Areas of Anomalous Surface Temperature in Routt County, Colorado, as Identified from ASTER Thermal Data

This layer contains areas of anomalous surface temperature in Routt County identified from ASTER thermal data and spatial based insolation model. The temperature is calculated using the Emissivity Normalization Algorithm that separate temperature from emissivity. The incoming solar radiation was calculated using spatial based insolation model developed by Fu and Rich (1999). Then the temperature due to solar radiation was calculated using emissivity derived from ASTER data. The residual temperature, i.e. temperature due to solar radiation subtracted from ASTER temperature was used to identify thermally anomalous areas. Areas that had temperature greater than 2o were considered ASTER modeled very warm surface exposures (thermal anomalies). Note: 'o' is used in this description to represent lowercase sigma.

本图层包含从ASTER（Advanced Spaceborne Thermal Emission and Reflection Radiometer）热红外数据与空间尺度日照模型中识别得到的劳特县（Routt County）地表温度异常区域。地表温度通过发射率归一化算法（Emissivity Normalization Algorithm）计算得到，该算法可实现温度与发射率的分离。入射太阳辐射采用Fu与Rich（1999）提出的空间尺度日照模型进行计算。随后结合ASTER数据反演得到的发射率，计算得到由太阳辐射驱动的地表温度。残差温度，即从ASTER反演的地表温度中扣除太阳辐射驱动的温度后得到的差值，被用于识别热异常区域。温度高于2σ的区域被视为ASTER模拟的极暖地表裸露区（热异常区域）。注：本描述中使用'o'代表小写希腊字母σ。