Presentation of the web based ARPENTEUR tools: towards a Photogrammetry based Heritage Information System.

Abstract

The paper presents the current state of the ARPENTEUR project (ARchitectural PhotogrammEtry Network Tool for EdUcation and <br />Research), and principally the new photogrammetric module, the 3D measuring and modelling module including an automatic DSM <br />densification tool and the formalization of photogrammetric data in XML. <br />This JAVATM based package has been proposed as a WEB tool since 1998. It is now also available as standard software running on <br />Windows or Linux platforms. <br />Several significant ideas are supporting this project: <br />- The photogrammetric module has been based on the orientation of couples of images (not necessarily stereo pairs, and not <br />necessarily from metric cameras) and well known steps of interior and exterior orientation. Image processing functions from the Java <br />Advanced Imaging Library as well as an area based correlation method for the measurements of homologous points are included. <br />- A semi-automated Primitive Measurement Method called I-MAGE (Image processing and Measure Assisted by GEometrical <br />primitive) has been proposed for the geometric measurement of 3D model. This method is based on the coupling of image <br />correlation and geometric primitive computation as planes, cylinders, cones and sphere shapes of the object. Five methods of <br />generating DSM automatically are completing the previous modules. These methods based on feature point extraction techniques, <br />well known in aerial photogrammetry, have been adapted to close range projects in Arpenteur. Encouraging results have been <br />obtained. <br />- The last important point is the choice of XML to formalize object data, as well as photogrammetric data. Automatic links are <br />generated between the 3D representation of the measured object and the XML formalization of the photogrammetric, dimensional <br />and more general semantic data of a project. As the data in XML can be parsed and queried, the links between textual data and <br />graphical representation can be considered as the first step towards an information system dedicated to architecture and archaeology.