Although the ATLAS instrument is optimized to measure changes in polar sea ice and land ice, as a global mission, ICESat-2 collects elevation data over all surfaces, from pole to pole.  The table below summarizes the mission Standard Data Products, which are available through the National Snow and Ice Data Center.  The low-level data products are developed through the ICESat-2 project science office.  The products include ATL01 and 02 (where ATLAS times of flight are computed and corrected for temperature and voltage effects) and end with ATL03, which provides a latitude, longitude and elevation for each photon. Beyond that, surface-specific data products are developed by experts into those disciplines, and include products for land ice, sea ice, the atmosphere, vegetation and land, oceans and inland water.

Overview of the operational ICESat-2 data products.

The left column contains the product indicator name.
ATL00 Telemetry Data Raw ATLAS telemetry in packet format
ATL01 Reformatted Telemetry Parsed, partially reformatted into HDF5, generated daily, segmented into several minute granules.
ATL02 Science Unit Converted Telemetry

Photon time of flight, corrected for instrument effects. Includes all photons, pointing data, spacecraft position, housekeeping data, engineering data, and raw atmospheric profiles, segmented into several minute granules.

ATL03 Global Geolocated Photon Data

Precise latitude, longitude and elevation for every received photon, arranged by beam in the along-track direction. Photons classified by signal vs. background, as well as by surface type (land ice, sea ice, land, ocean), including all geophysical corrections (e.g. Earth tides, atmospheric delay, etc…). Segmented into several minute granules.

ATL04

Uncalibrated Backscatter Profiles

Along-track atmospheric backscatter data, 25 times per second. Includes calibration coefficients for polar regions. Segmented into several minute granules.

ATL06

Land Ice Elevation

Surface height for each beam with along- and across-track slopes calculated for each beam pair. Posted at 40m along-track; segmented into several minute granules.
ATL07 Arctic/Antarctic Sea Ice Elevation Height of sea ice and open water leads at varying length scale based on returned photon rate for each beam presented along-track
ATL08 Land Water Vegetation Elevation

Height of ground including canopy surface posted at variable length scales relative to signal level, for each beam presented along-track. Where data permits include canopy height, canopy cover percentage, surface slope and roughness, and apparent reflectance.

ATL09

Calibrated Backscatter and Cloud Characteristics

Along-track cloud and other significant atmosphere layer heights, blowing snow, integrated backscatter, and optical depth.

ATL10

Arctic/Antarctic Sea Ice Freeboard

Estimate of sea ice freeboard over specific spatial scales using all available sea surface height measurements. Contains statistics of sea surface and sea ice heights.

ATL11

Antarctica / Greenland Ice Sheet H(t) Series

Time series of height at points on the ice sheet, calculated based on repeat tracks and/or cross-overs.

ATL12

Ocean Elevation

Surface height at specific length scale. Where data permits include estimates of height distribution, roughness, surface slope, and apparent reflectance.

ATL13

Inland Water Height

Along-track inland and near shore water surface height distribution within water mask.  Where data permit, include roughness, slope and aspect

ATL14

Antarctica / Greenland Ice Sheet H(t) Gridded

Height maps of each ice sheet for each year based on all available elevation data.

ATL15

Antarctica / Greenland Ice Sheet dh/dt Gridded

Height change maps for each ice sheet, for each mission year, and for the whole mission.

ATL16

ATLAS Atmosphere Weekly

Polar cloud fraction, blowing snow frequency, ground detection frequency.

ATL17

ATLAS Atmosphere Monthly

Polar cloud fraction, blowing snow frequency, ground detection frequency.

ATL18

Land/Canopy Gridded

Gridded ground surface height, canopy height, and canopy cover estimates.

ATL19

Mean Sea Surface (MSS)

Gridded ocean height product.

ATL20

Arctic / Antarctic Gridded Sea Ice Freeboard

Gridded sea ice freeboard.

ATL21

Arctic/Antarctic Gridded Sea Surface Height w/in Sea Ice

Gridded monthly sea surface height inside the sea ice cover.

 

OF NOTE

The Algorithm Theoretical Basis Documents (ATBDs) for all the products are currently in development and will be posted here about 6 months prior to launch.

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