Improved Radiometric and Spatial Capabilities of the Coastal Zone Imager Onboard Chinese HY-1C Satellite for Inland Lakes

	Improved Radiometric and Spatial Capabilities of the Coastal Zone Imager Onboard Chinese HY-1C Satellite for Inland Lakes
	Cao, Zhigang; Ma, Ronghua; Liu, Jianqiang; Ding, Jing
刊名	IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
	2021
卷号	18 期号:2 页码:193-197
英文摘要	The coastal zone imager (CZI) onboard HY-1C satellite provides a new data source to monitor the lake environments. Here, we provided a preliminary evaluation for the applications of CZI on inland lakes and a comparison with the in situ, Landsat-8 operational land imager (OLI), and Sentinel-2 multispectral instrument (MSI) measurements. First, the in-orbit signal-to-noise ratios (SNRs) were estimated based on homogenous ocean pixels. SNRs of CZI reached similar to 200:1 in the visible bands and similar to 150:1 at the near-infrared bands, which are comparable with the OLI and slightly higher than those of the MSI. Then, the performance of 6SV and fast line-of-sight atmospheric analysis of hypercubes (FLAASH) models on the retrievals of remote sensing reflectance (R-rs) from CZI measurements was evaluated. 6SV-derived R-rs showed higher accuracy than that of FLAASH, validated by the synchronous in situ (R-2 similar or equal to 0.50, absolute percent difference (APD) similar or equal to 20%) and OLI-derived R-rs (R-2 similar or equal to 0.75, APD similar or equal to 5%). Finally, the abilities of CZI to observe cyanobacterial bloom, suspended particular matter (SPM), and chlorophyll-a (Chla) were assessed. CZI-derived, the area of cyanobacterial bloom and SPM, showed good agreements with the results yielded by the OLI and MSI data on May 24, 2019, in Lake Taihu (R-2 = 0.68, root-mean-square error (RMSE) = 9.68 mg/L, APD = 13.52% for SPM). While CZI only has four wide bands, Chla derived by CZI using an empirical algorithm was relatively consistent with MSI-derived values. CZI demonstrated a decent performance in monitoring the environments of large lakes, and it is expected to add the bands for atmospheric correction and further works in the small-medium lakes in the future.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20639]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Cao, Zhigang,Ma, Ronghua,Liu, Jianqiang,et al. Improved Radiometric and Spatial Capabilities of the Coastal Zone Imager Onboard Chinese HY-1C Satellite for Inland Lakes[J]. IEEE GEOSCIENCE AND REMOTE SENSING LETTERS,2021,18(2):193-197.
APA	Cao, Zhigang,Ma, Ronghua,Liu, Jianqiang,&Ding, Jing.(2021).Improved Radiometric and Spatial Capabilities of the Coastal Zone Imager Onboard Chinese HY-1C Satellite for Inland Lakes.IEEE GEOSCIENCE AND REMOTE SENSING LETTERS,18(2),193-197.
MLA	Cao, Zhigang,et al."Improved Radiometric and Spatial Capabilities of the Coastal Zone Imager Onboard Chinese HY-1C Satellite for Inland Lakes".IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 18.2(2021):193-197.