A merging data tool for knowledge based photogrammetry: the case study of the castle of shawbak,Jordan
Résumé
The present paper addresses an approach for merging heritage survey and archaeological knowledge. The theoretical framework is
the integration between photogrammetric survey and documentation process, practically used in different archaeological excavation.
Merging surveyed geometries and knowledge is a complex task. Many variables have to be considered during the process of
merging. Photogrammetric survey results and knowledge can be actually seen as information. Information is sorted by source. A
source is a set of information provided by the operators involved in the excavation process. Such operators can be archaeologists,
photogrammetrists, or any other researcher (i.e. a topographist) involved in the study. The merging process involves the verification
of the consistency of different sources and the aggregation of all the information from the sources into a global result. Each source,
respectively each operator, owns a personal representation of his knowledge domain, a photogrammetrist uses geometrical primitive
and 3D representations of the object surveyed, an archaeologist has a textual and semantic representation of the objects. Merging
together all these sets of information needs a tool which can be easily operated by most of the participants in the research and which
can furthermore manage the ‘multiple knowledge' on the surveyed object. This tool, called Ametist, an acronym standing for
Arpenteur ManagEment Tool for Interactive Survey Treatment, uses a simple interface for displaying results and knowledge in
various form (textual, 2D map, 3D scene, XML). This tool can make an automatic merging of the “multiple knowledge” and its
merge engine can solve conflicts (object identification mismatch, measure of an object taken several times, spatial collisions etc.).
When conflicts cannot automatically be solved the application can report about inconsistency errors and ask a user to manually
correct the information involved. As inconsistency can be present in any information, all operators have to be able to use the
interface. The tool provides a simple easy to use interface. This document will first address the concept of knowledge based
photogrammetry (with ARPENTEUR) and then deal with a presentation of ‘Ametist'. Finally, a real case study will be considered to
highlight the first results of such a system in the frame of a French Italian scientific partnership with the “Dipartimento di Studi
storici e Geografici” of the University of Florence, in charge of the archaeological research. The selected case study is the Castle of
Shawbak, in Jordan, known in medieval written sources as the “Crac de Montréal”.
the integration between photogrammetric survey and documentation process, practically used in different archaeological excavation.
Merging surveyed geometries and knowledge is a complex task. Many variables have to be considered during the process of
merging. Photogrammetric survey results and knowledge can be actually seen as information. Information is sorted by source. A
source is a set of information provided by the operators involved in the excavation process. Such operators can be archaeologists,
photogrammetrists, or any other researcher (i.e. a topographist) involved in the study. The merging process involves the verification
of the consistency of different sources and the aggregation of all the information from the sources into a global result. Each source,
respectively each operator, owns a personal representation of his knowledge domain, a photogrammetrist uses geometrical primitive
and 3D representations of the object surveyed, an archaeologist has a textual and semantic representation of the objects. Merging
together all these sets of information needs a tool which can be easily operated by most of the participants in the research and which
can furthermore manage the ‘multiple knowledge' on the surveyed object. This tool, called Ametist, an acronym standing for
Arpenteur ManagEment Tool for Interactive Survey Treatment, uses a simple interface for displaying results and knowledge in
various form (textual, 2D map, 3D scene, XML). This tool can make an automatic merging of the “multiple knowledge” and its
merge engine can solve conflicts (object identification mismatch, measure of an object taken several times, spatial collisions etc.).
When conflicts cannot automatically be solved the application can report about inconsistency errors and ask a user to manually
correct the information involved. As inconsistency can be present in any information, all operators have to be able to use the
interface. The tool provides a simple easy to use interface. This document will first address the concept of knowledge based
photogrammetry (with ARPENTEUR) and then deal with a presentation of ‘Ametist'. Finally, a real case study will be considered to
highlight the first results of such a system in the frame of a French Italian scientific partnership with the “Dipartimento di Studi
storici e Geografici” of the University of Florence, in charge of the archaeological research. The selected case study is the Castle of
Shawbak, in Jordan, known in medieval written sources as the “Crac de Montréal”.
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