Reservoir capacity estimation of Singoor reservoir,India, by per-pixel and sub-pixel processing of multi-date satellite images |
| |
| Authors: | Veeraraghu S Jeyakanthan Shanmugam Sanjeevi |
| |
| Institution: | 1. Deltaic Regional Centre , National Institute of Hydrology , Siddartha Nagar, Kakinada, 533003, Andhra Pradesh, India jeyakanthan05@gmail.com;3. Department of Geology , Anna University , Chennai, 600025, India |
| |
| Abstract: | Traditional approaches of image classification, such as maximum likelihood and the band thresholding method, involve the per-pixel approach to delineate the water spread area of a reservoir. One of the limitations of these approaches is that the pixels representing the reservoir border, containing a mixture of water, soil and vegetation, are classified entirely as water, thereby resulting in inaccurate estimates of the water spread area. To compute the water spread area accurately, the sub-pixel approach has been used in this study. The water spread areas extracted using per-pixel and sub-pixel approaches from IRS-1D and P6 satellite image data were in turn used to quantify the capacity of the Singoor reservoir, Andhra Pradesh, India. The estimated capacity of the reservoir using the per-pixel and sub-pixel approaches was 727.75 Mm3 and 716.11 Mm3, respectively. The validation shows that the sub-pixel approach produced much less error (1.08%) than the per-pixel based approach (3.14%). |
| |
| Keywords: | reservoir water spread area capacity estimation sub-pixel approach |
|
|
