{ "v": 1, "fetched": "2026-10-03", "items": [ { "id": "magellan-c3mdir-colorized", "name": "Venus Magellan C3-MDIR Colorized Global Mosaic, 4641 m/px", "url": "https://asc-pds-services.s3.us-west-2.amazonaws.com/mosaic/Venus_Magellan_C3-MDIR_Colorized_Global_Mosaic_4641m.tif", "credit": "USGS Astrogeology Science Center / NASA Magellan radar team", "licence": "Public domain (US Government work, NASA / USGS)", "fetched": "2026-10-03", "transform": "GeoTIFF 8192x4096 RGB, simple cylindrical, PositiveEast, longitude domain -180..180 (x=0 is lon -180; no conversion needed). Used at native size, no tinting or toning: the 4641 m product is already 8K, so the greyscale 2025 m mosaic was not needed. 4K and 2K are Lanczos reductions. Encoded WebP q68 (8K), q75 (4K) and JPEG so every file meets the CONTRACT size budget; no gap in the colour data needed filling.", "used": [ "assets/tex/color-2k.jpg", "assets/tex/color-4k.webp", "assets/tex/color-4k.jpg", "assets/tex/color-8k.webp", "assets/tex/color-8k.jpg", "assets/fallback/poster.jpg", "assets/fallback/map-2k.jpg", "assets/og.jpg" ] }, { "id": "magellan-topography", "name": "Venus Magellan Global Topography, 4641 m/px (GTDR-based)", "url": "https://asc-pds-services.s3.us-west-2.amazonaws.com/mosaic/Venus_Magellan_Topography_Global_4641m.tif", "credit": "USGS Astrogeology Science Center / NASA Magellan altimetry team", "licence": "Public domain (US Government work, NASA / USGS)", "fetched": "2026-10-03", "transform": "int16 metres, 8193x4097, point-registered (node at lon -180 and +180), PositiveEast, label radius 6051 km. The duplicate +180 column was dropped. NoData (-32768; about 8.0 percent of pixels including the polar caps and the swath gaps) was filled with a multi-scale masked-mean pyramid plus 400 Jacobi relaxation passes on the hole pixels only (valid pixels unchanged). The point grid was averaged to a cell-centred 8192x4096 grid, then box-reduced to 4096x2048 (normal map, 1x exaggeration, R=6051.8 km) and 2048x1024 (elev-2k.png, h_m=(R*256+G)-9000) and 1024x512 (elev-1k.png, exact 2x2 integer mean). Elevations are stored as published (relative to the 6051 km datum, not re-referenced to 6051.8 km). Maxwell Montes maximum 11,394 m at 8K, about 10.1 km after the 2K box reduction.", "used": [ "assets/tex/elev-2k.png", "assets/tex/elev-1k.png", "assets/tex/normal-4k.webp", "assets/fallback/map-2k.jpg" ] }, { "id": "iau-venus-nomenclature", "name": "USGS Gazetteer of Planetary Nomenclature, Venus center points (IAU WGPSN)", "url": "https://asc-planetarynames-data.s3.us-west-2.amazonaws.com/VENUS_nomenclature_center_pts.zip", "credit": "IAU Working Group for Planetary System Nomenclature / USGS Astrogeology", "licence": "IAU names; USGS data public domain", "fetched": "2026-10-03", "transform": "Shapefile attribute table (1,985 names) read by tools/build-features.js. Longitudes converted from 0..360 east to -180..180. Kept: every Terra, Regio, Planitia and Planum; 40 hand-ranked landmarks (tools/landmarks.json); every other feature with diameter >= 20 km. Descriptor word taken from the name (Montes, Farra, Chasma).", "used": [ "data/features.json" ] }, { "id": "landmark-text", "name": "Landmark descriptions (tools/landmarks.json)", "url": "https://planetarynames.wr.usgs.gov/", "credit": "Written for this project", "licence": "Original text; facts checked against the gazetteer origin field, Magellan topography and the cited mission pages", "fetched": "2026-10-03", "transform": "Diameters are IAU gazetteer values. Elevation figures were measured from the Magellan topography above; mission and name-origin facts are from the gazetteer.", "used": [ "tools/landmarks.json", "data/features.json" ] }, { "id": "mission-facts", "name": "Mission records (landing sites, dates, survival times, T and P)", "url": "https://en.wikipedia.org/wiki/Venera", "credit": "Per-item src fields in data/missions.json: Wikipedia mission pages (citing Soviet and NASA literature), mentallandscape.com for Venera 10 to 12 surface T/P, JAXA, ESA and NASA mission pages for Akatsuki, EnVision, DAVINCI and VERITAS", "licence": "Facts only; no text copied. Wikipedia text is CC BY-SA, not reproduced.", "fetched": "2026-10-03", "transform": "NSSDCA master-catalog pages returned errors to the fetch tool, so landing coordinates come from Wikipedia infobox values and Vega literature coordinates (Bindschadler 1986, Preston 1986). Where sources disagree (Vega landers, Venera 7, 11, 12) the item carries approx=true. Atm values were converted to bar (x1.013).", "used": [ "data/missions.json" ] }, { "id": "orbit-elements", "name": "Orbit elements", "url": "https://en.wikipedia.org/wiki/Magellan_(spacecraft)", "credit": "Per-orbit src fields in data/orbits.json", "licence": "Facts only", "fetched": "2026-10-03", "transform": "Periapsis/apoapsis/inclination/period from the cited pages; RAAN chosen for display; argument of periapsis computed to reproduce the stated periapsis latitude (sin lat = sin i sin w, using 180 - w).", "used": [ "data/orbits.json" ] }, { "id": "vega-balloon-tracks", "name": "Vega 1 and 2 balloon tracks", "url": "https://en.wikipedia.org/wiki/Vega_1", "credit": "Sagdeev et al. 1986; Preston et al. 1986 (via the cited mission pages)", "licence": "Facts only", "fetched": "2026-10-03", "transform": "60 points interpolated along a constant-latitude westward drift from the published release point to the published end point (Vega 1: 68.8 E) or the published 11,100 km extent (Vega 2). Marked approx.", "used": [ "data/traverses.json" ] }, { "id": "vira", "name": "Venus International Reference Atmosphere (VIRA), Seiff et al. 1985", "url": "https://en.wikipedia.org/wiki/Atmosphere_of_Venus", "credit": "Seiff, A. et al. 1985, in Kliore et al. (eds), Venus International Reference Atmosphere, Adv. Space Res. 5(11)", "licence": "Facts only (numerical model values)", "fetched": "2026-10-03", "transform": "Low-latitude T and P at 5 km spacing (0 to 70 km, then 80, 90, 100 km) as tabulated at the cited page; 2 km rows interpolated (PCHIP in T, linear in ln P); density computed; wind and cloud layers from the literature, approximate.", "used": [ "data/atmosphere.json" ] } ] }