# Bhugol Web V1 — data and visual sources Bhugol Web V1 uses frozen reference data and does not acquire live observations. This record documents the sources, visual interpretation and limits of the browser experience. ## Geographic Earth — GEBCO_2026 - **Source:** GEBCO Bathymetric Compilation Group 2026 (2026), GEBCO_2026 Grid, doi:10.5285/4f68d5c7-45eb-f999-e063-7086abc036fa. Bhugol display derivative. - **Product:** https://www.gebco.net/data-products/gridded-bathymetry-data - **DOI:** https://doi.org/10.5285/4f68d5c7-45eb-f999-e063-7086abc036fa - **Terms:** https://www.gebco.net/data-products/gridded-bathymetry/terms-of-use - **Local image:** `/data/geographic.png`, 1,674,663 bytes, 2161 × 1080 pixels. - **Original accepted file:** `assets/earth/gebco_2026_signed_relief_material_v0_1.png`. - **Original and copied SHA-256:** `54d1e1376f0ff8647a7e8fb96692b1477a872e6c3b4815606afde438b1803d6e`. - **Companion provenance:** `/data/geographic.provenance.json`; exact native source manifest `/data/geographic.source.json`. The image is an unchanged copy of Native V1's audited compatibility fallback. The accepted native renderer normally prefers a larger material. The browser display uses the smaller reference, with its lower display resolution disclosed. The source grid interval is 15 arc-seconds; this derivative samples it at **10 arc-minute intervals**. The material has 2160 longitude samples plus a duplicate east seam column. Source cell centers and sampling registration are recorded in the companion manifest. Colour represents a continuous, compressed interpretation of signed terrain and bathymetry. It is not a satellite photograph, a numeric elevation measurement, or a terrain mesh with displaced heights. Display sampling, screen pixels and original source spacing are different quantities. No surveyed coastline, navigation precision or real-time conditions are implied. The Web V1 renderer keeps the exact same GEBCO image bytes and applies authored ocean, vegetation, desert and polar colours in the browser shader. These natural-looking colours are illustrative, not observed land cover or a new scientific dataset. GEBCO places the Grid and derived information products in the public domain. Its terms permit copying, publishing, adaptation, redistribution and commercial use with source acknowledgement, no implied official status or endorsement, and no misrepresentation. The product must not be used for navigation or safety at sea. It contains varied underlying data and interpolation; accuracy and completeness are not guaranteed. Bhugol Web V1 retains the GEBCO_2026 reference. There is no automatic data update. GEBCO generally releases new grids annually; changing this pin requires a separate provenance, rights, errata and browser qualification review. ## Political Earth — Natural Earth - **Source:** Made with Natural Earth. Admin 0 Countries, 1:50m, version 5.1.1, using the accepted Bhugol geography and style authorities. - **Dataset:** https://www.naturalearthdata.com/downloads/50m-cultural-vectors/50m-admin-0-countries-2/ - **Terms:** https://www.naturalearthdata.com/about/terms-of-use/ - **Boundary policy:** https://www.naturalearthdata.com/about/disputed-boundaries-policy/ - **Original geography:** `assets/data/ne_50m_world_geography_v1.json`, SHA-256 `599d68949473a252b9fd35a9b75aaccf3be1f6826e71d356e37a8d23dec9517a`. - **Original style authority:** `assets/data/ne_50m_political_style_v1.json`, SHA-256 `ab697376a55290134f7e166014b9acbb656325551f7385ec359cb0254e464074`. The accepted geography contains 242 country/territory records, 1,632 rings and 99,613 ring points. Those counts describe this frozen dataset, not a claim about the number of universally recognized sovereign states. It contains no globally adopted first-order subdivision layer. Preserve duplicate ISO identifiers and the native name-based style mapping; country records must not be silently merged by ISO code. The source uses Natural Earth's default **de facto** representation. It is not a legal boundary determination, endorsement of a territorial claim or guarantee of compliance in every jurisdiction. No new disputed boundary, claim line or alternate worldview is invented here. Colour differentiates records and carries no political meaning. The muted Bhugol palette and its cyan bias come from the accepted native visual authority. Natural Earth raster and vector map data are public domain. Its terms permit modification, electronic dissemination and commercial use without permission; upstream attribution is optional. Bhugol retains attribution for traceability. Keep the frozen source version and its classifications; no live refresh or silent data replacement is enabled. Any web rasterization or packaging derivative must retain its source hash, source classification and processing receipt. The Political view retains the exact 242 records and accepted seven-colour style. Its 2048 × 1024 material at `/data/political-006.png` (SHA-256 `9952fe8fd2a8e2470a977cf68fdf6b1f288eefc03efb215ee6e656d354ecc191`) is generated by `src/earth/PoliticalRasterizer.ts` from the verified JSON derivative; it adds a separate stroke pass over the same source rings. This avoids repeated browser rasterization. Boundary position is limited by the 2048-pixel material, unlike Native's view-space vector stroke. Political tint is attenuated on the dark hemisphere by the same UTC Sun used for Geographic shading; the line contrast remains a thematic aid and does not represent sunlight. It does not introduce subdivisions, new claims or a live political feed. The Web V1 Political view keeps that exact image, geometry, palette and