1 Land Surface Temperature Measurements from EOS MODIS Data

• Main Author: Zhengming Wan
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1999
• Subjects: Kamchatka
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.540.8921; http://modis.gsfc.nasa.gov/MODIS/LAND/REPORTS/wan.2000.2.pdf

The quality of early MODIS TIR channel data was evaluated over some special lake sites which were apparently covered by melting snow/ice and surrounded with snow covers. The MODIS data over such a lake in Kamchatka, Russia on 13 April 2000 indicate that the ninth channel in bands 21 and 24, and the fourth channel in band 22 are very noisy, and that the maximum difference and standard deviation of band 31 brightness temperatures in a sub-area of 10 by 5 pixels are 0.24K and 0.04K, respectively. After skipping the noisy channels, the standard deviations in other bands but band 21 range from 0.10 to 0.68K, indicating satisfactory signal-to-noise ratios of the MODIS TIR data. Modifications were made in the product generation executive code PGE16 for the daily MODIS Land-surface Temperature (LST) product to avoid the effects of the noisy channels. A vicarious calibration field campaign was conducted in Bolivia during May 26 and June 17, 2000. The calculated band brightness temperatures based on lake surface temperatures measured by multiple IR radiometers and thermistors deployed in the high-elevation Lake Titicaca (3841m above sea level) and the atmospheric temperature and water vapor profiles measured by radiosondes launched by the lakeshore are well matched the MODIS TIR data produced by the new Level-1B code (version 2.4.2). On a perfect clear-sky day, 15 June 2000, all in-situ measurements were