terrain-and-elevation SKILL.md skillA
terrain-and-elevation from yuiseki/map-from-scratch is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yuiseki/map-from-scratch/terrain-and-elevation@git:20261030.f6fcde0Pins git:20261030.f6fcde0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yuiseki/map-from-scratch
- Path
.agents/skills/terrain-and-elevation/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261030.f6fcde0, committed Oct 30, 2026
- First version recorded
- Oct 26, 2026
- Size
- 33,240 bytes
- Repository stars
- 24
- License
- GPL-3.0
What 26 map engines learnt, with numbers, about storing, decoding, shading, meshing, culling, draping onto and picking against elevation data, including what they reverted. Load it when a map-from-scratch request involves a DEM (hillshade, colour relief, contours, a tilted 3D terrain view, lines, fills or labels on terrain, height under the cursor, an elevation profile or viewshed), or before choosing an elevation encoding in bake.ts.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Terrain and elevation: bake the surface, keep the heights on the CPU Elevation touches every stage of a renderer. The encoding decides precision and whether the browser can decode it without corruption. Tile edges decide whether shading and meshes have seams. A 3D surface brings meshes, cracks between levels of detail, culling that has to know heights, overlays that must follow the ground, and a camera that must not go underground. General engines solve all of these at run time for any DEM and any camera. A renderer made for one request usually knows its DEM, its zoom range and its pitch at bake time, and can delete most of that machinery. This skill says which decisions the engines made, what they cost, and which of them a narrow request can skip. Per-engine detail is in [references/engines.md](references/engines.md); the numbers in both files refer to the Sources list at the end of this file. ## 1. Decide first: shaded 2D, or a 3D surface? - 3D terrain cost grows with pitch. On an iPhone 16 Pro Max at z12, MapLibre Native was nearly free at pitch 25 (54.8 vs 61.2 fps), but at pitch 45 it ran 40.9 vs 60.5 fps and at pitch 65 21.5 vs 53.8 fps, with …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/terrain-and-elevation@sha256:8bbed6412c87b124The line at the top of this page pins the label git:20261030.f6fcde0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_n6muhwmerap4gxy4)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Oct 26, 2026 and Oct 30, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261030.f6fcde0 latest | 2026-10-30 | f6fcde0 | 33,240 B | A | view · diff |
| git:20261027.231c915 | 2026-10-27 | 231c915 | 32,942 B | A | view · diff |
| git:20261026.79a684e | 2026-10-26 | 79a684e | 32,941 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (33240 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
yuiseki/map-from-scratch · 24 stars · license GPL-3.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_n6muhwmerap4gxy4 GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/terrain-and-elevation GET https://markdownregistry.com/api/v1/blob/8bbed6412c87b124c29b58c7f3d2612e044a8025c57fbd184bcc3ee183615be4
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.