---
access_dt: ~
aliases:
  - context: dataset
    lexicon: nsidc
    term: oai:nsidc/GLA07
    url: http://nsidc.org/api/dataset/2/oai?verb=GetRecord&metadataPrefix=dif&identifier=oai:nsidc/GLA07
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-1B global backscatter data (GLA07) are provided at full instrument resolution. The product includes full 532 nm (41.1 to -1.0 km) and 1064 nm (20 to -1 km) calibrated attenuated backscatter profiles at 5 times per second, and from 10 to -1 km, at 40 times per second for both channels. Also included are calibration coefficient values and molecular backscatter profiles at once per second. Data granules contain approximately 190 minutes (2 orbits) of data. Each data granule has an associated browse product that users can quickly peruse to determine the general quality of the data in the granule. Browse products consist of image plots of key parameters and statistics. Data are in scaled integer binary format, big-endian (Unix) byte order, and are available via FTP.'
description_attribution: ~
display_name: GLAS/ICESat L1B Global Backscatter Data
doi: 10.5067/ICESAT/GLAS/DATA127
end_time: 2009-10-11T00:00:00
files: []
href: http://52.38.26.42:8080/dataset/nasa-nsidcdaac-gla07.yaml
identifier: nasa-nsidcdaac-gla07
instrument_measurements:
  - dataset_identifier: nasa-nsidcdaac-gla07
    display_name: ice-cloud-and-land-elevation-satellite/geoscience-laser-altimeter-system/nasa-nsidcdaac-gla07
    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 L1B Global Backscatter Data
native_id: GLA07
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-gla07
url: http://nsidc.org/data/GLA07
variables: ~
version: ~
vertical_extent: ~