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Hydrological Sciences-Journal- des Sciences HydrologUpies,38,2,4/1993 147 DISCUSSION Correlation of turbidity with Indian Remote Sensing Satellite-1A data*
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| Abstract | Remote sensing applications in hydrology are becoming more and more widespread. Choubey (1992) describes an interesting application in surface water hydrology: the correlation of turbidity in the surface water of a reservoir with remote sensing data. Choubey's paper discusses the first application of this type with the Indian Remote Sensing Satellite-1A (IRS-1A). The multispectral digital data cover the Tawa reservoir region. Water samples were collected concurrent with the satellite overpass. Good correlation is found between the turbidity and suspended solids on the one hand, and the satellite recorded pixel values on the other hand. Choubey follows the same procedure as Khorram & Cheshire (1985). This procedure is certainly sufficient for a feasibility study, and this is the important merit of Choubey's paper, but it does not lead to reproducible results that can be applied to other satellite images. In this discussion, additional image processing techniques and the consequences for Choubey's results are investigated. The techniques are performed on the mean pixel values as they appear in the original paper. IMAGE PREPROCESSING The first image processing consists of an elimination of pixels near the landwater interface. Elimination of these border pixels prevents contamination of the sensor's signal in pixels partly covering land and, at least partly, the sensor's hysteresis and spurious effects at the interface (see, for example, Fusco & Blonda, 1986; Begni et al, 1986). Care should also be taken of the influence of the reflection by the bottom of the rivers and reservoir: pixels where the water level is too low should be eliminated as well. At least some knowledge about water depths would be |
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| Subject Keyword | Important Merit Surface Water Hydrology Khorram Cheshire Satellite Overpass Water Depth Reproducible Result Indian Remote Sensing Satellite-1a Data Multispectral Digital Data Feasibility Study Tawa Reservoir Region Hydrological Sciences-journal De Science Hydrologupies Water Sample Surface Water Indian Remote Sensing Satellite-1a Suspended Solid Good Correlation Landwater Interface Water Level First Application Border Pixel Prevents Contamination First Image Processing Original Paper Fusco Blonda Satellite Image Additional Image Processing Technique Discussion Correlation Pixel Value Interesting Application Spurious Effect Mean Pixel Value |
| Content Type | Text |
