ATLAS/ICESat-2 L3A Sea Ice Height, Version 2
Data set id:
ATL07
DOI: 10.5067/ATLAS/ATL07.002
There is a more recent version of these data.
Version Summary
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.
Overview
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.
Parameter(s):
SEA ICE ELEVATION
Platform(s):
ICESat-2
Sensor(s):
ATLAS
Data Format(s):
HDF5
Temporal Coverage:
- 14 October 2018 to 15 November 2019
Temporal Resolution:
- 91 day
Spatial Resolution:
- Not Specified
Spatial Reference System(s):
- WGS 84EPSG:4326
Spatial Coverage:
- N:90S:-90E:180W:-180
Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.
Data Access & Tools
This data set has been retired. There is a more recent version of these data.
Documentation
User Guide
ATBDs
General Resources
Product Specification Documents
Help Articles
General Questions & FAQs
This short article describes the customization services available for ICESat-2 data using Earthdata Search.
The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is migrating its primary data access from its legacy, on-premises archive to the NASA Earthdata Cloud.
How to Articles
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This quickstart guide will walk you through the essential steps to start using the Harmony API to request subsetted files with specific spatial and temporal filters applied for select data sets.
To convert HDF5 files into binary format you will need to use the h5dump utility, which is part of the HDF5 distribution available from the HDF Group. How you install HDF5 depends on your operating system.
Learn the basic steps for using OpenAltimetry to browse and download ICESat-2 data products.
The NASA Earthdata Cloud is the NASA cloud-based archive of Earth observations. It is hosted by Amazon Web Services (AWS). Learn how to find and access NSIDC DAAC data directly in the cloud.
This article highlights the NSIDC DAAC data sets available with customization options and outlines a workflow for searching, ordering, and customizing data in NASA Earthdata Search. This approach is ideal for users who want to download data to their local machine.