3.3.2. LAI and VEGETATION NDVI
The application of a similar analysis to the LAI–
VEGETATION NDVI relation reveals patterns previously
observed for AVHRR. Similar to the LAI–AVHRR NDVI,
there were obvious intraannual effects on the LAI–VEGETATION
NDVI relationship as well (see Table 1). Strong
linear relationships were found for VEGETATION NDVI
and LAI for each year during the leaf production period,
with R2 values of 0.99, 0.92, and 1.00 for the year 1999,
2000, and 2001, respectively. Again, R2 decreased to 0.07
all these 3 years data during the leaf production period were
included. By eliminating the background effect and pooling
the data, we obtained:
LAI ¼ 37:45TNDVIrelative; VEGETATION 2:4016
R2 ¼ 0:85