Abstract
Virtual 3D city modelling has several applications such as population estimation, navigation, visibility analysis. For accurate 3D city modelling, digital elevation model (DEM) data and digital terrain models (DTMs) are used as an important input. In order to estimate accurate height of building structures, ground filtering of DEM is required in order to obtain precise DTM. In this study, satellite-derived high resolutions (1 m) DEM data over different urban regions is used as an input and four different ground-filtering algorithms, i.e. thresholding-based ground filtering, morphological operation-based filtering, slope-based filtering, multidirectional ground-filtering (MGF) algorithm are implemented for filtering of DEM. Based on the detailed analysis and evaluations, It is concluded that the MGF algorithm outperforms other algorithms with an accuracy of > 99% over all the datasets.
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Acknowledgments
The authors express sincere gratitude to Shri. N. M. Desai, Director, Space Applications Centre for guiding and permitting the publication of this paper. Authors also acknowledge Smt Sunanda Trivedi, former head, AVTD for her constant support during this work. Suggestions from internal referees to improve an earlier version of this paper are sincerely acknowledged.
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Patel, H.B., Singla, J.G. Evaluation and Analysis of Ground Filtering Algorithms for Building Height Estimation on Satellite-Based High-Resolution DEM Data. J Indian Soc Remote Sens 51, 661–672 (2023). https://doi.org/10.1007/s12524-022-01659-9
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DOI: https://doi.org/10.1007/s12524-022-01659-9