Areas with Surface Thermal Anomalies as Detected by ASTER and LANDSAT Data in Northern Saguache County, Colorado

This map shows areas of anomalous surface temperature in northern Saguache Counties 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.

本图描绘了萨瓜奇县北部异常地表温度区域，该区域通过 ASTER 和 LANDSAT 热数据以及基于空间辐射的模型进行识别。ASTER 数据的温度计算采用了发射率归一化算法，该算法将温度与发射率分离。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的模型。随后，通过从 ASTER 数据中提取的发射率，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对角斜线阴影表示，而在 LANDSAT 数据中存在异常温度的区域则用洋红色在地图上标注。地热温泉和具有优越地球化学特性的区域亦在图中呈现。地球化学条件不佳的泉眼或井则以蓝色点表示。