Areas of Anomalous Surface Temperature in Alamosa and Saguache Counties, Colorado, as Identified from ASTER Thermal Data

This layer contains areas of anomalous surface temperature in Alamosa and Saguache Counties 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.

本图层包含基于高级星载热发射与反射辐射计（ASTER）热红外数据及空间化日照辐射模型，于阿拉莫萨县与萨加奇县境内识别出的地表温度异常区域。本次研究所用的地表温度通过发射率归一化算法计算得到，该算法可实现温度与发射率的分离。入射太阳辐射总量通过Fu与Rich（1999）提出的空间化日照辐射模型计算获得。随后，利用ASTER数据反演得到的发射率，可计算得到太阳辐射驱动的地表温度。将ASTER反演得到的地表温度减去太阳辐射驱动的地表温度，所得剩余温度可用于识别热异常区域。地表温度超出2σ的区域被认定为ASTER反演得到的极暖地表暴露区（热异常区）。备注：本描述中所用的‘o’代表小写希腊字母σ（西格玛）。