asas_Not provided

Advanced Solid-state Array Spectroradiometer (ASAS)

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  • Abstract
    The Advanced Solid-state Array Spectroradiometer (ASAS) data collection contains data collected by the ASAS sensor flown aboard NASA aircraft. A fundamental use of ASAS data is to characterize and understand the directional variability in solar energy scattered by various land surface cover types (e.g.,crops, forests, prairie grass, snow, or bare soil). The sensor's Bidirectional Reflectance Distribution Function determines the variation in the reflectance of a surface as a function of both the view zenith angle and solar illumination angle. The ASAS sensor is a hyperspectral, multiangle, airborne remote sensing instrument maintained and operated by the Laboratory for Terrestrial Physics at NASA's Goddard Space Flight Center in Greenbelt, Maryland. The ASAS instrument is mounted on the underside of either NASA C-130 or NASA P-3 aircraft and is capable of off-nadir pointing from approximately 70 degrees forward to 55 degrees aft along the direction of flight. The aircraft is flown at an altitude of 5000 - 6000 meters (approximately 16,000 - 20,000 ft.). Data in the ASAS collection primarily cover areas over the continental United States, but some ASAS data are also available over areas in Canada and western Africa. The ASAS data were collected between 1988 and 1994.
  • Purpose
    Some applications of ASAS data include validating forest canopy reflectance models, estimating biophysical parameters used in forest ecosystem models, deriving vegetation algorithms, and retrieving information on atmospheric properties.

Data Identification Fields:

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    Processing Level

    Not provided

    Quality
    Collection Progress

    In Work

    Use Constraints
    There is no guarantee of warranty concerning the accuracy of these data. Users should be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data set is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data set, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
    Access Constraints

    None

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • LAND SURFACE
    • EROSION/SEDIMENTATION
    • EROSION
    • BIDIRECTIONAL REFLECTANCE DISTRIBUTION
    • EARTH SCIENCE
    • LAND SURFACE
    • LAND USE/LAND COVER
    • LAND USE/LAND COVER CLASSIFICATION
    • BIDIRECTIONAL REFLECTANCE DISTRIBUTION
    • EARTH SCIENCE
    • LAND SURFACE
    • LANDSCAPE
    • REFORESTATION
    • BIDIRECTIONAL REFLECTANCE DISTRIBUTION
    • EARTH SCIENCE
    • LAND SURFACE
    • SURFACE RADIATIVE PROPERTIES
    • ALBEDO
    • BIDIRECTIONAL REFLECTANCE DISTRIBUTION
    • EARTH SCIENCE
    • LAND SURFACE
    • GEOMORPHIC LANDFORMS/PROCESSES
    • EARTH SCIENCE
    • LAND SURFACE
    • TOPOGRAPHY
    • TERRAIN ELEVATION
    • EARTH SCIENCE
    • LAND SURFACE
    • TOPOGRAPHY
    • TOPOGRAPHIC EFFECTS
    • EARTH SCIENCE
    • LAND SURFACE
    • TOPOGRAPHY
    • TERRAIN ELEVATION
    • TOPOGRAPHICAL RELIEF MAPS
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • INFRARED WAVELENGTHS
    • REFLECTED INFRARED
    • BIDIRECTIONAL REFLECTANCE DISTRIBUTION
Other Descriptive Keywords
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Ancillary Keywords
  • imagery
  • EROS
  • ALBEDO
  • ASAS
  • BIDIRECTIONAL REFLECTANCE DISTRIBUTION FUNCTION
  • DAAC
  • USGS/EROS
  • LP DAAC
  • EOSDIS
  • IMAGERY
  • NASA C-130B
  • NASA C-130Q
  • NASA P-3B
  • REFLECTANCE
  • USGS
ISO Topic Categories
  • GEOSCIENTIFIC INFORMATION
  • IMAGERY/BASE MAPS/EARTH COVER
Additional Attributes
  • metadata.uuid
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • metadata.extraction_date
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • metadata.keyword_version
    FLOAT
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

Acquisition Information Fields:

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Platforms
  • NASA ER-2
    Instruments
    • ASAS
Projects
Project Short Name Campaigns Project Dates
EOSDIS No campaigns listed. No dates provided.

Temporal Information Fields:

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN NO_SPATIAL
Location Keywords
    • CONTINENT
    • AFRICA
    • NORTHERN AFRICA
    • ALGERIA
    • CONTINENT
    • AFRICA
    • WESTERN AFRICA
    • BURKINA FASO
    • CONTINENT
    • NORTH AMERICA
    • CANADA
    • CONTINENT
    • AFRICA
    • CENTRAL AFRICA
    • CHAD
    • CONTINENT
    • AFRICA
    • NORTHERN AFRICA
    • LIBYA
    • CONTINENT
    • AFRICA
    • WESTERN AFRICA
    • MALI
    • CONTINENT
    • AFRICA
    • WESTERN AFRICA
    • NIGER
    • CONTINENT
    • AFRICA
    • WESTERN AFRICA
    • NIGERIA
    • CONTINENT
    • NORTH AMERICA
    • UNITED STATES OF AMERICA
    • CONTINENT
    • AFRICA
    • WESTERN AFRICA

Data Centers

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  • USGS EROS
    ORIGINATOR

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

  • DOI/USGS/EROS
    Multiple Roles

    ARCHIVER

    DISTRIBUTOR

    Earth Resources Observation and Science Center, U.S. Geological Survey, U.S. Department of the Interior

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

Data Contacts

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  • ANNIEPAT
    Metadata Author
    ANNIEPAT JOHNSON

    EROS
    Sioux Falls, SD 57198

  • JAMES
    Investigator
    JAMES IRONS

    Dr. James Irons
    NASA Goddard Space Flight Center
    Code 923, Bldg. 22, Rm. G36
    Greenbelt, MD 20771

    • Email
    • 301-286-0239
    • 301-286-8978
  • ANNIEPAT
    Data Center Contact
    ANNIEPAT JOHNSON

    DOI/USGS/EROS

    EROS
    Sioux Falls, SD 57198

Collection Citations Fields:

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    Collection Citations
    • Advanced Solid-state Array Spectroradiometer Data Collection

      Created by: Land Processes Distributed Active Archive Center

      Published by: U.S. Geological Survey

      Released: 1998-01-01

      • Not provided