{"name": "Zones d'influence visuelle (ZIV)", "package_name": "ZIV_prime", "description": "Visual influence zones (viewsheds) computed from national LiDAR elevation data: downloads the tiles covering an area of interest, merges them, computes the viewshed and loads the result styled in the project. Two countries: France (IGN LiDAR HD) and the contiguous United States (USGS 3DEP terrain, LANDFIRE vegetation height, USA Structures buildings, TIGER/Line roads). The country is detected from the area of interest, or forced from the form.", "about": "Visual Influence Zones computes viewsheds - zones of visual influence, also called ZTV or ZVI in landscape impact assessment - for a project site, from high-resolution national LiDAR elevation data. Typical use: assessing how far, and from where, a planned installation (solar farm, wind turbines, buildings) would be visible in the surrounding landscape.\nGiven an area of interest, the plugin lists and downloads the elevation tiles that intersect it, merges and resamples them, computes the viewshed over the resulting terrain, and masks out woodland and buildings. The resulting raster is loaded into the project with a ready-made \"night\" styling. It can optionally suggest photo viewpoints for photomontages, spread evenly across disjoint visible patches and across distance rings, and placed on roads or close to buildings rather than in the middle of a field.\nThis version covers two countries. France draws on the IGN LiDAR HD data published by the French National Geographic Institute, exactly as the parent plugin does. The contiguous United States draws on the USGS 3DEP elevation service for the terrain, LANDFIRE LF2023 existing vegetation height and canopy height for the occluding surface, FEMA/ORNL USA Structures for buildings and Census TIGER/Line for roads. The country is chosen from a \"Country\" field on the form, whose default deduces it from the centroid of the area of interest; an explicit choice always wins over the detection.\nWhere the United States has no 1-metre LiDAR project - which is a matter of survey coverage, not of terrain: parts of Olympic National Park have none while the Nevada desert does - the terrain is served at 1/3 arc-second, about 10 metres, and the working resolution is raised to match instead of being interpolated up from coarser data. The log says so, so that a viewshed computed on a smoothed terrain is never mistaken for a fine one.\nThe American chain is exercised end to end by its own test bench across five contrasting areas, on both supported QGIS versions. The France chain is the one this plugin has always shipped, unchanged.\nThe visibility algorithms ship with the plugin as an internal Processing provider, so no companion plugin has to be installed. The only Python dependencies are requests and numpy, both already bundled with QGIS.\nThe two-country chain grew as a separate line from version 1.5.3 of this plugin, so that the France chain kept running untouched while the American side was built, and was folded back in at 1.6.0 under the original identities: people already using the plugin receive an update, and find their stored preferences where they left them. Every fix shipped in the single-country line up to 1.5.6 is carried here. All of its code - tile import (import_dalles/), visibility engine (moteur_visibilite/), Processing algorithms (algorithmes_ziv/) and orchestration - is original code; no third-party code is included.\nReleased under the GNU General Public License v3 or later; see the LICENSE file shipped with the plugin. Elevation and landcover data for France (c) IGN, Licence Ouverte / Open Licence.", "homepage": "https://github.com/VDEGREG/ZIV", "repository": "https://github.com/VDEGREG/ZIV", "tracker": "https://github.com/VDEGREG/ZIV/issues", "author": "G. DELSIGNE", "tags": ["viewshed", "visibility", "visual impact", "lidar", "lidar hd", "ign", "dem", "dtm", "dsm", "elevation", "terrain", "france", "ziv", "ztv", "zvi", "usa", "3dep", "landfire"], "downloads": 275, "latest_version": "1.5.5", "versions": [{"version": "1.5.5", "experimental": false, "qgis_min": "3.34.0", "qgis_max": "4.99.0", "downloads": 91, "uploaded_by": "VDEGREG", "upload_datetime": "2026-09-10T02:52:07.503927"}, {"version": "1.5.3", "experimental": false, "qgis_min": "3.34.0", "qgis_max": "4.99.0", "downloads": 61, "uploaded_by": "VDEGREG", "upload_datetime": "2026-09-04T09:18:37.110457"}, {"version": "1.2.3", "experimental": false, "qgis_min": "3.34.0", "qgis_max": "4.99.0", "downloads": 123, "uploaded_by": "VDEGREG", "upload_datetime": "2026-08-27T08:37:15.503809"}]}