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Summary
The goal of the Alaska Advanced Very High Resolution Radiometer (AVHRR)
project is to compile a time series data set of calibrated, georegistered
daily observations and twice-monthly maximum normalized difference vegetation
index (NDVI) composites for Alaska's annual growing season (April-October).
This data set has applications for environmental monitoring and ... for assessing
impacts of global climate change. An Alaska AVHRR data set is comprised of
twice-monthly maximum NDVI composites of daily satellite observations. The
NDVI composites contain 10 bands of information, including AVHRR channels 1-5,
maximum NDVI, satellite zenith, solar zenith, and relative azimuth. The daily
observations, bands 1-9, have been calibrated to reflectance, scaled to
byte data, and geometrically registered to the Albers Equal-Area Conic map
projection. The 10th band is a pointer to identify the date and scene ID of
the source daily observation (scene) for each pixel.

The compositing process required each daily overpass to be registered to a
common map projection to ensure that from day to day each 1-km pixel
represented the exact same ground location. The Albers Equal-Area Conic map
projection provides for equal area representation, which enables easy
measurement of area throughout the data. Each daily observation for the
growing season was registered to a base image using image-to-image correlation.

The NDVI data are calculated from the calibrated, geometrically registered
daily observations. The NDVI value is the difference between near-infrared
(AVHRR Channel 2) and visible (AVHRR Channel 1) reflectance values divided by
total measured reflectance. A maximum NDVI compositing process was used on
the daily observations. The NDVI is examined pixel by pixel for each
observation during the compositing period to determine and retain the maximum
value. Often when displaying data covering large areas, such as AVHRR data,
it is beneficial to include an overlay of either familiar linework for
reflectance or polygon data sets to derive statistical summaries of regions.
All of the linework images represent lines in raster format as 1-km cells and
the strata are represented as polygons registered to the AVHRR data. The
linework and polygon data sets include international boundaries, Alaskan roads
with the Trans-Alaska Pipeline, and a raster polygon mask of the State.

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Geographic Coverage Spatial coordinates   

N: 70.0

S: 51.0

E: -116.0

W: -179.0

Data Set Citation

Dataset Creator: U.S. Geological Survey Dataset Title: Alaska AVHRR Twice-Monthly Composites Dataset Release Date: 1990 Dataset Release Place: Sioux Falls, South Dakota, USA Dataset Publisher: U.S. Geological Survey Data Presentation Form: Remote Sensing Image

Temporal Coverage

Start Date: 1990-06-16

Location Keywords

CONTINENT > NORTH AMERICA CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA > ALASKA

Science Keywords

BIOSPHERE > VEGETATION > VEGETATION COVER > NDVI SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED IMAGERY SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE IMAGERY

ISO Topic Category

BIOTA IMAGERY/BASE MAPS/EARTH COVER

Platform

NOAA-11 > National Oceanic & Atmospheric Administration-11 NOAA-14 > National Oceanic & Atmospheric Administration-14

Instrument

AVHRR > Advanced Very High Resolution Radiometer

Access Constraints
None

Use Constraints
None

Ancillary Keywords

ALASKA PIPELINE AVHRR COMPOSITE USGS/EROS HRPT IMAGERY LAC NDVI RADIANCE RASTER ROADS SATELLITE USGS

Data Set Progress

IN WORK

Originating Center

USGS/EROS

Data Center

Center for Earth Resources Observation and Science, U.S. Geological Survey, U.S. Department of the Interior Data Center URL: http://eros.usgs.gov/ Dataset ID: AK_AVHRR Data Center Personnel Name: EROS DATA CENTER Phone: 605-594-6151 Phone: 800-252-4547 Fax: 605-594-6589 Email: custserv at usgs.gov Contact Address: Customer Services U.S. Geological Survey EROS Data Center 47914 252nd Street City: Sioux Falls Province or State: SD Postal Code: 57198-0001 Country: USA

Distribution

Distribution Media: Compact Disc (Recordable) Distribution Size: 650 megabyte maximum Distribution Format: ISO 9660 Fees: $50.00 Distribution Media: Compact Disc-Read Only Memory (CD-ROM) Distribution Size: 650 megabyte maximum Distribution Format: ISO 9660 Fees: $32.00

Personnel

EROS DATA CENTER Role: TECHNICAL CONTACT Phone: 605-594-6151 Phone: 800-252-4547 Fax: 605-594-6589 Email: custserv at usgs.gov Contact Address: Customer Services U.S. Geological Survey EROS Data Center 47914 252nd Street City: Sioux Falls Province or State: SD Postal Code: 57198-0001 Country: USA INFORMATION SYSTEMS MANAGEMENT Role: DIF AUTHOR Phone: 605-594-6594 Fax: 605-594-6589 Email: custserv at usgs.gov Contact Address: Information Systems Management U.S. Geological Survey EROS Data Center 47914 252nd Street City: Sioux Falls Province or State: SD Postal Code: 57198-0001 Country: USA

Publications/References
Ailts, Blaine, Akkerman, Daniel, Quirk, Bruce, and Steinwand, Daniel,1990, LAS
5.0--an image processing system for research and production environments,
in ACSM/ASPRS Annual Convention, 50th/56th, Denver, Colorado, March 18-23,
1990, Proceedings: Bethesda, Maryland, American Congress on Surveying and
Mapping, American Society of Photogrammetry and Remote Sensing, v. 4, p. 1-12.

Holben, B.N., 1986, Characteristics of maximum-value composite images from
temporal AVHRR Data: International Journal of Remote Sensing, v. 7, no. 11, p.
1,417-1,434.

Creation and Review Dates

Last DIF Revision Date: 2006-10-13

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