---
access_dt: ~
aliases:
  - context: dataset
    lexicon: nsidc
    term: oai:nsidc/GLA04
    url: http://nsidc.org/api/dataset/2/oai?verb=GetRecord&metadataPrefix=dif&identifier=oai:nsidc/GLA04
attributes: ~
cite_metadata: ~
cited_by: []
contributors:
  - display_name: 'Data Archive : National Snow & Ice Data Center Distributed Active Archive Center '
    href: http://52.38.26.42:8080/contributor/4440.yaml
    id: 4440
    organization:
      country_code: US
      display_name: National Snow & Ice Data Center Distributed Active Archive Center
      identifier: national-snow-ice-data-center-distributed-active-archive-center
      name: National Snow & Ice Data Center Distributed Active Archive Center
      organization_type_identifier: federal
      type: organization
      url: http://nsidc.org/daac
    organization_uri: /organization/national-snow-ice-data-center-distributed-active-archive-center
    person: {}
    person_id: ~
    person_uri: ~
    role_type_identifier: data_archive
    uri: /contributor/4440
data_qualifier: ~
description: 'The Geoscience Laser Altimeter System (GLAS) instrument on the Ice, Cloud, and Land Elevation Satellite (ICESat) provides global measurements of polar ice sheet elevation to discern changes in ice volume (mass balance) over time. Secondary objectives of GLAS are to measure sea ice roughness and thickness, cloud and atmospheric properties, land topography, vegetation canopy heights, ocean surface topography, and surface reflectivity. GLAS has a 1064 nm laser channel for surface altimetry and dense cloud heights, and a 532 nm lidar channel for the vertical distribution of clouds and aerosols. Level-1A global laser pointing data (GLA04) contain two orbits of attitude data from the spacecraft star tracker, instrument star tracker, gyro, and laser reference system, and other spacecraft attitude data required to calculate precise laser pointing. Data are in scaled integer binary format, big-endian (Unix) byte order, and are available via FTP.'
description_attribution: ~
display_name: GLAS/ICESat L1A Global Laser Pointing Data
doi: 10.5067/ICESAT/GLAS/DATA124
end_time: 2009-10-11T00:00:00
files: []
href: http://52.38.26.42:8080/dataset/nasa-nsidcdaac-gla04.yaml
identifier: nasa-nsidcdaac-gla04
instrument_measurements:
  - dataset_identifier: nasa-nsidcdaac-gla04
    display_name: ice-cloud-and-land-elevation-satellite/geoscience-laser-altimeter-system/nasa-nsidcdaac-gla04
    instrument_identifier: geoscience-laser-altimeter-system
    platform_identifier: ice-cloud-and-land-elevation-satellite
    type: instrument_measurement
lat_max: 86
lat_min: -86
lon_max: 180
lon_min: -180
name: GLAS/ICESat L1A Global Laser Pointing Data
native_id: GLA04
parents: []
processing_level: ~
publication_year: ~
references: []
release_dt: 2011-08-11T00:00:00
scale: ~
scope: ~
spatial_extent: ~
spatial_ref_sys: ~
spatial_res: ~
start_time: 2003-02-20T00:00:00
temporal_extent: ~
temporal_resolution: ~
type: dataset
uri: /dataset/nasa-nsidcdaac-gla04
url: http://nsidc.org/data/GLA04
variables: ~
version: ~
vertical_extent: ~