## 3 Results  
Figure 2a shows the temporal variation in PAI and LAI, measured on the ground at the Risley Moss plot. The pattern is typical for deciduous woodland in the U.K. At the beginning of the sampling period, February 25, 2005, the LAI was very low, and after leaf emergence and expansion, LAI increased to a maximum of 4.7 in late July, 2005, before declining rapidly in the autumn, with senescence and leaf fall, to zero in January, 2006. Variations associated with the estimates of LAI from the study plot were largest during the periods of highest LAI. \begin{table}
\begin{tabular}{l l l l} \hline \hline
**Satellite Sensor/DOY** & **Band** & **Equation** & \(\mathbf{R}^{2}\) \\ \hline  & NIR & \(y=0.6758x-6.667\) & 0.85 \\ NigeriaSat-1 3 March 2005 (DOY 62) & Red & \(y=0.6042x-8.0619\) & 0.87 \\  & Green & \(y=0.3933x-10.955\) & 0.76 \\ \hline  & NIR & \(y=0.6872x-10.874\) & 0.86 \\ NigeriaSat-1 19 April 2005 (DOY 109) & Red & \(y=0.4377x-1.9077\) & 0.82 \\  & Green & \(y=0.3329x-7.5286\) & 0.85 \\ \hline  & NIR & \(y=0.4542x+0.5063\) & 0.81 \\ UK-DMC 30 May 2005 (DOY 150) & Red & \(y=0.46x-3.9527\) & 0.94 \\  & Green & \(y=0.3008x-2.6979\) & 0.91 \\ \hline  & NIR & \(y=0.6375x-9.7863\) & 0.94 \\ NigeriaSat-1 8 June2005 (DOY 159) & Red & \(y=0.5919x-6.1429\) & 0.89 \\  & Green & \(y=0.4101x-9.8495\) & 0.89 \\ \hline  & NIR & \(y=0.7268x-11.913\) & 0.93 \\ UK-DMC 27 June 2005 (DOY 192) & Red & \(y=0.5542x-6.0036\) & 0.97 \\  & Green & \(y=0.3171x-2.8123\) & 0.97 \\ \hline  & NIR & \(y=0.609x-13.112\) & 0.85 \\ NigeriaSat-1 17 August 2005 (DOY 226) & Red & \(y=0.5236x-11.437\) & 0.85 \\  & Green & \(y=0.4021x-16.878\) & 0.80 \\ \hline  & NIR & \(y=0.6349x-6.4932\) & 0.85 \\ NigeriaSat-1 2 September 2005 (DOY 245) & Red & \(y=0.4973x-1.3109\) & 0.96 \\  & Green & \(y=0.3073x-5.0942\) & 0.87 \\ \hline  & NIR & \(y=0.7612x-3.0871\) & 0.90 \\ UK-DMC 19 February 2006 (DOY 50) & Red & \(y=1.4179x-12.093\) & 0.76 \\  & Green & \(y=1.8748x-16.912\) & 0.62 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Equations for image inter-calibration (\(n=27\)). Temporal variations were also observed in the reflectance recorded in the three DMC bands (Figure 2b). Reflectance in the visible bands, green and red, was never higher than 5.2% and reached a minimum during the summer between day of year (DOY) 159 and 226 in 2005, with the lowest values around DOY 192. The general variation in red and green reflectance was similar; however, red reflectance was lower than green around the middle of the summer, and green reflectance was lower than red when the vegetation was senescing. NIR reflectance ranged between 16% in winter and 42% in summer. The variation in NIR was characterized by an increase in reflectance towards the middle of the year, with a maximum of 42% reached around DOY 178 in 2005. A second peak in NIR reflectance was observed in the 2005-2006-2006-2006-2006-2006-2006-2006-2006-2006-2  
occurred around DOY 226 in 2005, with a reflectance of 39%, before it dropped back to about 18%. The general pattern was of increasing NIR during the growing season, with visible reflectance low over most of the growing cycle. Figure 2c shows the temporal profile of the three vegetation indices derived from the DMC data for the study plot. The magnitude of the different indices varied, with NDVI having the highest values across the study period and DVI having the lowest. However, most important was that, even though they appeared noisy to some extent, the general form of the variation in the curves for the vegetation indices followed the trend in the LAI variation over the growing cycle. The minimum values for all three of the vegetation indices were found in February (DOY 50 in 2006), which coincided with an LAI value of around 0.2. The highest values for the three vegetation indices were in July, 2005 (DOY 192), which was very close to the highest value recorded for LAI, 4.67, measured at the study plot on DOY 210 in 2005.