## 3 Results
### NDVI Trend Intercomparison
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c c c} \hline  & \multicolumn{4}{c}{\(N_{p_{max}}\)} & \multicolumn{4}{c}{**Duration of Season**} & \multicolumn{4}{c}{**Start of Season**} & \multicolumn{4}{c}{**End of Season**} \\  & \multicolumn{4}{c}{**(per decade)**} & \multicolumn{4}{c}{**(days/decade)**} & \multicolumn{4}{c}{**(days/decade)**} & \multicolumn{4}{c}{**(days/decade)**} & \multicolumn{4}{c}{**(days/decade)**} \\ \hline
**IGBP Type** & **g** & **3 g** & **ST** & **V** & **g** & **3 g** & **ST** & **V** & **g** & **3 g** & **ST** & **V** & **g** & **3 g** & **ST** & **V** & **g** & **3 g** & **ST** & **V** \\ \hline
1 ENFor & \(-\)_0.012_ & 0.003 & **0.011** & \(-\)_0.015_ & \(-\)1.1 & 7.7 & **17.1** & \(-\)11.7 & **9.9** & **6.2** & \(-\)5.2 & 2.0 & 2.0 & 1.6 & **11.0** & \(-\)3.0 \\
2 EBFor & 0.002 & \(-\)0.001 & **0.016** & **0.031** & \(-\)12.5 & 3.0 & **31.3** & **42.4** & \(-\)2.8 & \(-\)4.0 & 7.8 & \(-\)5.0 & \(-\)_20.1_ & \(-\)11.2 & **26.3** & 16.5 \\
3 DNFor & & & & & & & & & & & & & & & & & \\
4 DBFor & \(-\)_0.014_ & \(-\)0.003 & **0.015** & **0.028** & **4.9** & **5.9** & **15.6** & **15.2** & \(-\)0.7 & \(-\)2.1 & \(-\)_4.1_ & \(-\)_6.0_ & **4.7** & **4.5** & **10.6** & **8.1** \\
5 MiraFor & \(-\)_0.011_ & \(-\)0.001 & **0.013** & **0.016** & **6.2** & **7.5** & **21.2** & **17.6** & 1.6 & 1.4 & \(-\)2.1 & \(-\)**3.9** & **8.9** & **7.9** & **15.9** & **12.2** \\
6 CISChyhr & \(-\)_0.004_ & 0.000 & **0.009** & \(-\)0.10 & \(-\)2.9 & 1.5 & 23.8 & \(-\)10.6 & **32.6** & **22.3** & 35.7 & 11.2 & **27.2** & **22.0** & \(-\)55.2 & \(-\)10.1 \\
7 OpnShr & **0.014** & 0.001 & **0.009** & \(-\)0.009 & 3.8 & 3.9 & 13.9 & \(-\)_7.8_ & **25.3** & **13.2** & 33.2 & **14.3** & **29.1** & **14.8** & **42.7** & \(-\)6.2 \\
8 WdySav & \(-\)0.002 & 0.004 & **0.021** & **0.026** & **7.2** & **10.0** & **31.8** & **24.1** & \(-\)2.7 & \(-\)1.5 & \(-\)4.0 & \(-\)**7.9** & **9.1** & **8.1** & **26.3** & **15.5** \\
9 Sav & \(-\)0.005 & \(-\)0.004 & 0.009 & **0.013** & \(-\)_11.6_ & 0.9 & **17.1** & **11.8** & \(-\)0.3 & \(-\)0.7 & \(-\)**7.2** & \(-\)_21.3_ & \(-\)_17.0_ & \(-\)0.4 & 13.8 & \(-\)7.2 \\
10 Grass & **0.009** & 0.002 & 0.009 & 0.009 & 3.5 & 3.7 & **16.3** & 7.8 & 0.3 & 0.8 & \(-\)2.4 & \(-\)3.6 & 4.6 & **4.4** & **13.0** & 5.0 \\
11 WetInd & \(-\)0.003 & \(-\)0.001 & **0.019** & **0.031** & **16.2** & **13.9** & **30.2** & **20.7** & \(-\)4.5 & \(-\)2.6 & \(-\)_11.2_ & **-6.9** & **20.2** & **14.8** & **25.4** & **11.2** \\
12 Crop & **0.014** & **0.014** & **0.021** & **0.036** & 1.2 & 0.5 & **13.0** & **11.5** & 1.8 & 1.7 & \(-\)2.4 & \(-\)4.5 & 2.4 & 1.5 & **8.5** & **6.0** \\
13 Urban & \(-\)_0.010_ & \(-\)0.001 & 0.000 & \(-\)_0.012_ & \(-\)3.1 & \(-\)0.3 & **11.5** & \(-\)5.2 & 2.4 & 2.6 & \(-\)1.7 & 0.9 & 2.3 & 2.3 & **12.1** & 1.4 \\
14 CrpVeg & \(-\)_0.008_ & 0.002 & **0.015** & **0.029** & 2.3 & **4.9** & **18.0** & **18.8** & \(-\)0.7 & \(-\)0.6 & \(-\)3.1 & \(-\)_6.8_ & **3.2** & **3.7** & **10.5** & **8.1** \\
16 Barren & 0.005 & \(-\)0.001 & 0.000 & \(-\)_0.024_ & 0.9 & \(-\)1.3 & \(-\)1.5 & \(-\)_33.2_ & \(-\)7.3 & \(-\)16.2 & \(-\)13.2 & 32.7 & \(-\)4.4 & \(-\)4.5 & \(-\)1.2 & 15.3 \\ Total & **0.005** & 0.004 & **0.013** & **0.013** & 2. The change in NDVI-based phenology per land cover class for each product is shown in Table 3. For \(N_{p,max}\), only cropland shows significant and unanimous increases over the past 27 years among the four products. The only other category that has unanimous agreement is grassland which only has one significantly increasing dataset. There is also broad agreement in a general increase in \(N_{p,max}\) averaged across all land classes. Trends in the start of season are inconsistent across most classes with some consensus over a delayed start over the open and closed shrublands and an earlier start over deciduous broadleaf, mixed cropland vegetation and wetlands. The trends over semi-arid areas should be interpreted with caution since these areas have a multi-modal annual greening cycle.