## 3 Results  
### Results of CET Application on WV-Derived Models  
The application of the CET resulted in the extraction of 235 separate features, which were larger than the defined \(LOD_{min}\) (5 m\({}^{2}\)). However, most of these detected features were objects that do not actually represent land (e.g., small boats, waves, fish farms, etc. ), and as such, they were manually removed from the results. In total, 20 objects remained after visual verification, which represents true islands, islets, and rocks of the Iz-Rava island group. Coastline lengths, as well as the total area of extracted islands, islets, and rocks from the Iz-Rava island group, are given in Tables 4 and 5. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**ID**} & \multirow{2}{*}{**Island Name**} & \multicolumn{4}{c}{**Coastline Length (m)**} \\ \cline{3-5}  & & **TM (1:25,000)** & **[**14**]** & **CET-WV** \\ \hline
1 & _Ig_ & 36,546.77 & 44,461.74 & 49,754.00 \\
2 & _Rava_ & 16,662.97 & 23,765.53 & 22,512.00 \\
3 & _Knezak_ & 2415.48 & 3146.12 & 3310.00 \\
4 & _Beli_ & 1996.52 & 2182.22 & 2678.00 \\
5 & _Sridnji_ & 1800.95 & 2124.16 & 2406.00 \\
6 & _Fullja_ & 1239.08 & 1761.92 & 1688.00 \\
7 & _Tomeshjak_ & 1192.04 & 1423.79 & 1514.00 \\
8 & _Mrtroinjak_ (_Rava_) & 1108.53 & 1578.99 & 1660.00 \\
9 & _Ghuroic_ & 997.55 & 1225.01 & 1372.00 \\
10 & _Mrtroinjak_ (_Iz_) & 707.59 & 899.98 & 944.00 \\
11 & _Kudica_ & 691.41 & 745.22 & 932.00 \\
12 & _[PERSON]_ & 681.47 & 898.27 & 774.00 \\
13 & _[PERSON]_ & 592.10 & 628.07 & 908.00 \\
14 & _[PERSON]_ & 536.58 & 730.71 & 762.00 \\
15 & _[PERSON]_ & 376.20 & 411.62 & 520.00 \\
16 & _[PERSON]_ & 248.14 & 345.45 & 416.00 \\
17 & _[PERSON]_ & 177.19 & 244.80 & 302.00 \\
18 & _[PERSON]_ & 173.11 & 215.63 & 258.00 \\
19 & _[PERSON]_ & - & 24.99 & 38.00 \\
20 & _[PERSON]_ & - & 9.72 & 14.00 \\ \hline \multicolumn{5}{c}{Total coastline length (m)} & 68,143.67 & 86,823.93 & 92,762.00 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Extracted coastline lengths (m) of the Iz-Rava island group. Figure 7: The calculation of the coastline deviation (green) for the CET-WV coastline within the transects created by DSA. The total length of the CET-WV-extracted coastline within the Iz-Rava group is 92,762 m (92.76 km), which is significantly longer than official data [50] and coastline length extracted by another tested tool [14]. In total the CET-WV data is longer for 24,618.33 m (26.53% increase) than the coastline length derived from official state TM 1:25,000 maps. CET-WV coastline is significantly longer due to the more detailed extraction and representation of rugged coastline, which is considerably generalized in TM 1:25,000 (Figure 8). Furthermore, the CET-WV-extracted coastline was longer for 5938.07 m (6.41%) than the coastline extracted by the other tested tool from identical WV-derived models. An increase in the total coastline length of all features within the Iz-Rava island group has also affected the increase in the total area of all mapped islands, islets, and rocks (Table 5). Therefore, the increase in the total area of land features from 21,388 km\({}^{2}\) (TM 1:25,000) to 21,526 km\({}^{2}\) represents a 0.64% increase in the total land area of the Iz-Rava island group. As seen in Table 4, in some cases coastline length of some islands was longer when it was extracted by the other tested tool (Table 4), but this is exclusively the result of errors introduced by shaded areas in the multispectral image (Figure 8). While CET managed to overcome errors induced by shadows, the other tested tool falsely classified most of the shaded areas as water, thus artificially extending the total coastline of affected islands. This is further confirmed with the total area of extracted islands, which is significantly smaller for land features extracted by the other tested tool than for CET-extracted features. Falsely classified shaded areas are affecting the results of the other tested tool to such an extent that the total area of some islands (e.g., Rava, Knezak, Fulija, Tomesnjak, etc.)