Differences in Visible and Near-IR Responses, and Derived Vegetation Indices, for the NOAA-9 and NOAA-10 AVHRRs (Advanced Very High Resolution Radiometers): A Case Study
Abstract
This study evaluates the differences in the visible and near-IR responses of the Advanced Very High Resolution Radiometers (AVHRR) of the National Oceanic and Atmospheric Administration (NOAA)-9 and -10 satellites for coincident sample locations. The study also evaluates the differences in vegetation indices computed from those data. Data were acquired of the southeast portion of the United States for the 6 December 1986 daylight orbits of NOAA-9 and NOAA-10 satellites. The data sets were registered and 38 coincident sample locations were selected that included land and water surfaces. The data were calibrated to reflectance values with coefficients supplied by NOAA. The visible and near-IR reflectance values and the derived vegetation index values of the NOAA-9 AVHRR were usually greater than those of the NOAA-10. Visible and near-IR reflectance values exhibited trends that appeared to be related to the satellite scan angles at the examined sample locations. Linear relationships were developed between the vegetation indices of the two systems. The vegetation index values for the NOAA-9 and NOAA-10 AVHRR displayed nearly constant differences for a variety of surface features. The results suggest that, with appropriate gain and offset, the vegetation indices of the two sensor systems may be interchangeable for assessment of land surfaces.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1988
- Accession Number
- ADA194774
Entities
People
- J. C. Eidenshink
- K. P. Gallo
Organizations
- National Environmental Satellite, Data, and Information Service