GLAH06 Level-1B Global Elevation is a product that is analogous to the geodetic data records distributed for radar altimetry missions. It contains elevations previously corrected for tides, atmospheric delays, and surface characteristics within the footprint. Elevation is calculated using the ice sheet parameterization. Additional information allows the user to calculate an elevation based on land, sea ice, or ocean algorithms. Each data granule has an associated browse product.
Type: EGI - No ProcessingDescription: Using this service, 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). This API offers you the ability to programmatically order and bulk-download data using temporal and spatial filters without the need to script against NSIDC's data directory structure. This may be valuable if you are interested in incorporating data access commands into your analysis or visualization code.
Type: NOT PROVIDEDDescription: The IceFlow Library, API and Jupyter Notebooks harmonize pre-IceBridge, IceBridge, ICESat/GLAS and ICESat-2 datasets into similar formats and applies any necessary geophysical corrections for users to immediately access and compare decades of data. The IceFlow Notebooks also provide users with a map-based customization and download widget, API code examples, and other data visualization options.
Type: Web User InterfaceDescription: The ICESat/GLAS Date Conversion Tool includes several options for obtaining information related to laser track start time. To use the tool, use only one of the conversion options at a time. For example, to find time data for Day 236 of Year 2006, use the third option below and fill in the Day of Year and Year fields, and click Convert.
Type: Web User InterfaceDescription: The ICESat/GLAS Track Conversion Tool provides starting dates and times and related information for a Track for a specified laser period or for all laser periods. Enter the ICESat track number in the Track field, and optionally enter the laser name in the Laser Period field. The default Laser Period is ALL. Click Convert. The resulting Track Conversion Table lists starting dates and time and other related track information.
Type: Downloadable ToolDescription: HDFView is a visual tool for browsing and editing HDF4 and HDF5 files. Using HDFView, you can view a file hierarchy in a tree structure, create new files, add or delete groups and datasets, view and modify the content of a dataset, and add, delete and modify attributes.
Type: Downloadable ToolDescription: Panoply is a desktop application that interactively plots georeferenced and other arrays encoded in the netCDF, HDF and GRIB file formats. With Panoply you can:
Slice and plot geo-referenced latitude-longitude, latitude-vertical, longitude-vertical, time-latitude or time-vertical arrays from larger multidimensional variables; slice and plot "generic" 2D arrays from larger multidimensional variables; slice 1D arrays from larger multidimensional variables and create line plots; combine two geo-referenced arrays in one plot by differencing, summing or averaging; plot lon-lat data on a global or regional map using any of over 100 map projections or make a zonal average line plot; overlay continent outlines or masks on lon-lat map plots; use any of numerous color tables for the scale colorbar, or apply your own custom ACT, CPT, or RGB color table.
INTDescription: A count of the number of exact repeats of this reference orbit
STRINGDescription: Universally unique identifier for this data product's files
INTDescription: The number of times that we have returned to a specific reference orbit.
INTDescription: Flag word that indicates which redundant units (laser, detector, oscillator) of the GLAS instrument are in operation
DATEDescription: The date that corresponds to the first valid Instrument_State. There are a maximum of two per granule
TIMEDescription: The time that corresponds to the first valid Instrument_State. There are a maximum of two per granule
STRINGDescription: Status word that states what type of orbit was used during processing of the data for the granule. It specifies the models used in the orbit determination program. This provides an indication of the quality of the orbits being applied to the data.
FLOATDescription: Percent of data for this granule that had a detected ground return of the transmitted laser pulse.
INTDescription: The additive calibration correction in millimeters to apply to range based on the science team cal/val activities.
DATEDescription: The date that corresponds to the first valid Range_Bias. There are a maximum of two per granule.
TIMEDescription: The time that corresponds to the first valid Range_Bias. There are a maximum of two per granule.
INTDescription: Assigned number for which exact orbital elements describe the exact repeat orbit pattern.
INTDescription: Integer number within GLAS coverage scheme in which granule data ends.
INTDescription: Integer number within GLAS coverage scheme in which granule data starts.
INTDescription: Number which represents the GLAS path number.
INTDescription: The time tag error determined by the calibration team that was added to the time tags to compute the true time of data as provided on the granule.
DATEDescription: The date that corresponds to the first valid Timing_Bias. There are a maximum of two per granule.
TIMEDescription: The time that corresponds to the first valid Timing_Bias. There are a maximum of two per granule.
FLOATDescription: This is the ratio of the true time for a one second oscilator tick to nominal one
DATEDescription: The date that corresponds to the first valid Timing_Drift. There are a maximum of two per granule.
TIMEDescription: The time that corresponds to the first valid Timing_Drift. There are a maximum of two per granule.
INTDescription: The unique number assigned for each repeat ground track (one orbit) of the reference orbit
INTDescription: Number assigned for the specific latitude segment (1 = +50 to +50, 2 = +50 to -50, 3 = -50 to -50, 4 = -50 to +50) of the track for the data
STRINGDescription: Digital object identifier that uniquely identifies this data product
STRINGDescription: URL of the digital object identifier resolving authority
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NASA NSIDC DAAC
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado