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found that 
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43.0 
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41.6 
  
IAPRS & SIS, Vol.34, Part 7, “Resource and Environmental Monitoring”, Hyderabad, India, 2002 
the comparison of the AVHRR derived average 9 x 9 
window surface temperature (14.30 to ISI) with mid day 
surface air temperature for thè different stations over all the 
dates of satellite overpass. The correlation between ground 
estimates of near surface air temperature and satellite-derived 
temperature is 0.853. Greater scatter was noticed during 
early growth stages (December 15, January 15 ) compared to 
late growth stages (March 17 , April 14) crop season. 
  
G 55 
  
  
  
y (r = 0.85) > à Early (bias = 1.92) 
$50 °, © * late (bias = -5.5) 
Ë 45 + 
E 40 eo Nt S 
= o9 s es 
2735 > 
tx. Aa 4, 
BENT 
a 25 d y t T T y 
Corian 30 35 40 45 50 55 60 
Retrieved surface temperature (°C) 
Figure 3: A scatterplot between observed mid -day air temperature 
and satellite retrieved surface temperature during early and 
late rabi growing season 
The bias (February, March & April) (mean difference 
between satellite derived surface temperature and ground 
estimates of air temperature averaged overall observations) 
associated with early and late phase of rabi season is 1.92°C 
and —5.5°C, respectively. The results thus confirm that mid 
day surface air temperature is easier to model in a period of 
good vegetation cover when extreme temperatures are not 
present and no important hydric deficit exists. This is 
preliminary investigation of near surface air temperature 
mapping. A future endeavor will be to analyze the temporal 
series of temperature/vegetation index at full canopy cover 
for improved estimates of near surface air temperatures in a 
regional scale. 
5. CONCLUSIONS 
In the present study an attempt has been made to 
investigate slope of LST. NDVI relationship for different 
districts of Gujarat state and over five dates covering entire 
rabi growing season. The results shows that a strong dynamic 
negative correlation exists between LST and NDVI with 
greater steepness of slope (LST/NDVI) during mid growth 
stages (peak vegetative period). While validating retrieved 
surface temperature with ground estimates of mid day 
surface soil temperature and near surface air temperature was 
observed that retrieved surface temperature has good 
agreement with surface 
soil temperature for four dates and with near surface air 
temperature during peak vegetative period (i.e January). 
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