DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 11-12/2018 str. 15 <-- 15 --> PDF |
Direct comparison with other similar studies (Felicísimo et al., 2004; López, 2002; Schultz et al., 1999; Tran et al., 2014) is hindered due to a number of differences between input data, DTMs resolutions, land cover type, and validation data. Yet, the methods presented in the previous studies improved the DTM accuracy, i.e. decreased the RMSE for 2% (Felicísimo et al., 2004), >2% (López, 2002), 21% (Tran et al., 2014), and 27% (Schultz et al., 1999). This study suggests an accuracy improvement as the RMSE values decreased by 8% and 50% in the two subset areas for which the validation was conducted. Considering the fact that, unlike our study, neither of the mentioned studies was dealing with the improvement of DTM accuracy in forested areas, the obtained results of this research add to the significance of the research. Moreover, to the best of our knowledge, this is the first study that proposes the automatic method for the vertical accuracy improvement of the DTMPHM in forests. Knowing the structure and characteristics of photogrammetrically derived DTMs (e.g. low density of points, lower accuracy) in forested areas of Croatia, one should keep in |