projection-and-globe SKILL.md skillA
projection-and-globe 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/projection-and-globe@git:20261026.79a684ePins git:20261026.79a684e 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/projection-and-globe/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261026.79a684e, committed Oct 26, 2026
- Size
- 31,504 bytes
- Repository stars
- 24
- License
- GPL-3.0
What 38 map engines learnt about where projection math should live (bake time, CPU, or shader), float32 precision at street zoom, curved edges, the antimeridian and the poles, and the extra machinery a globe needs (horizon clipping, culling, per-tile LOD, label occlusion, near/far). Load it when a map-from-scratch request involves choosing a projection, world-scale or Pacific/polar data, a globe or pitched 3D view, zooming to street level over large coordinates, run-time raster reprojection…
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
# Projection and globe: where the projection math lives Every renderer turns lon/lat into pixels somewhere. The general engines do it at run time, for any projection and any camera, and most of their history in this area is about what that costs: float32 runs out at street scale, straight edges must bend, the antimeridian and the poles break naive code, a globe needs its own clipping, culling and level of detail, and every extra projection touches subsystems that assumed one rectangular world. This repository already projects at bake time so the renderer only applies an affine camera [115][116]. This skill covers what is left to decide after that, how to tell when a request needs projection at run time (a globe, a pitched view, street zoom over a world), and what the engines learnt when they did it. Per-engine detail is in [references/engines.md](references/engines.md); the numbers in brackets point to the Sources list at the end of this file. Neighbouring skills go deeper on two parts: `float-precision` (coordinate frames and attribute types in general) and `tile-lod-and-overzoom` (tile choice under pitch and on a globe). …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/projection-and-globe@sha256:553c6241516d5ab4The line at the top of this page pins the label git:20261026.79a684e, 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_hvkp2k3com3gkj7y)
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Versions
The registry has recorded 1 version of this file, committed on Oct 26, 2026.
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 (31504 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_hvkp2k3com3gkj7y GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/projection-and-globe GET https://markdownregistry.com/api/v1/blob/553c6241516d5ab42f4bb29ec9e4c7aead78e6f15fb8d35fa3dd537da86d0480
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.