## Polar Products
\begin{table}
\begin{tabular}{p{113.8 pt} p{113.8 pt} p{113.8 pt}} \hline
**Product Name** & **Description** & **URL** \\ \hline Antarctic Peninsula & Derived from ASTER GDEM and posted to 100-m spacing, this DEM has been significantly improved for snow and ice covered regions. Using a new smoothing method [119], this DEM achieves a mean elevation difference of \(-4\pm 25\) m when compared to ICESat. & [[http://nsidc.org/data/nsidc-0516](http://nsidc.org/data/nsidc-0516)]([http://nsidc.org/data/nsidc-0516](http://nsidc.org/data/nsidc-0516)) [120] \\ \multirow{2}{*}{DEM} & This data set provides a 1-km resolution DEM of Antarctica by combining measurements from the ERS-1 Satellite Radar and ICESat Laser & [[http://nsidc.org/data/nsidc-0422](http://nsidc.org/data/nsidc-0422)]([http://nsidc.org/data/nsidc-0422](http://nsidc.org/data/nsidc-0422)) [126] \\ \multirow{2}{*}{Altimetry} & System from 2003 to 2008 [124, 125]. Data are provided as two gridded binary files and two ENVI header files viewable using ENVI or other similar software packages. & \\ \multirow{2}{*}{Bedmap2} & Bedmap2 is a suite of gridded products describing surface elevation, ice-thickness and the sea floor and subglacial bed elevation of the Antarctic south of 60\({}^{\circ}\)S. & \\ \multirow{2}{*}{BYU Antarctic Iceberg Database} & Using data from six different active microwave scatterometers for 1978 and 1992–present, this database brings together latitude and longitude coordinates for icebergs initially identified by the National Ice Center [133]. & \\ \hline Circumolar Arctic & The CAVM defines the spatial extent of dominant vegetation in Vegetation Map (CAVM) & [[http://nsidc.org/data/ggd639](http://nsidc.org/data/ggd639)]([http://nsidc.org/data/ggd639](http://nsidc.org/data/ggd639)) (e.g., [134]) \\ \multirow{2}{*}{Cryosat-2 \multirow{2}{*}{Data}} & Mapped vegetation extends south to the tree line, which varies with longitude. Spatial coverage is approximately 60\({}^{\circ}\)N to 90\({}^{\circ}\)N. & \\ \hline Cryosat-2 Elevation & Elevation profiles derived from radar altimetry, in \"Level 2\" products, as well as more complex raw data. See the ESA website and the appropriate literature for specific applications (_i.e._, sea ice, ice sheets, _etc._). & [[https://enft.esa.int/web/guest/mis](https://enft.esa.int/web/guest/mis)]([https://enft.esa.int/web/guest/mis](https://enft.esa.int/web/guest/mis)) \\ \multirow{2}{*}{Frozen Ground Maps} & Various permafrost extent, soil temperature and ground ice maps are available for regions, such as China, Russia, Mongolia, Canada, Alaska and the Circumarctic region. & \\ \multirow{2}{*}{ Glacier Photograph Collection} & An online collection of more than 12,000 photographs of glaciers. & [[https://nsidc.org/data/docs/noaa/g](https://nsidc.org/data/docs/noaa/g)]([https://nsidc.org/data/docs/noaa/g](https://nsidc.org/data/docs/noaa/g)) 00472_glacier_photos/ [21] \\  & Largely comprised of images from the Rocky Mountains, the Pacific Northwest, Alaska and Greenland, it also includes select images from Europe and South America. Updates to the dataset are ongoing, and the photos are searchable via a web interface. & \\ \hline GLAS/ICESat Ice Sheet & These DEMs of Antarctica (500-m posting) and Greenland (1-km posting) are derived from GLAS/ICESat laser altimetry profile data collected February 2003, to June 2005, providing greater latitudinal extent and fewer slope-related effects than radar altimetry alone. Both DEMs are in polar stereographic grids; the grids cover all of Antarctica north of 86\({}^{\circ}\) S and all of Greenland south of 83\({}^{\circ}\)N. Elevations for both ice sheets are reported as centimeters above the datums, relative to both the WGS84 Ellipsoid and the EGM96 Geoid. Ancillary files include data quality maps of interpolation distance, as well as ENVI header files. & \\ \hline \end{tabular}
\end{table}