night-side rule. It samples the existing mip chain with a modest negative level-of-detail bias in Political mode and reduces the overlying illustrative cloud opacity from 0.17 to 0.10. These display choices improve boundary separation at ordinary and moderate zoom without adding a texture or draw pass. They do not increase the source's geographic precision, and fine edges can still soften or shimmer at some viewing angles. ## Existing unused coastline file `/ne_110m_land.geojson` remains from the isolated website baseline. It is **unused legacy data for the new Geographic/Political rendering**, not a newly acquired or more precise coastline. Its SHA-256 is `9e0729ee253ca7d7a5c4ae9395fb1902264c5377c52e224d13dd85010e2835d9`. It is identified by the native loader and file name as Natural Earth 1:110m land. The local file does not pin an upstream archive release. Its accepted bytes are preserved; an exact upstream archive reconstruction has not been performed. The same Natural Earth public-domain terms apply. Theme information: https://www.naturalearthdata.com/downloads/110m-physical-vectors/110m-land/. ## Rendering code and visual identity The site uses Three.js 0.180.0 and Astronomy Engine 2.1.19 under MIT. Their copyright and permission notices are in `/THIRD_PARTY_NOTICES.txt`. Upstream licenses: https://raw.githubusercontent.com/mrdoob/three.js/r180/LICENSE and https://github.com/cosinekitty/astronomy/blob/master/LICENSE. Bhugol palette, style and scientific contracts are adapted under the owner's explicit Web V1 request. Their native acceptance is not a general public-domain or open-source license. The accepted native files remain unchanged. ## Lighting, motion and unavailable observations The Web V1 astronomical model calculates geocentric apparent Sun and Moon vectors, lunar illumination, phase and apparent diameters with Astronomy Engine 2.1.19. A single device-clock UTC instant drives the equatorial-of-date to Greenwich apparent sidereal Earth-fixed transform, sunlight direction, terminator, Moon phase and the positions of the visible bodies. Both bodies are placed at their calculated geocentric distances in Earth-radius scene units, with their angular diameters preserved. Camera navigation changes only the inspection viewpoint, not the instant or Earth's orientation. The model refreshes every 30 seconds and on return to the tab. It is not a precision eclipse, navigation or local topocentric sky tool: UT1/polar-motion corrections, detailed atmospheric refraction and local observer parallax are outside this display. A wrong device clock will produce wrong positions. The star points and Milky Way haze are original procedural illustrations. They are held in one inertial frame and rotated consistently with sidereal time, but they are not a measured star catalogue or calibrated Milky Way survey. Moon surface markings and clouds are procedural illustrations. The thin atmosphere is a lightweight view-angle and sunlight-dependent visual approximation, not a physical radiative-transfer solution or an observed condition. The Web V1 celestial renderer adapts the accepted Native cosmic renderer's visual principles: a textured self-luminous solar sphere with restrained limb glow, a spherical sunlit Moon, bounded daylight display gain on Earth, and a thin solar/view-angle atmosphere. Its solar granulation, lunar maria/craters, star points and galactic structure are original deterministic illustrations generated locally in the browser. The Moon's depicted near side is only approximately locked to Earth; physical libration is not rendered. The Milky Way band uses a fixed J2000 galactic-plane orientation, while its brightness and individual stars are illustrative. No Native texture, NASA image or third-party sky image was copied into this Web V1 release. Positions, apparent diameters, phase and illumination still come from the UTC astronomical model. The fixed space background has no screen-aligned lighting gradient. The current renderer uses the pale gold solar and off-white lunar material treatment observed in the owner-accepted Native app, with a narrower solar halo. The surfaces remain original procedural illustrations on 3D spheres. Native's Earth-view Moon is a phase-painted cue and its Solar System Sun is a scale diagram; neither establishes an accepted detailed lunar atlas or permission to enlarge Web's astronomical disks. The Web V1 view keeps UTC directions, phase, illumination and apparent angular sizes. The faint cloud pattern is procedural artwork, not a current observation. No current storm or lightning activity, seismic events, aircraft positions or live satellite positions are fabricated. Unknown is not zero; replay is not live; illustrative presentation is not an observation. ## Deferred assets and features Native static NASA cloud and night-light derivatives are excluded from Web V1: source-specific public reuse verification is incomplete, even though generic NASA media guidance was reviewed. No NASA image asset is used in Web V1. Generic guidance: https://www.nasa.gov/nasa-brand-center/images-and-media/. Seismic, Storm, Lightning, Cosmic Explorer, Earth Time, Evolution, Oil, India-specific detailed layers, Rail and landmarks are outside this initial browser scope. Their data and rights are not implicitly cleared by this document. LAND-01 and DIST-01 remain deferred by owner decision; R-001 remains paused. A future feature requires its own scope, source, rights, performance and accessibility assessment. No Android or other public app release is claimed. The Bhugol native app is not publicly downloadable here; its availability is shown as Coming Soon.