This paper proposes an estimating method of snow reflectance based on Landsat-5 Thematic Mapper (TM) data (June 21 1988) and a 30-meter resolution digital terrain model that correct and adjust the problems mentioned above. A radiative transfert model (LOWTRAN-7) in conjunction with radiosonde data was used to eliminate the radiometric distortion on the signal created by the presence of the atmosphere. A software package called PRODEM was use to model the terrain shape from the digital elevation data. PRODEM was also very helpful for integrating the digital elevation model to the digital analysis of the remote sensing data. The results were compare to a series of data extracted from the literature. The estimated values of reflectance and albedo are in good correspondence with the values in the literature. However, we observed various problems to estimate the reflectance and albedo of surfaces that present extreme topographic characteristics. First, we think that those problems can be related to an under evaluation of the diffuse component of the incident radiation. Second, it can also be attributed to an imperfect match between the satellite data and the incident solar radiation image. Also, the differences between the estimated and the observed snow reflectance values (literature) can be imputed coarsely to the approximation of the different model constituents and the spatial and temporal correspondence of satellite and in situ data. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:uottawa.ca/oai:ruor.uottawa.ca:10393/6579 |
| Date | January 1994 |
| Creators | Crevier, Yves. |
| Contributors | Duguay, Claude, |
| Publisher | University of Ottawa (Canada) |
| Source Sets | Université d’Ottawa |
| Detected Language | English |
| Type | Thesis |
| Format | 185 p. |
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