lavenant
Engineer at IGN for over fifteen years, and a photogrammetrist by training, I specialize in the development of tools for the creation of 3D geographical data (3d urban models, DTM, DTS, etc.). Currently, I lead a team of fifteen engineers, developers and UX designers. The main function of our team is to create tools for the production of data as lidar classified, raster (oriented images, orthophoto), 3d data (3d urban models, DTM, DTS) and mobile-mapping data. We are currently heavily involved in the development of tools for the production of lidar coverage of entire France, in large part by proposing Open-Source components. We are also involved in 3D geographic data visualization as one of the main maintainers of the iTowns library (also Open-Source).
Sessions
As part of the national LiDAR HD program, IGN (French National Institute of Geographic and Forest Information) produces a 3D description of the French territory using LiDAR data, and distributes it in the form of point clouds and digital models.
The 3D point clouds captured as part of this program are first segmented into several classes (ground, water, vegetation, buildings, bridges, etc.), then transformed into DTM (digital terrain models), DSM (digital surface models) and DHM (digital height models).
To meet this challenge, IGN development teams have set up a processing chain based on Open-Source libraries (pdal, gdal, proj, etc.) and developed their own tools (A.I. classification, DTM and DSM derivation, thematic map calculation, water surface processing, etc.), most of which are Open-Source.
In detail:
* Myriad 3D: classification of point clouds using AI (https://github.com/IGNF/myria3d)
* Coclico: classification results comparison tool, agnostic of classification tools. (https://github.com/IGNF/coclico)
* CtView: calculation of thematic maps from point clouds (class maps with shading, density maps, etc.). (available soon)
* Lidro: treatment of watercourses in a lidar point cloud (to guarantee watercourse flow) (https://github.com/IGNF/lidro)
* GPAO : distribution and scheduling system for calculation (https://github.com/ign-gpao)
* ...
In this talk, we propose to first describe the whole process, then delve into the Open-Source software components we have designed and the uses of the OSGeo Open-Source libraries (pdal, gdal, proj, ...) we make in those tools.