Photographic metadata is the first step in the recording of the photogrammetry process, it comes in more than one type. This will allow point clouds and meshes to be annotated and this information used in the display of aspects of the model when required. A third is the annotation of 3D models.The second, linked to the first, is the ability to use metadata to search a repository of 3D models.This records the methods and determine a best practice. The first is to document the source files, the files created and the processes used to create those files.Metadata has a number of important uses relevant to 3D files within Archaeology and Cultural Heritage: Metadata by definition is data about data, in respect to photogrammetry it adds additional information to the photographs and 3D models. While in Cultural heritage 3D models recorded at different times could be viewed by the user by date, in an interface similar to that used in google earth, allowing comparison in preservation of areas of a monument. In archaeological excavations, the excavation could be reviewed by being able to display contexts by their metadata or by the date they were excavated showing the progress of the excavation. But how can parts of the 3D models created be selected and annotated with information about what context/architectural element they are and other important details? The answer is annotating parts of a point cloud or mesh with metadata, but what is needed to do this and what capabilities are currently in existence? And what can be done with this information once it has been created? Photogrammetry can provide a low cost method of recording Archaeological Excavations and Cultural Heritage.
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