| Spatial distribution characteristics of land surface temperature retrieved from MODIS data in Ningxia Hui Autonomous Region |
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| DOI：10.7606/j.issn.1000-7601.2008.06.37 |
| Key Words: MODIS land surface temperature spatial distribution split window algorithm Ningxia |
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| Abstract: |
| The split window algorithm is a kind of simplified algorithm that is suitable for MODIS data． For retrieving the land surface temperature the paper discussed the calculation of some parameters for example brightness temperature atmospheric transmittance surface emissivity．In general the brightness temperature can be calculated from band31and band32using Planck Radiation Function．The atmospheric transmittance is usually simulated by atmospheric water vapour content which can be calculated from band2and band 19．The surface emissivity of earth can be calculated by normalized difference vegetation index （NDVI） that deduced from band1and band2in MODIS data．Based on this simplified split window algorithm the paper retrieves the land surface temperature of Ningxia Hui Autonomous Region．The results show that there are three different land surface temperature regions from south to north．We select a30km×30km sample area in each regions and analyze their land surface temperature．In mountain regions of southern Ningxia the land surface temperature distributes from19．7℃ to35．3℃ and it distributes averagely in the range．The average land surface temperature of mountain regions of southern Ningxia is27．1℃．The land surface temperature of irrigation regions distributes in25．9～37．1℃ and the main temperature point near in the low temperature part．The average land surface temperature of irrigation regions is27．1℃．The land surface temperature of Ningxia middle arid regions distributes in31．2～48．9℃ and the main temperature point near in the high temperature part．The average land surface temperature of this regions is45．8℃．All these temperature characteristics are matched with the Ningxia land surface characteristics such as vegetation coverage elevation forest distribution etc． |