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Global Change Master Directory (GCMD)
Advanced Solid-state Array Spectroradiometer (ASAS)
Entry ID: asas


Summary
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.

Related URL
Link: View Related Information
Description: Query and order satellite images, aerial photographs, and cartographic products through the U.S. Geological Survey. Log in as a guest or as a registered user. Registered users have access to more features than guests do. If you plan on using EarthExplorer frequently, you may wish to register. Please note that this site uses Session Cookies and Java applets.


Link: View Related Information
Description: The Advanced Solid-state Array Spectroradiometer home page.

Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0
 N: 38.0 S: 5.0  E: 25.0  W: -5.0

Data Set Citation
Dataset Creator: Land Processes Distributed Active Archive Center
Dataset Title: Advanced Solid-state Array Spectroradiometer Data Collection
Dataset Release Date: 1998-01-01T00:00:00.000Z
Dataset Release Place: Sioux Falls, South Dakota, USA
Dataset Publisher: U.S. Geological Survey
Version: Not provided
Data Presentation Form: Remote Sensing Image


Temporal Coverage
Start Date: 1988-06-26


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


Science Keywords
LAND SURFACE >EROSION/SEDIMENTATION >EROSION >BIDIRECTIONAL REFLECTANCE DISTRIBUTION    [Definition]
LAND SURFACE >LAND USE/LAND COVER >LAND USE/LAND COVER CLASSIFICATION >BIDIRECTIONAL REFLECTANCE DISTRIBUTION    [Definition]
LAND SURFACE >LANDSCAPE >REFORESTATION >BIDIRECTIONAL REFLECTANCE DISTRIBUTION    [Definition]
LAND SURFACE >SURFACE RADIATIVE PROPERTIES >ALBEDO >BIDIRECTIONAL REFLECTANCE DISTRIBUTION    [Definition]
LAND SURFACE >GEOMORPHIC LANDFORMS/PROCESSES    [Definition]
LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION    [Definition]
LAND SURFACE >TOPOGRAPHY >TOPOGRAPHIC EFFECTS    [Definition]
LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION >TOPOGRAPHICAL RELIEF MAPS    [Definition]
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >REFLECTED INFRARED >BIDIRECTIONAL REFLECTANCE DISTRIBUTION    [Definition]


Platform
NASA ER-2 >NASA Earth Resources-2    [Information]


Instrument
ASAS >Advanced Solid-state Array Spectroradiometer


Project
EOSDIS >Earth Observing System Data Information System    [Information]


Access Constraints
None


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.


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


Data Set Progress
ACTIVE


Data Center
Earth Resources Observation and Science Center, U.S. Geological Survey, U.S. Department of the Interior    [Information]
Data Center URL: https://www.usgs.gov/centers/eros

Data Center Personnel
Name: ANNIEPAT JOHNSON
Phone: 605-594-6973
Email: lta at usgs.gov
Contact Address:
EROS
City: Sioux Falls
Province or State: SD
Postal Code: 57198
Country: USA



Distribution
Distribution_Media: Digital
Distribution_Format: Download
Fees: None


Personnel
ANNIEPAT JOHNSON
Role: METADATA AUTHOR
Phone: 605-594-6973
Email: lta at usgs.gov
Contact Address:
EROS
City: Sioux Falls
Province or State: SD
Postal Code: 57198
Country: USA


JAMES IRONS
Role: INVESTIGATOR
Phone: 301-286-8978
Fax: 301-286-0239
Email: jim_irons at gsfc.nasa.gov
Contact Address:
Dr. James Irons
NASA Goddard Space Flight Center
Code 923, Bldg. 22, Rm. G36
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 1970-01-01
Last DIF Revision Date: 2019-03-25



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