Yazar "Akça, Mehmet Devrim" için MF - Bildiri Koleksiyonu | İnşaat Mühendisliği Bölümü / Department of Civil Engineering listeleme
-
3-Dimensional pre- and post-fire comparison of forest areas
Akça, Mehmet Devrim; Stylianidis, Efstratios; Poli, Daniela; Gruen, Armin W.; Altan, Mehmet Orhan; Hofer, Martin; Smagas, Konstantinos; Martin, Victor Sanchez; Garcia, Alejandro; Jimeno, Elisa; Walli, Andreas (International Society for Photogrammetry and Remote Sensing, 2018-03-06)Forest agencies give special attention to forest fires where post-disaster loss can rarely be gauged in a quick and economic way unless an appropriate technology is adopted. Determination of the planimetric and volumetric ... -
Co-registration of 3d point clouds by using an errors-in-variables model
Akça, Mehmet Devrim; Aydar, Umut; Altan, Mehmet Orhan; Akyılmaz, Orhan (Copernicus Gesellschaft MBH, 2012-08-25)Co-registration of point clouds of partially scanned objects is the first step of the 3D modeling workflow. The aim of co-registration is to merge the overlapping point clouds by estimating the spatial transformation ... -
Determining pull - out deformations of bonded metal anchors embedded in concrete by means of photogrammetry
Akça, Mehmet Devrim; Avşar, Edip Özgür; Altan, Mehmet Orhan; Doğan, Umut Anıl (International Society for Photogrammetry and Remote Sensing, 2012)Chemical anchorages are applied in many engineering implementations, particularly strengthening of reinforced concrete structures. During strengthening procedure; chemical anchorages should be tested, since they supply to ... -
An emprical point error model for TLS derived point clouds
Akça, Mehmet Devrim; Özendi, Mustafa; Topan, Hüseyin (International Society for Photogrammetry and Remote Sensing, 2016)The random error pattern of point clouds has significant effect on the quality of final 3D model. The magnitude and distribution of random errors should be modelled numerically. This work aims at developing such an anisotropic ... -
A generic point error model for TLS derived point clouds
Özendi, Mustafa; Akça, Mehmet Devrim; Topan, Hüseyin (SPIE-Int Soc Optical Engineering, 2017-06-26)This work aims at developing a generic and anisotropic point error model, which is capable of computing magnitude and direction of a priori random errors, described in the form of error ellipsoids for each individual point ... -
Laboratory flume experiment with a coded structured light system
Akça, Mehmet Devrim; Seybold, Hansjorg (International Society for Photogrammetry and Remote Sensing, 2012)The topography of inland deltas is influenced chiefly by the water-sediment balance in distributary channels and local evaporation and seepage rates. In a previous study, a reduced complexity model has been applied to ... -
Photogrammetric deformation monitoring of the second Bosphorus Bridge in Istanbul
Avşar, Özgür; Akça, Mehmet Devrim; Altan, Mehmet Orhan (International Society for Photogrammetry and Remote Sensing, 2014)Improving the efficiency of bridge inspection and minimizing the impact of dynamic load on the long term deterioration of the bridge structure reduces maintenance and upkeep costs whilst also improving bridge longevity and ... -
Pre- and post-fire comparison of forest areas in 3D
Akça, Mehmet Devrim; Stylianidis, Efstratios; Poli, Daniela; Gruen, Armin W.; Altan, Mehmet Orhan; Hofer, Martin; Smagas, Konstantinos; Martin, Victor Sanchez; Walli, Andreas; Jimeno, Elisa; Garcia, Alejandro (Springer Berlin Heidelberg, 2019)A satellite processing platform for high resolution forest assessment (FORSAT) was developed. It generates the digital surface models (DSMs) of the forest canopy by advanced processing of the very-high resolution (VHR) ... -
A precision estimation method for volumetric changes
Akça, Mehmet Devrim; Stylianidis, Efstratios; Gruen, Armin W.; Altan, Mehmet Orhan; Hofer, Martin; Smagas, Konstantinos; Sanchez Martin, Victor; Walli, Andreas; Jimeno, Elisa; Garcia, Alejandro (IEEE, 2019-06)Earth surface changes are often computed by comparing the sequences of digital elevation models (DEMs) so called the DEM of difference (DoD) method. We present an operational DEM generation, co-registration and DoD comparison ... -
Stochastic surface mesh reconstruction
Özendi, Mustafa; Akça, Mehmet Devrim; Topan, Hüseyin (International Society for Photogrammetry and Remote Sensing, 2018-05-30)A generic and practical methodology is presented for 3D surface mesh reconstruction from the terrestrial laser scanner (TLS) derived point clouds. It has two main steps. The first step deals with developing an anisotropic ... -
Total least squares registration of 3D surfaces
Aydar, Umut; Akça, Mehmet Devrim; Altan, Mehmet Orhan; Akyılmaz, Orhan (Copernicus GmbH, 2013-10-16)Co-registration of point clouds of partially scanned objects is the first step of the 3D modeling workflow. The aim of coregistration is to merge the overlapping point clouds by estimating the spatial transformation ...