The NDVI is a measure of green vegetation cover derived from the NOAA-AVHRR satellite sensor. It is routinely produced by Landgate's Satellite Remote Sensing Services (SRSS) for monitoring drought, bush fire risk and forecasting crop yields. NDVI with continental coverage and minimal cloud at intervals of 14 days is derived from combining data from successive NOAA-AVHRR overpasses.
The NDVI is a maximum value composite without any screening of the data for cloud. Angle restrictions were applied to minimise bidirectional reflectance function effects. The NDVI was calculated from reflectances using post-flight radiometric calibrations but no atmospheric correction.
The NOAA satellite data is collected by the Western Australian Satellite Technology and Applications Consortium (WASTAC) and held by SRSS.
The images on this internet archive have been degraded to 10km resolution but are available from SRSS at full 1 km resolution. The internet 'NOAA NDVI Monthly Archive' was created in January 2001.