Description
The MNS LiDAR HD product is the digital surface model derived from the LiDAR HD point cloud acquired under the national LiDAR HD programme with a density of at least 10 pulses per m2 and 5 pulses per m2 above 3200 m altitude. In addition to the terrain, this regular grid provides the elevation of all above-ground elements such as vegetation, buildings or structures. It is derived from the ground points, water points, low/medium/high vegetation points, buildings points and bridge deck points contained in the classified LiDAR HD point cloud. This product must cover all of metropolitan France and the DROMs (Departments and Overseas Regions except French Guiana) by 2026. You can follow the progress of the programme on the following link: acquisitionslidarhd - My IGN map and the progress of the availability of the digital surface model data here: treatmentslidarhd - My IGN card The content of these different classes is detailed in the product content description: LiDAR HD Version 1.0 - Content description (ign.fr) It is broadcast in the form of slabs of 1kmx1km and is available at the step of 50 centimeters. A 5m step version will also be available soon. The X and Y coordinates associated with the nodes of the numerical models are integer metric values in projection. These grids are written and provided in image format (Geotif). As an indication, a 32-bit GeoTiff slab weighs approximately 24 MB (for the MNS at a step of 50 cm) and 0.5 MB (for the MNT at a step of 5m). Digital models from HD LiDAR are subject to restrictions on ZICADs (Aerial Data Capture Zones) for which the information is confidential. Data is not provided on these areas in accordance with current regulations (in this case, a nodata value is used). The IGN disseminates another digital surface model data called MNS Correl. The difference between products is largely related to acquisition methodologies (image correlation on the one hand, lidar on the other) and acquisition seasonality (spring/summer for autumn/winter correlation mostly for Lidar). For more information, see the links below. Join the community of users of LiDAR HD products! Fill in the contact form available in the links below to integrate it.
Resources
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https://www.data.gouv.fr/fr/datasets/r/65dbc166-fbe9-4f72-bc3b-63e98be22e18 |
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https://www.data.gouv.fr/fr/datasets/r/4d55758f-7f32-4724-a50a-2a7e7b0e1063 |
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https://www.data.gouv.fr/fr/datasets/r/a547aa3a-26aa-4a84-8135-767fe7b9f08a |
Tags
- altitude
- nuages-de-points
- precision-altimetrique
- donnees-ouvertes
- produits-derives