This dataset includes annual mosaics of Antarctic ice velocity derived from Landsat 8 images between December, 2013 and April, 2019, which was updated in 2020 in order to produce multi-year annual ice velocity mosaics and improve the quality of products including non-local means (NLM) filter, and absolute calibration using rock outcrops data. The resulting Version 2 of the mosaics offer reduced local errors, improved spatial resolution as described in the README file.

File naming and required software

The 105×105-m gridded ice velocities for all of Antarctica are stored in a 16-bit integer GeoTIFF file format under a polar stereographic projection with a true latitude at 71 degree. The gridded ice velocity has been equally divided into 4 subsets in the X and Y directions in consideration of file size and computer processing speed (see Fig. S1). Note that file sizes have been kept at 1 Gigabyte for user friendliness and easy downloading. Each file contains three bands that show velocity vector components in both the X-direction and Y-direction and a gridded error map of the ice velocity. The structure of the ice velocity filenames is Velocity_l8_*begin date*_*end date*_*subset*_*XY* _*component*_v2.tif, where Velocity represents ice velocity data and l8 indicates the L8 satellite from which images are used to produce the ice velocity map. *begin date* is start date of the images that contributed to mosaic in format of ‘yyyyddd’, which ‘yyyy’ is four-digit start year and ‘ddd’ is three-digit day of start year, and *end date* is end date of images used in same format with start date. *subset* shows whether the ice velocity file has been cropped due to considerations of file size and computer processing speed, and *XY* indicates the relative coordinates among all files, where X is the column number starting with one and Y is the row number starting with one. *component* shows the components of velocity vectors by use of ‘vx’ and ‘vy’, which represents the easting and northing components. Furthermore, the annual mosaics of ice velocity are also provided. The naming convention is the same as the description mentioned above.
For count maps
The count maps of number of ice velocity measurements for valid displacement maps stacked for ice velocity mosaics, and are stored in 16-bit integer GeoTIFF files (Fig. S2). These files also have the same file structure and projection as the gridded ice velocity maps. The naming convention of the count maps is Countimage_l8_*begin date*_*end date*_*subset*_*XY*.tif, which has the same naming convention as the ice velocity maps, except for “Countimage”,

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Cite as:

Shen, Q. (2020). Continent-wide annual ice velocity maps in Antarctic ice sheet between 2013 and 2019. A Big Earth Data Platform for Three Poles, DOI: 10.1594/PANGAEA.908845. (Download the reference： RIS | Bibtex )

Related Literatures:

1. Shen, Q., Wang, H.S., Shum, C.K., Jiang, L.M., Hsu, H.T., Dong, J.L., Mao, S., Gao, F. (in review). Present-day high-resolution ice velocity map of the Antarctic ice sheet. Earth System Science Data Discussions, 1-25, https://doi.org/10.5194/essd-2018-149( View Details | Bibtex)

2. Shen, Q., Wang, H., & Shum, C.K., et al. (2018). Recent high-resolution Antarctic ice velocity maps reveal increased mass loss in Wilkes Land, East Antarctica. Sci Rep 8, 4477. https://doi.org/10.1038/s41598-018-22765-0( View Details | Download | Bibtex)

Using this data, the data citation is required to be referenced and the related literatures are suggested to be cited.

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