| Abstract: | Spectral emissivity can be uniquely determined from radiance measurements if the object can be observed at two different temperatures. The advantage of this approach is that the spectral emissivity is determined without a priori assumptions about spectral shape. Because the different temperatures are obtained by observing the scene at two times in the diurnal cycle (optimally after midday and midnight), the method assumes that emissivity is temporally invariant. This is valid for rocks and dry soils, not well established for vegetation, and not true when changes in soil moisture occur between the measurements. Accurate image registration and satisfactory signal:noise are critical factors that limit extensive use of this method. ?? 1992. |
| Genre: | Article |
| ProdID: | 70017003 |
| Citation Author: | Watson, K. |
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| Citation End Page: | 121 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Remote Sensing of Environment |
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| Citation Number Of Pages: | 5 |
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| Citation Search Results Text: | Two-temperature method for measuring emissivity; 1992; Article; Journal; Remote Sensing of Environment; Watson, K. |
| Citation Start Page: | 117 |
| Citation Volume: | 42 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Two-temperature method for measuring emissivity; 1992; Article; Journal; Remote Sensing of Environment; Watson, K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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