Areas with Surface Thermal Anomalies as Detected by ASTER and LANDSAT Data in Ouray, Colorado

This map shows areas of anomalous surface temperature in Ouray identified from ASTER and LANDSAT thermal data and spatial based insolation model. The temperature for the ASTER data was 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 having anomalous temperature in the ASTER data are shown in blue diagonal hatch, while areas having anomalous temperature in the LANDSAT data are shown in magenta on the map. Thermal springs and areas with favorable geochemistry are also shown. Springs or wells having non-favorable geochemistry are shown as blue dots.

本图展示了Ouray地区通过ASTER和LANDSAT热数据以及基于空间辐射模型识别的异常地表温度区域。ASTER数据中的温度计算采用了发射率归一化算法，以分离温度与发射率。入射太阳辐射的计算基于由Fu和Rich（1999年）开发的基于空间辐射模型。随后，利用从ASTER数据中推导出的发射率，计算了由太阳辐射引起的温度。残余温度，即从ASTER温度中减去太阳辐射引起的温度，被用于识别热异常区域。在ASTER数据中存在异常温度的区域以蓝色斜对角网状图案表示，而在LANDSAT数据中存在异常温度的区域则以洋红色显示在地图上。温泉以及具有良好地球化学特性的区域亦被标注。具有不利地球化学特性的泉眼或井则以蓝色点表示。