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Distribution of blue ice areas in Antarctica derived from Landsat ETM+ and Modis images Data DOI: https://doi.org/10.15784/601742 Cite as Hui, F., & Scambos, T. (2023) "Distribution of blue ice areas in Antarctica derived from Landsat ETM+ and Modis images" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601742. Abstract Blue-ice areas (BIAs) and their geographical distribution in Antarctica were mapped using Landsat-7 ETM+ images with 15 m spatial resolution obtained during the 1999–2003 austral summers and covering the area north of 82.5° S, and a snow grain-size image of the MODIS-based Mosaic of Antarctica (MOA) dataset with 125 m grid spacing acquired during the 2003/04 austral summer from 82.5°S to the South Pole. A map of BIAs was created with algorithms of thresholds based on band ratio and reflectance for ETM+ data and thresholds based on snow grain size for the MOA dataset. The underlying principle is that blue ice can be separated from snow or rock by their spectral discrepancies and by different grain sizes of snow and ice. We estimate the total area of BIAs in Antarctica during the data acquisition period is 234 549 km2, or 1.67% of the area of the continent. Blue ice is scattered widely over the continent but is generally located in coastal or mountainous regions. The BIA dataset presented in this study is the first map covering the entire Antarctic continent sourced solely from ETM+ and MODIS data. Support by National Natural Science Foundation of China (grant No. 41106157) and NASA grant NNX10AL42G (nsidc0549_hui_V0). Creator(s): Hui, Fengming; Scambos, Ted Date Created: 2023-10-13 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: -180, East: 180, South: -90, North: -60 Temporal Extent(s) Start: 1999-01-01 - End: 2004-04-30 Version: 1 References Hui, F., Ci, T., Cheng, X., Scambo, T.A., Liu, Y., Zhang, Y., Chi, Z., Huang, H., Wang, X., Wang, F. and Zhao, C., 2014. Mapping blue-ice areas in Antarctica using ETM+ and MODIS data. Annals of Glaciology, 55(66), pp.129-137. (doi:10.3189/2014AoG66A069 ) Keywords Antarctica Blue Ice GIS LANDSAT MODIS Remote Sensing Snow/ice