||Volcanic eruptions and
wildfires pose serious hazards to sensitive ecosystems, transportation
and communication networks, and to populated
Using infrared satellite data
provided by the Moderate Resolution Imaging Spectroradiometer (MODIS),
scientists at the Hawai'i
Institute of Geophysics and Planetology, University of Hawai'i,
have developed an automated system which maps the global distribution
of thermal hot-spots in near-real-time, and displays the results on
Queries about the web-site itself should be directed at the site administrator:
MODIS is one of four sensors carried on-board NASA's first Earth Observing System (EOS) satellite 'Terra', which was launched in December 1999. Another MODIS sensor was launched on the second EOS satellite 'Aqua' in May 2002. For each image of the Earth's surface that MODIS collects, the MODVOLC algorithm automatically scans each 1 kilometre pixel within it to check for the presence of high-temperature hot-spots. When a hot-spot is found the date, time, location, and intensity of the hot-spot are recorded. MODIS looks at every square kilometre of the Earth's surface every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows us to provide at least 4 hot-spot observations every two days. Each day we compile updated global maps which display the locations of all hot-spots detected in the previous 24 hour period. By clicking on our target areas you can 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales. Clicking on the 'Text Alert File' link (which can be found directly beneath the main map) launches another window which contains detailed information about the hot-spots you are looking at (click here for an explanation of the contents of this file).
Click on the following link to see the hot-spots detected by the HIGP MODIS Thermal Alert System today. A map of the globe will appear, and the green dots are hot-spots. The MODVOLC algorithm is currently ∼8 hours behind, and is updated every hour. With the exception of a couple of two week periods during late 2000 and early 2001 when the sensor malfunctioned, you have direct access to our complete global hot-spot archive.
Publications and Information
AcknowledgementsWe would like to thank Rich Hucek, Andrey Savtchenko, and the members of the MODIS Science Data Support Team at Goddard Space Flight Center, for their efforts maintaining the MODIS data stream.
Use of the data© 2004, University of Hawai'i. Data can only be published with our permission.
Hawai'i Institute of
|Support for the HIGP MODIS
Thermal Alert System provided by: