The Goddard Earth Science Data and Information Service Center's (GES DISC) innovative data analysis system Giovanni
is now hosting a new interface featuring increased spatial (1 kilometer) and temporal (8-day intervals) resolution land surface temperature data. The data interface, created to support regional investigations for the Monsoon Asia Integrated Regional Study (MAIRS)
, provides land surface temperature data from the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments onboard NASA'S Terra and Aqua earth observation satellites. Data products combining these spatial and temporal resolutions have not been available in Giovanni before, and they offer new capabilities for meteorological and climate research.
These data products are now accessible from the Giovanni mairs_8day
interface. The spatial coverage of these products in Giovanni is the Asia monsoon region (60°E-150°E, 0°-60°N) to support regional studies in the MAIRS program. The increased resolution data make it possible to study local climate variations, associated with variable land cover, and land use change due to urbanization and agriculture. The data can also assist in monitoring of forest fire events.
The data is available from March 2000 for MODIS-Terra (and July 2002 for MODIS-Aqua), and is updated as new data products arrive. The README document for MODIS 8-day 1km Land Surface Temperature in Giovanni
describes how the data in Giovanni are processed from the standard MODIS 8-day 1 km Land Surface Temperature & Emissivity products, MOD11A2.005 and MYD11A2.005. ("MOD" represents data from MODIS-Terra, "MYD" represents data from MODIS-Aqua).
Figure 1: MODIS-Terra 8-day nighttime land surface temperatures for the period July 4-11, 2010, over northeastern China. Temperature differences are discernible for urban areas, areas near the coast, and mountain areas in the northwestern part of this image. The temperature range of 282-302 degrees Kelvin corresponds to 8.85-28.85 degrees Centigrade (47.9-83.9 degrees Fahrenheit).
Figure 2: MODIS-Terra 8-day nighttime land surface temperatures for the period July 4-11, 2010, showing the warmer temperatures associated with urban areas. The largest warm area in the upper center of the image is the city of Beijing. To the southeast, near the western extension of Bo Hai Bay, is the Tianjin area. To the southwest of Beijing, the two largest warm areas correspond to the cities of Qingyuan and Shijiazhuang.
Figure 3: MODIS-Terra 8-day daytime land surface temperatures, displayed through Google Earth, averaged for summer 2009 (May 25 - August 29) over the Yangtze River Delta region of China. Yellow, orange, and red correspond to warm temperatures. Warmer land surface temperatures over cities, compared to rural areas, are particularly evident in this seasonal average. The large purple area in the center of the image is the freshwater lake Tai Hu ("Hu" means "lake" in Chinese).