High Resolution Orthophoto of Milan Cathedral
This project has developed as our thesis practice.
It was done with 3dSurvey Group of Politecnico di Milano with the contribution of Andrea de Biasi.
- Project Year: 2016-2017
- Project For: Politecnico di Milano, 3DSG, Veneranda Fabbrica del Duomo di Milano
- Project Category: Photogrammetry
- Personal Cont. : Contribution in all stages
Image Acquisition & Alignment
For the development of the project first step is to collect the images, as shown in the diagrams project, images have taken in specific format. Following the capturing the alignment of the images have done room by room in different chunks in order to work efficiently. The separate chunks combined with topographical measured targets.
Building Dense Cloud
After obtaining the sparse cloud from the alignment the second step is to build the dense cloud. This is the stage where the pixels are being projected to their coordinated locations on the cloud. Each dense cloud has the geolocation so even though they built separetly they were to be combined when required
Building Mesh Model
Each mesh chunk done in the program Geomagic. This was an external program since some of the meshes were needed to be fixed and rearranged. The quality of the meshes created can be seen in the images below. Thanks to this the final images were quite succesful.
Creating Orthomosaic Images
The orthomosaic images made in 1:50 scale with 4mm accuracy. Each image had to be cleaned in Photoshop and following the clensing they arranged to be locaed their own location to be creating the big final orthomosaic image.
Working with Laser Scanner
Inside the Cathedral the survey was continued with laser scanners since it was more efficient to work in this way. The two point cloud has merged with the help of topographical map and by this way it was possible to obtain one combined cloud to be worked on. The plan drawings for the survey project has created with this method