STUDY ON SPATIAL-TEMPORAL VARIATION OF HONG LAKE BASED ON VIIRS AND MODIS IMAGES

Hong Lake is the largest lake in Hubei Province. With the increase of Hong Lake economic activity, the area, spatial location and shape of Hong Lake have changed greatly in the past. In this paper, we used the images, which is from the visible infrared imaging radiometer (VIIRS). First, we selected the images of Hong Lake waters on December 6, 2016 and December 26, 2015. Then we extracted the water bodies by the single-band method, spectral relationship method, normalized difference water index (<i>NDWI</i>) were used, and the effect-s were compared. Second, the images of Hong Lake waters in summer and winter were selected from 2012 to 2016, respectively. Last, The <i>NDWI</i> was used to extract the water body and compared with the MODIS image extraction effect in the same period. As a result of the vegetation around Hong Lake, the water is extracted by <i>NDWI</i> and normalized difference vegetation index (<i>NDVI</i>). It is found that for the VIIRS image, the <i>NDWI</i> is the best in the water extraction of Hong Lake. The <i>NDVI</i> + <i>NDWI</i> method is beneficial to the extraction of water covered with aquatic plants. VIIRS image extraction is better than MODIS image. In addition, from the study of VIIRS and MODIS to Hong Lake waters in the five years of water extraction and area calculation, 2012&ndash;2016 period, Hong Lake’s average area of 348.213&thinsp;km² in flood season, in dry season average area of 349.163&thinsp;km². The largest area for the 2012 flood season 389.751&thinsp;km², the smallest area of 2016 flood season 306.177&thinsp;km². Overall, Hong Lake’s area changes little.

Abstract licence: CC BY

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