Sammendrag
Usage of 3D photorealistic modelling of topography has dramatically increased in recent years, in large part due to developments to acquisition hardware and processing software. This is epitomised by the recent uptake in photogrammetry, driven by innovations in computer vision that have brought higher automation and reliability into the traditional processing pipeline. In geology and other geoscience disciplines, the result is an expanding variety of users and applications, making geomatics techniques fundamental to provide a spatial framework for later analysis. In addition to 3D datasets, multi-sensor data fusion combining surface shape with a new generation of imaging sensors (e.g. multi/hyperspectral, thermal, GB-InSAR) and geophysical methods add a new dimension to state-of-the-art research in geoscience applications.
Despite the current ease of acquiring and processing 3D photorealistic models, new users from outside geomatics are still faced with a steep learning curve for analysing and presenting 3D data. Interpretation tools for measuring and digitising features found in 3D textured models are critical for quantitative mapping. In addition, digitisation of field areas allows for pre-fieldwork planning and post-fieldtrip study, valuable in education for teaching concepts in e.g. geology. This contribution presents LIME, a lightweight, high performance software package for viewing and interacting with 3D models and related data types. The software has been developed for over five years, and focuses on the novel integration of disparate geospatial and field data, such as 3D models, georeferenced images and maps, logs, interpretation panels, and hyperspectral images. In addition, measurement and interpretation can be carried out by digitising in the 3D scene. Finally, high quality visual outputs can be generated, such as by projecting 3D data onto photorealistic models to generate novel texture overlay layers. These features are exemplified through using case studies in hyperspectral imaging, geophysical data integration and digital outcrop mapping.
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