GMT. National Kapodistrian University
of Athens (NKUA)
created by geopublic
|© 2003 eth zürich||Legal Disclaimer|