## 3 Results
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Attribute** & **Raw** & \multicolumn{3}{c}{**Thresholded DoD Estimate:**} \\ \hline Areal Metrics & & & & \% of AoI \\ Total Area of Surface Lowering (m\({}^{2}\)) & 724 & 48 & & 1.6\% \\ Total Area of Surface Raising (m\({}^{2}\)) & 716 & 13 & & 1.6\% \\ Total Area of Detectable Change (m\({}^{2}\)) & 1440 & 61 & & 4.0\% \\ Total Area of Interest (m\({}^{2}\)) & 45,444 & NA & & NA \\ Total Volumetric Metrics & & & \(\pm\)Error Volume & \% Error \\ Total Volume of Surface Lowering (m\({}^{3}\)) & 21 & 12 & \(\pm\)5 & 40\% \\ Total Volume of Surface Raising (m\({}^{3}\)) & 9 & 2 & \(\pm\)1 & 55\% \\ Total Volume of Difference (m\({}^{3}\)) & 30 & 14 & \(\pm\)6 & 43\% \\ Total Net Volume Difference (m\({}^{3}\)) & \(-\)12 & \(-\)10 & \(\pm\)5 & \(-\)52\% \\ Vertical Averages: & & & & \\ Average Depth of Surface Lowering (m) & 0.03 & 0.25 & \(\pm\)0.100 & 40\% \\ Average Depth of Surface Raising (m) & 0.01 & 0.18 & \(\pm\)0.100 & 55\% \\ Average Total Thickness of Difference (m) for Area of Interest & 0.02 & 0.01 & \(\pm\)0.004 & 43\% \\ Average Net Thickness Difference (m) for Area of Interest & \(-\)0.01 & \(-\)0.01 & \(\pm\)0.003 & \(-\)52\% \\ Percentages (by volume) & & & & \\ Percent Elevation Lowering & 69\% & 84\% & & \\ Percent Surface Raising & 31\% & 16\% & & \\ Percent Imbalance (departure from equilibrium) & \(-\)19\% & \(-\)34\% & & \\ Net to Total Volume Ratio & \(-\)38\% & \(-\)67\% & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Changes in physical parameters of the Area of Interest in July 2010 calculated volumetrically with reference to the total volume of the gravel-cobble material’s net change recorded by the DoD (both lowering and raising) from the manually cleaned-up (new) to the CSF-filtered (old) DTM. The uncertainty analysis was calculated by simply using the minimum level of detection (minLoD) approach while accounting for a uniform error of 0.1 m. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Attribute** & **Raw** & \multicolumn{3}{c}{**Thresholded DoD Estimate**:} \\ \hline Areal Metrics & & & & \% of AoI \\ Total Area of Surface Lowering (m\({}^{2}\)) & 21,977 & 89 & & 0.40\% \\ Total Area of Surface Raising (m\({}^{2}\)) & 23,467 & 5 & & 0.02\% \\ Total Area of Detectable Change (m\({}^{2}\)) & 45,444 & 94 & & 0.21\% \\ Total Area of Interest (m\({}^{2}\)) & 45,444 & NA & & NA \\ Total Volumetric Metrics & & & & \(\pm\)Error Volume & \% Error \\ Total Volume of Surface Lowering (m\({}^{3}\)) & 33 & 15 & \(\pm\) 9 & 61\% \\ Total Volume of Surface Raising (m\({}^{3}\)) & 7 & 1 & \(\pm\) 1 & 62\% \\ Total Volume of Difference (m\({}^{3}\)) & 41 & 15 & \(\pm\) 9 & 61\% \\ Total Net Volume Difference (m\({}^{3}\)) & \(-\)26 & \(-\)14 & \(\pm\) 9 & \(-\)65\% \\ Vertical Averages: & & & & \\ Average Depth of Surface Lowering (m) & 0.0015 & 0.1645 & \(\pm\) 0.1000 & 61\% \\ Average Depth of Surface Raising (m) & 0.0003 & 0.1619 & \(\pm\) 0.1000 & 62\% \\ Average Total Thickness of Difference (m) for Area of Interest & 0.0009 & 0.0003 & \(\pm\) 0.0002 & 61\% \\ Average Net Thickness Difference (m) for Area of Interest & \(-\)0.0006 & \(-\)0.0003 & \(\pm\) 0.0002 & \(-\)65\% \\ Percentages (by volume) & & & & \\ Percent Elevation Lowering & 82\% & 95\% & & \\ Percent Surface Raising & 18\% & 5\% & & \\ Percent Imbalance (departure from equilibrium) & \(-\)32\% & \(-\)45\% & & \\ Net to Total Volume Ratio & \(-\)63\% & \(-\)89\% & & \\ \hline \hline \end{tabular} NA = not available.  
\end{table} 
Table 3: Changes in physical parameters of the Area of Interest in July 2013 calculated volumetrically with reference to the total volume of the gravel-cobble material’s net change recorded by the DoD (both lowering and raising) from the manually cleaned-up (new) to the CSF-filtered (old) DTM. The uncertainty analysis was calculated by simply using the minimum level of detection (minLoD) approach while accounting for a uniform error of 0.1 m.  
Figure 5: DEM of difference (DoD) for the AoI (July 2013 with MinLoD = 0.1).