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For the planning and sustainable development of large cities, it is critical to accurately locate and map, in 3D, existing underground\udutility networks (UUN) such as pipelines, cables, ducts, and channels. An emerging non-invasive instrument for collecting\udunderground data such as UUN is the ground-penetrating radar (GPR). Although its capabilities, handling GPR and extracting\udrelevant information from its data are not trivial tasks. For instance, both GPR and its complimentary software stack provide very\udfew capabilities to co-visualize GPR collected data and other sources of spatial data such as orthophotography, DEM or road maps.\udFurthermore, the GPR interface lacks functionalities for adding annotation, editing geometric objects or querying attributes. A new\udapproach to support GPR survey is proposed in this paper. This approach is based on the integration of multiple sources of geospatial\uddatasets and the use of a Web-GIS system and relevant functionalities adapted to interoperable GPR data acquisition. The Web-GIS\udis developed as an improved module in an existing platform called GVX. The GVX-GPR module provides an interactive\udvisualization of multiple layers of structured spatial data, including GPR profiles. This module offers new features when compared to\udtraditional GPR surveys such as geo-annotated points of interest for identifying spatial clues in the GPR profiles, integration of city\udcontextual data, high definition drone and satellite pictures, as-built, and more. The paper explains the engineering approach used to\uddesign and develop the Web GIS and tests for this survey approach, mapping and recording UUN as part of 3D city model

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

A WEBGIS TO SUPPORT GPR 3D DATA ACQUISITION: A FIRST STEP FOR THE INTEGRATION OF UNDERGROUND UTILITY NETWORKS IN 3D CITY MODELS