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| DOI：10.13522/j.cnki.ggps.2017.0266 |
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| Estimating the Concentration of Dissolved Solid in the Wuliangsuhai Lake Based on the Landsat-8 OLI Images |
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A Runa, QING Song, BAO Yuhai
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College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, China;Inner Mongolian Key Laboratory of Remote Sensing and Geographical Information System, Hohhot 010022, China
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| Abstract: |
| 【Objective】 The objective of this paper is to investigate the distribution of total dissolved solids (TDS) in the Wuliangsuhai Lake in attempts to provide baseline data for quality assessment of its water environment.【Method】 We developed and tested a multi-linear regression model based on the remote sensing reflectance and the TDS concentration measured in 2013 and 2015 in the lake. The root mean square error of the model was 0.455 g/L with R2 being 0.594 and an average relative error of 13%. Error sensitivity analysis and suitability analysis reveled that this regression model was accurate to retrieve the TDS in the lake. The model was used with the Landsat-8 OLI data to calculate the spatiotemporal distribution of TDS in the Lake. 【Result】 There was no noticeable temporal cycle in the TDS concentration and the TDS was low in center of the lake. The errors of the model were high for the northern and southern lake, as well as the area along the east coast due to the effect of bottom reflectance, algal blooms and submerged vegetation. 【Conclusion】 Overall, the model worked well and has implications in using remote sensing technology to assess surface water quality. |
| Key words: total dissolved solid; OLI; retrieval; regression model; Wuliangsuhai Lake |
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