چکیده:
Temperature is considered as the basic element of climate and also the environmental limiting factor in Lut Desert.In this research, in order to identify the temperature of Lut Desert located in east of central Iran, using remote sensingdata, six series of MODIS sensor images related to June 24th & December 23rd 2002, and also January 22nd, March 22nd, June 22nd & September 24th 2003 were employed. The temperature rates have been estimated by using bandnumbers 31 and 32 with locative separation power of 1000 meters and considering the Sebal algorithm. According to
the results of temperature evaluation, the mean for land surface temperature in Lut Desert within the mentionedimages at 6 o clock Grinwich mean time have been; 49.6, 18.2, 22.0, 36.4,55.7 and 54.2 C, respectively. Settingrelation between calculated surface temperatures and recorded temperatures by meteorology stations indicated a meaningful correlation at 0.001 level. The rate of calculated determinant coefficients has been ranging from 0.91 to 0.72 per hour. Hence, the linier algorithms within surface soil temperatures of the six studied images and the recorded temperatures through meteorology stations were determined. According to these algorithms, the highest calculated airtemperature in the area with respect to images was 49.7 C (at 12:00) in June 22nd 2003 and the lowest 11.5 C (at03:00) Jan 22nd 2003. The results of this survey indicate that using MODIS sensor images seems to be suitable forestimating the Lut Desert temperature as well as temperature in other similar areas.
خلاصه ماشینی:
"In this research, in order to identify the temperature of Lut Desert located in east of central Iran, using remote sensing data, six series of MODIS sensor images related to June 24th & December 23rd 2002, and also January 22nd, March22nd, June 22nd & September 24th 2003 were employed.
But a research which seems to have a close relation to the subject matter of this study was done by Tawn Kumar Sen (2004) under the title of: Identifying rain water source using some satellite sensors and technique of Geographic Information system in which land surface temperature has been measured by using MODIS sensor images.
In order to determine the representative algorithm, the manner of relating surface data, attained from sensor with hourly recorded air temperatures at six meteorological stations (for calculating area air temperature from the recorded information at the meteorological stations) of Birjand synoptic, Khoor-e-Birjand, Tabas, Robat-Posht Badam, Shahdad, and Bam during the study days were used.
For a determination of the radiance power and estimating the region surface temperature (by using the images obtained from bands combination), entire soil covering map (scale 1:1000000), the area topography map (scale 1:250000), the entirely covering geomorphology map (scale 1:250000) as well as results of available reports and researches were digitalized.
Employing a larger number and more update images with high location separative power, exact field measuring [ for determining the exact type of surface soil in the region, exact geometric correction of images and calculating the radiance powers of different region surface soil materials, especially at salty- flats and desert regions can present the thermal and climatic features of the zone in a more exact and acceptable manner."