Because of the colony effect of leafs in canopy

the complex mixture of sunlit

partly shaded and fully shaded leafs causes the phenomenon that radiant temperature for dense canopy are equal to the air temperature approximately. And based on the fact

we try to retrieve the air temperature from combined reflected solar and emitted terrestrial radiation with NDVI-T

s

space. The air temperature at the time of satellite passing through was estimated from the maximum and minimum air temperature measured in situ with Parton

&

Logan model and we still named it as "measured" air temperature. Then the results from NDVI-T

s

space and P-G method were validated with "measured" air temperature. The results showed that: the air temperatures estimated from remotely sensed image with P-G model were higher and the ones from NDVI-T

s

space were lower than "measured" averagely. But the remotely sensed air temperature estimated from the two methods is all with about +4℃ error compared with the "measured" air temperature. Although the NDVI-T

s

space method doesn’t improve P-G model from the error scale

the NDVI-T

s

space method is superior to P-G model because the former has used the remotly sensed infomation much fully than P-G model and has higher operation efficiency.