# Monitoring Spatial and Temporal Variabilities of Gross Primary Production Using MAIAC MODIS Data
## 3 Results
### Monitoring Spatial Variability, Seasonality, Interannual Variability, and Trends  
Mean annual GPP and average peak-season RSVIs for each site were not significantly correlated (Figure 4a). In contrast, average annual CCI and NDVI were positively correlated with average GPP for each site, albeit explaining only a small proportion of the spatial variability of GPP (Figure 4b). Our results instead indicated good relationships between the seasonality of the RSVIs and the seasonality of GPP (Figure 5). EVI and NIR\({}_{\
u}\) predicted the seasonality of GPP the best, accounting for almost half of the spatial variability of GPP seasonality. EVI, NIR\({}_{\
u}\), and NDVI had similar ranges of seasonality amongst the sites, but CCI had a much smaller range of seasonality. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Ecosystem** & **NDVI** & **EVI** & **NIR\({}_{\
u}\)** & **CCI** & **N** \\ \hline \multicolumn{6}{c}{_Weekly_} \\ ENF & **0.42 \(\pm\) 0.07** & **0.43 \(\pm\) 0.05** & **0.46 \(\pm\) 0.06** & **0.13 \(\pm\) 0.03** & 16 \\ EBF & **0.19 \(\pm\) 0.07** & **0.20 \(\pm\) 0.08** & 0.19 \(\pm\) 0.08 & **0.11 \(\pm\) 0.02** & 3 \\ DBF & **0.42 \(\pm\) 0.09** & **0.53 \(\pm\) 0.10** & **0.54 \(\pm\) 0.10** & **0.24 \(\pm\) 0.07** & 10 \\ MF & **0.48 \(\pm\) 0.01** & **0.68 \(\pm\) 0.01** & **0.66 \(\pm\) 0.01** & **0.30 \(\pm\) 0.07** & 3 \\ OSH & 0.51 \(\pm\) NA & 0.47 \(\pm\) NA & 0.50 \(\pm\) NA & 0.00 \(\pm\) NA & 2 \\ GRA & **0.62 \(\pm\) 0.05** & **0.56 \(\pm\) 0.05** & **0.55 \(\pm\) 0.05** & **0.25 \(\pm\) 0.04** & 9 \\ CRO & **0.35 \(\pm\) 0.06** & **0.39 \(\pm\) 0.05** & **0.40 \(\pm\) 0.06** & **0.14 \(\pm\) 0.03** & 10 \\ WET & **0.48 \(\pm\) 0.07** & **0.55 \(\pm\) 0.07** & **0.56 \(\pm\) 0.08** & **0.25 \(\pm\) 0.05** & 5 \\ Mean & **0.43 \(\pm\) 0.03** & **0.48 \(\pm\) 0.03** & **0.49 \(\pm\) 0.03** & **0.19 \(\pm\) 0.02** & 58 \\ \hline \multicolumn{6}{c}{_Weekly anomalies_} \\ ENF & **0.03 \(\pm\) 0.01** & 0.02 \(\pm\) 0.01 & **0.03 \(\pm\) 0.01** & 0.01 \(\pm\) 0.00 & 16 \\ EBF & 0.02 \(\pm\) 0.01 & 0.01 \(\pm\) 0.01 & 0.01 \(\pm\) 0.01 & 0.06 \(\pm\) 0.03 & 3 \\ DBF & **0.07 \(\pm\) 0.02** & **0.07 \(\pm\) 0.02** & **0.07 \(\pm\) 0.02** & **0.07 \(\pm\) 0.01** & 10 \\ MF & 0.02 \(\pm\) 0.01 & 0.01 \(\pm\) 0.01 & 0.02 \(\pm\) 0.02 & 0.01 \(\pm\) 0.00 & 3 \\ OSH & 0.05 \(\pm\) NA & 0.05 \(\pm\) NA & 0.03 \(\pm\) NA & 0.00 \(\pm\) NA & 2 \\ GRA & **0.10 \(\pm\) 0.03** & **0.08 \(\pm\) 0.02** & **0.09 \(\pm\) 0.03** & 0.02 \(\pm\) 0.01 & 9 \\ CRO & **0.08 \(\pm\) 0.02** & **0.11 \(\pm\) 0.03** & **0.10 \(\pm\) 0.03** & **0.06 \(\pm\) 0.02** & 10 \\ WET & 0.00 \(\pm\) 0.00 & 0.00 \(\pm\) 0.00 & 0.01 \(\pm\) 0.00 & 0.02 \(\pm\) 0.01 & 5 \\ Mean & **0.05 \(\pm\) 0.00** & **0.05 \(\pm\) 0.01** & **0.06 \(\pm\) 0.01** & **0.03 \(\pm\) 0.01** & 58 \\ \hline \multicolumn{6}{c}{_Monthly_} \\ ENF & **0.43 \(\pm\) 0.06** & **0.49 \(\pm\) 0.06** & **0.50 \(\pm\) 0.06** & **0.20 \(\pm\) 0.04** & 16 \\ EBF & 0.16 \(\pm\) 0.07 & 0.23 \(\pm\) 0.12 & 0.23 \(\pm\) 0.12 & **0.10 \(\pm\) 0.04** & 3 \\ DBF & **0.43 \(\pm\) 0.09** & **0.55 \(\pm\) 0.11** & **0.56 \(\pm\) 0.11** & **0.35 \(\pm\) 0.10** & 10 \\ MF & **0.45 \(\pm\) 0.03** & **0.77 \(\pm\