Many monuments have been identified in the previous study. The main aim of the project is to obtain detailed plans of all buildings, of the fortified city on a large area of 1200m². So, we use the latest techniques of 3D photogrammetry from aerial photography. With accurate photographical coverage (approximately 2000 aerial photos with high precision sensor (more than 20MG pixels on zones of 40X40mètres), we will obtain an accuracy close to 10 cm (thanks to the work of qualimetry and georeferencing topography). So we can get a full and textured 3D model of the site, monuments and fortifications. We can draw the plans, sections and orthophotos from each building for this model and also the digital terrain model (DTM) to obtain the topographic map of the site and its surroundings with the nearby river. Thanks to the accuracy of the model, we will be able to identify and interpret the archaeological clues of the topography (walls, roads, lands) and restitute the orientations of walls and streets to draw the urban plan of the city, now lost in the field. Plans, sections and orthophotos of buildings and fortification we will permit to do the archaeological study.

https://www.youtube.com/watch?v=zkGrIzmKWWw&feature=youtu.be

This innovative technique will be an experiment used for the project first time in India. It will allow us to get maximum spatial information and textures in a short field time in compare of others methods (survey architecture (not accurate enough for planning or statement of destroyed elevations), the tacheometer survey (too long for the proposed area), or LIDAR scanner survey (too expensive). The processing time is relatively long as it need a powerful computer for calculations process of photos and topography benchmarks to create the 3D cloud, then mesh, and finally the texture. Then, we must adjust the 3D model obtained (correction, scaling, quality, georeferencing), then 3D post processing operations (creation of DTM, contours, plans and sections of buildings) and then study development (study slopes for the street restitutions), the study of fortification and buildings (orthophotos, plans and sections).
Finally, we have the opportunity to create restitution of mains buildings from the 3D model (palace complex, hammams, Jama Masjid (built in 1406).

https://www.youtube.com/watch?v=XEDDD9pXjmU

Creation of point cloud from photographs. Shooting must follow a parallel progress to the wall that you want to model (represented by each blue rectangle). The algorithms get the common dots between three pictures, creating the cloud in 3D. Torgal site, Karnataka, India, Mission 2014 LA3M - Malik Sandal Institute of Architecture of Bijapur.

Tournay_coupe-1416456131

Exploration archéologique de la cité de Firozabad en Inde (Décembre 2014)