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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Comparison of the response of the Landsat 7 Enhanced Thematic Mapper Plus and the Earth Observing-1 Advanced Land Imager over active lava flows
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Comparison of the response of the Landsat 7 Enhanced Thematic Mapper Plus and the Earth Observing-1 Advanced Land Imager over active lava flows

机译：Landsat 7增强型专题制图仪Plus和Earth-observation-1 Advanced Land Imager对活动熔岩流的响应比较

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摘要

Using near simultaneously acquired Landsat 7 Enhanced Thematic Mapper Plus (ETM+) and Earth Observing-1 Advanced Land Imager (ALI) data we assess the relative radiant responses over active lava flows from the Mt. Etna July/August 2001 flank eruption. By assessing the extent of saturation between the two instruments and using the dual-band method of extracting sub pixel thermal information, we show that the ALI represents an improvement over the ETM+ in the present ability to assess temperatures of hot active lava flows for a number of reasons. (1) The extra spectral channels provided by ALI compliment the current SWIR channels on ETM+ by providing a greater number of paired channel combinations for input into the dual-band method. Thus, dual-band temperature solutions can be determined for a greater range of lava flow types than previously possible using the two paired channel combinations available with the ETM+. (2) The ALI instrument is less susceptible than ETM+ to saturation within the SWIR, especially when using channels 5, 5p and 4p at wavelengths of 1.65, 1.25 and 0.87 μm respectively. (3) The greater radiometric sensitivity of the ALI 12 bit electronics coupled with a significantly higher signal to noise ratio aid in obtaining successful dual-band solutions.
机译：使用近乎同时获取的Landsat 7增强型专题制图仪增强版（ETM +）和“地球观测-1”高级陆地成像仪（ALI）数据，我们评估了来自山的活跃熔岩流的相对辐射响应。埃特纳火山2001年7月/ 8月侧翼爆发。通过评估两种仪器之间的饱和程度，并使用提取子像素热信息的双波段方法，我们表明ALI代表了ETM +在目前评估大量热熔岩流温度方面的能力的提高。原因。 （1）ALI提供的额外频谱信道通过提供更多数量的成对信道组合以输入双频方法，从而补充了ETM +上的当前SWIR信道。因此，与以前使用ETM +提供的两个成对通道组合可能得到的结果相比，可以确定更大范围的熔岩流类型的双波段温度解决方案。 （2）ALI仪器比ETM +更不容易受到SWIR饱和的影响，尤其是当分别使用波长分别为1.65、1.25和0.87μm的通道5、5p和4p时。 （3）ALI 12位电子设备具有更高的辐射敏感性，同时信噪比也明显更高，有助于获得成功的双频解决方案。

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