[Keyword='COUNTY']
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Conterminous U.S. AVHRR Bi-Weekly Composites Entry ID: USAVHRR |
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Summary
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Abstract:
The goal of the Conterminous U.S. AVHRR project is to compile a comprehensive time series data set of calibrated, georegistered daily observations and biweekly maximum normalized difference vegetation index (NDVI) composites for each annual growing season. This data set has applications for environmental monitoring and for assessing impacts of global climate change. The Conterminous U.S. AVHRR Data Set is comprised of biweekly maximum NDVI composites, which were created from daily satellite observations. The NDVI composites include 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 Lambert Azimuthal Equal Area 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 with precise registration to ensure that from day to day each 1-km pixel represented the exact same ground location. The Lambert Azimuthal Equal Area map projection provides for equal area characteristics, which enables easy measurement of area throughout the data. Each daily observation for the growing season was registered to the base image using image-to-image correlation. The NDVI was calculated from calibrated data, which had been scaled to byte range and geometrically registered. The NDVI is the difference between near-infrared (AVHRR Channel 2) and visible (AVHRR Channel 1) reflectance values divided by total reflectance. The method for determining the portion of each overpass to be included in the composite image was to retain pixels having the highest NDVI values. The NDVI was examined pixel by pixel for each overpass within the biweekly compositing period to determine the maximum value. The output of the compositing process is a 10-band image as described above. Often when displaying data covering large areas, such as AVHRR data, it is beneficial to include an overlay of familiar linework as a location aid or a mask or strata to derive statistical data for 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 raster polygon data sets included are the climatic division boundaries, major land resource area boundaries, and county boundaries. |
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Link:
VIEW RELATED INFORMATION
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Geographic Coverage
| N: 50.0 | S: 23.0 | E: -56.0 | W: -125.0 |
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Data Set Citation
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Dataset Originator/Creator:
U.S. Geological Survey
Dataset Title: Conterminous U.S. AVHRR Bi-Weekly Composites Dataset Release Date: 1989 Dataset Release Place: Sioux Falls, South Dakota, USA Dataset Publisher: U.S. Geological Survey Data Presentation Form: Remote Sensing Image |
Temporal Coverage
| Start Date: 1989-01-04 |
Location Keywords
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CONTINENT
> NORTH AMERICA
> UNITED STATES OF AMERICA
CONTINENT > NORTH AMERICA |
Science Keywords
| BIOSPHERE >VEGETATION >VEGETATION COVER >NDVI [Definition] |
| LAND SURFACE >LAND USE/LAND COVER >LAND COVER [Definition] |
| LAND SURFACE >LAND USE/LAND COVER >LAND RESOURCES [Definition] |
| SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >INFRARED IMAGERY [Definition] |
| SPECTRAL/ENGINEERING >VISIBLE WAVELENGTHS >VISIBLE IMAGERY [Definition] |
ISO Topic Category
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BIOTA
GEOSCIENTIFIC INFORMATION IMAGERY/BASE MAPS/EARTH COVER |
Platform
| NOAA-10 >National Oceanic & Atmospheric Administration-10 [Information] |
| NOAA-11 >National Oceanic & Atmospheric Administration-11 [Information] |
| NOAA-12 >National Oceanic & Atmospheric Administration-12 [Information] |
| NOAA-14 >National Oceanic & Atmospheric Administration-14 [Information] |
| NOAA-15 >National Oceanic & Atmospheric Administration-15 [Information] |
| NOAA-16 >National Oceanic & Atmospheric Administration-16 [Information] |
| NOAA-17 >National Oceanic & Atmospheric Administration-17 [Information] |
| NOAA-18 >National Oceanic & Atmospheric Administration-18 [Information] |
| NOAA-19 >National Oceanic & Atmospheric Administration-19 [Information] |
Instrument
| AVHRR >Advanced Very High Resolution Radiometer [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
| AVHRR |
| CLIMATIC DIVISION |
| COMPOSITE |
| COUNTY |
| USGS/EROS |
| FIPS |
| HRPT |
| IMAGERY |
| LAC |
| LAND RESOURCE AREA |
| LAS |
| NDVI |
| RADIANCE |
| RASTER |
| SATELLITE |
| USGS |
Data Set Progress
| IN WORK |
Originating Center
| USGS/EROS |
Data Center
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Earth Resources Observation and Science Center, U.S. Geological Survey, U.S. Department of the Interior
[Information]
Data Center URL: http://eros.usgs.gov/ Dataset ID: USAVHRR
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Distribution
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Distribution_Media:
Downloadable
Fees: None |
Personnel
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EROS CENTER Role: TECHNICAL CONTACT Phone: 605-594-6151 Phone: 800-252-4547 Fax: 605-594-6589 Email: lta at usgs.gov Contact Address: LTA Customer Services U.S. Geological Survey EROS Center 47914 252nd Street City: Sioux Falls Province or State: SD Postal Code: 57198-0001 Country: USA |
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LONG TERM ARCHIVE Role: DIF AUTHOR Phone: 605-594-6594 Fax: 605-594-6589 Email: lta at usgs.gov Contact Address: Information Systems Management U.S. Geological Survey EROS Center 47914 252nd Street City: Sioux Falls Province or State: SD Postal Code: 57198-0001 Country: USA |
Publications/References
Ailts, B.L., Akkerman, D.B., Quirk, B.K., and Steinwand, D.R., 1990, LAS
5.0--an image processing system for research and production
environments, in American Society of Photogrammetry and Remote Sensing American Congress of Surveying and Mapping Annual Convention, Denver, Colorado, Proceedings: v.4, p. 1-12.
Holben, B.N., 1986, Characteristics of maximum-value composite images from
temporal AVHRR data: The International Journal of Remote Sensing, v.7, no.11, p. 1,417.
5.0--an image processing system for research and production
environments, in American Society of Photogrammetry and Remote Sensing American Congress of Surveying and Mapping Annual Convention, Denver, Colorado, Proceedings: v.4, p. 1-12.
Holben, B.N., 1986, Characteristics of maximum-value composite images from
temporal AVHRR data: The International Journal of Remote Sensing, v.7, no.11, p. 1,417.
Creation and Review Dates
Last DIF Revision Date:
2013-05-14
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