TY - JOUR A1 - Kögel, Michael A1 - Pflitsch, Andreas A1 - Northup, Diana E. A1 - Carstensen, Dirk A1 - Medley, Joseph J. A1 - Mansheim, Teresa A1 - Killing, Thomas A1 - Buschbacher, Michael A1 - Angerer, Helena A1 - Falkner, Julian A1 - Kynatidis, Achilleas A1 - Ott, Valentin A1 - Regler, Simon T1 - Combination of close-range and aerial photogrammetry with terrestrial laser scanning to answer microbiological and climatological questions in connection with lava caves JF - Applied Geomatics N2 - Combining photogrammetric reconstruction (close-range photogrammetry, CRP) and airborne photogrammetry through the structure from motion method (SFM) with terrestrial three-dimensional (3D) laser scanning (TLS), Maelstrom Cave on Big Island, Hawaii (USA), was mapped in three dimensions. The complementary properties of the two methods generated an overall model that depicted significant features of the cave both spatially and visually. Through various processes, the complex geometric quantities were derived from the model that can be used to answer microbiological and climatological questions. In this report, the procedure for the three-dimensional acquisition of the terrain surface above Maelstrom Cave as well as the interior of the cave with TLS and SFM is described. It is shown how the different data sets were combined and contrasted, including a comparison of geometries from the different survey operations. Finally, the editing processes used to quantify and simplify the cave geometry are presented, as well as the analysis of the ellipses generated accordingly to determine the geometric quantities. Through the analysis of the cave geometry, important geometric properties of the Maelstrom Cave could be quantified and categorized. In this way, an effective tool was developed to directly correlate the structure of the cave system with climatological and microbiological parameters in order to answer the corresponding questions. KW - Laser scanning ; Photogrammetry ; Lava cave ; Climatology ; Microbiology Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1007/s12518-022-00459-7 SN - 1866-9298 VL - 14 IS - 4 SP - 679 EP - 694 PB - Springer Science and Business Media LLC ER -