docs: explorations — 3D from imagery, tile enhancement, neural textures, ML on WebGPU/wgpu (research notes) - #47

Raster imagery + terrain tile -> plausible 3D scene (relief, buildings,
trees, structures), judged on credibility rather than accuracy. Covers
monocular height, off-nadir and shadow cues, satellite neural fields,
global height products, footprints and roof structure, LoD2, completion
trained with holes, facades, vegetation, shadow removal, satellite-to-city
generation, inverse procedural modeling and 3D foundation models; plus
reference datasets, licensing constraints, credibility metrics, a sketch
pipeline and experiments. Nothing implemented.

The earlier mesh-based note now points to it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhevLiW3dUtveoxxmG9fg3

…nable in Tuile

Detail and super-resolution, cross-zoom consistency, hallucination
measurement, deblurring/MTF, denoising, JPEG artifact removal, all-in-one
restoration, white balance, exposure/tone (LUT and bilateral-grid fields),
colour transfer and multi-source harmonisation, colour science, haze,
atmospheric correction, cloud removal and compositing, seasons, transient
objects and inpainting, and quality assessment. Complements doc 18.

Opens with what is actionable: three render-side fixes in our own chain
(anisotropic sampling in the viewer, linear-light mips, reprojection
kernel), then offline enhancement stored as a derived layer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhevLiW3dUtveoxxmG9fg3

…ramids

Neural texture compression (NTC and its BC-latent descendants), filtering
of neural textures, the GPU substrate (cooperative vectors/matrices,
wgpu 29, WebGPU f16 and subgroups), learned image codecs and scalable
coding, implicit neural representations and overfitted codecs, 2D
Gaussian images, geospatial fields and embedding tiles. Judged against
tile constraints (borders, parent/child consistency, never black,
determinism, static view, RGB only, encode throughput), with tracks and
experiments for Tuile.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhevLiW3dUtveoxxmG9fg3

webgpu-neural-networks.md: platform support (Linux the gap), JS runtimes
(ORT-Web, Transformers.js, LiteRT.js, WebLLM, WebNN), the Rust ecosystem
(Burn/CubeCL device sharing, versions checked on crates.io), compilers
emitting WGSL, interop, published trials by model class, dispatch overhead
as the bottleneck, limits and features, kernels, numerics, deployment, and
guidance and experiments for a Rust/wgpu engine.

onnx-webgpu-wgpu.md: ONNX essentials (opsets, contrib ops, external data,
quantization, export), ONNX Runtime Web and native WebGPU EP (Dawn),
Rust ONNX paths (burn-onnx, ort/ort-web, tract, RTen, candle, wonnx),
ONNX-to-WGSL compilers, pitfalls, and a recommendation per target.

Checked in published sources: wgpu 29.0.3 exposes no way to extract or
adopt a JS GPUDevice (backend module private), so JS runtimes cannot share
Tuile's device; cubecl-wgpu 0.10 is on wgpu 29, 0.11 on wgpu 30.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhevLiW3dUtveoxxmG9fg3

…yers

A derived layer is a pure function of source tiles (tile, halo, parent,
other dates) and a versioned model, computed on first request, stored and
served like any layer. In tuile-tile-server the GPU worker is just another
Upstream; the client always shows the raw tile and swaps when the derived
one is resident. Covers the three tiers (browser, proxy, farm), naming,
determinism and provenance, licences (stored derivatives for open or own
sources only), a cost model to fill by measurement, and open questions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhevLiW3dUtveoxxmG9fg3

…deepest imagery level, measured on the pyramid's own (z, z+1) pairs

…ithout the URL list

…ivate notebook

…eepest imagery level — dataset of damaged and cross-level pairs, before/after browser

…2026-10-15