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Data Set ID:
ATL07
ATLAS/ICESat-2 L3A Sea Ice Height, Version 2
The data set (ATL07) contains along-track heights for sea ice and open water leads (at varying length scales) relative to the WGS84 ellipsoid (ITRF2014 reference frame) after adjustment for geoidal and tidal variations, and inverted barometer effects. Height statistics and apparent reflectance are also provided. The data were acquired by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Elevation Satellite-2 (ICESat-2) observatory.
There is a more recent version of these data.
Version Summary:
Changes for this version include:
- The parameters "tep_used_gt1_strong", "tep_used_gt1_weak", "tep_used_gt3_strong", and "tep_used_gt3_weak" (in /ancillary_data/fine_surface_finding/) are now filled with a value which shows which TEP was used (beam_3 or beam_5) to create the waveform table for the corresponding beam.
- The code now uses sea level pressure from ATL09 (instead of surface pressure), smoothed by averaging over 8 seconds.
- The default value for the number of photons collected for a fine track segment ( /ancillary_data/fine_surface_finding/n_s) has been updated to 150.
- The apparent surface reflectance (ASR) and background computations have been updated to use the proper return sensitivity value.
- The equilibrium tide is now read from ATL03. Values are averaged over a sea ice segment and written to the geophysical group (/gt[x]/sea_ice_segments/geophysical/).
- The code has been updated to use the equilibrium tide when there is a valid ocean tide correction to the photon heights.
COMPREHENSIVE Level of Service
Data: Data integrity and usability verified; data customization services available for select data
Documentation: Key metadata and comprehensive user guide available
User Support: Assistance with data access and usage; guidance on use of data in tools and data customization services
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Once you have logged in, you will be able to click and download files via a Web browser. There are also options for downloading via a command line or client. For more detailed instructions, please see Options Available for Bulk Downloading Data from HTTPS with Earthdata Login. Earthdata Search: This application allows you to search, visualize, and access data across thousands of Earth science data sets. Additional customization services are available for select data sets, including subsetting, reformatting, and reprojection. |
As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.
Kwok, R., G. Cunningham, T. Markus, D. Hancock, J. H. Morison, S. P. Palm, S. L. Farrell, A. Ivanoff, J. Wimert, and the ICESat-2 Science Team. 2019. ATLAS/ICESat-2 L3A Sea Ice Height, Version 2. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.5067/ATLAS/ATL07.002. [Date Accessed].How To
Programmatic Data Access Guide
Data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) can be accessed directly from our HTTPS file system or through our Application Programming Interface (API). Our API offers you the ability to order data using specific temporal and spatial filters... read more
ICESat, IceBridge, and ICESat-2: A primer on data access across the three missions
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Overview
The NASA ICESat, Operation IceBridge, and... read more
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Search, order, and customize NSIDC DAAC data with NASA Earthdata Search
NASA Earthdata Search is a map-based interface where a user can search for Earth science data, filter results based on spatial and temporal constraints, and order data with customizations including re-formatting, re-projecting, and spatial and parameter subsetting. Thousands of Earth science data... read more
Filter and order from a data set web page
Many NSIDC data set web pages provide the ability to search and filter data with spatial and temporal contstraints using a map-based interface. This article outlines how to order NSIDC DAAC data using advanced searching and filtering.
Step 1: Go to a data set web page
This article will use the... read more
FAQ
What subsetting and reformatting services are available for ICESat-2 data?
The following table describes the subsetting and reformatting services that are currently available for ICESat-2 data via the NASA Earthdata Search tool, along with ... read more
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