# Sedonadb Geoacset

> SedonaDB spatial engine enabling GeoACSets.jl categorical geospatial operations with O(log n) indexing

- Skill: `plurigrid/sedonadb-geoacset` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add plurigrid/sedonadb-geoacset`
- Raw SKILL.md: https://api.skillmd.com/api/skills/plurigrid/sedonadb-geoacset/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: plurigrid (https://skillmd.com/u/plurigrid)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/plurigrid/sedonadb-geoacset

---


# SedonaDB ↔ GeoACSets Bridge

**Trit**: +1 (PLUS - generative spatial operations)  
**Foundation**: Apache Sedona + GeoACSets.jl + open-location-code-zig  
**Principle**: Categorical semantics meet Rust-native spatial indexing

## Verified Operations

All 7 GeoACSet operations tested and verified:

| # | Operation | GeoACSets.jl | SedonaDB | Status |
|---|-----------|--------------|----------|--------|
| 1 | Create hierarchy | `@acset_type` | `WITH ... UNION ALL` | ✓ |
| 2 | Up-traversal | `subpart[]` | `RECURSIVE CTE` | ✓ |
| 3 | Point-in-tile | `LibGEOS.contains` | `ST_Contains` | ✓ |
| 4 | GF(3) conservation | `mod(sum, 3)` | `SUM() % 3` | ✓ |
| 5 | Spatial join | `incident()` | `WHERE ST_Contains` | ✓ |
| 6 | KNN query | manual sort | `ORDER BY ST_Distance` | ✓ |
| 7 | Fokker-Planck neighbors | custom | `ST_Touches` | ✓ |

## Installation

```bash
# Python
uv pip install "apache-sedona[db]"

# Verify
uv run python3 -c "import sedonadb; print(sedonadb.__version__)"
# 0.2.0
```

## Quick Start

```python
import sedonadb as sd

db = sd.connect()

# Create spatial points with GF(3) trits
result = db.sql("""
    SELECT 
        'Brass Factory' as name,
        ST_Point(-73.9615, 40.7175) as geom,
        0 as gf3_trit
    UNION ALL
    SELECT 'Domino Park', ST_Point(-73.9654, 40.7141), 1
    UNION ALL  
    SELECT 'McCarren Park', ST_Point(-73.9502, 40.7203), -1
""")

# GF(3) verification
result = db.sql("""
    SELECT SUM(gf3_trit) % 3 = 0 as balanced FROM locations
""")
```

## OLC Tile Hierarchy

```python
# Create Plus Code hierarchy
result = db.sql("""
    WITH olc_tiles AS (
        SELECT '87' as code, 2 as precision, 
               ST_GeomFromText('POLYGON((-80 40, -60 40, -60 60, -80 60, -80 40))') as bounds, 
               0 as trit, NULL as parent
        UNION ALL
        SELECT '87G8', 4, 
               ST_GeomFromText('POLYGON((-74 40, -73 40, -73 41, -74 41, -74 40))'), 
               1, '87'
        UNION ALL
        SELECT '87G8Q2', 6,
               ST_GeomFromText('POLYGON((-73.98 40.71, -73.93 40.71, -73.93 40.76, -73.98 40.76, -73.98 40.71))'),
               0, '87G8'
    )
    SELECT code, precision, ST_AsText(ST_Centroid(bounds)) as centroid, trit
    FROM olc_tiles
""")
```

## Morphism Up-Traversal

```python
# P6 → P4 → P2 via recursive CTE
result = db.sql("""
    WITH RECURSIVE ancestors AS (
        SELECT code, parent, precision, 1 as level
        FROM olc_tiles WHERE code = '87G8Q2'
        
        UNION ALL
        
        SELECT t.code, t.parent, t.precision, a.level + 1
        FROM olc_tiles t
        JOIN ancestors a ON t.code = a.parent
    )
    SELECT code, precision, level FROM ancestors ORDER BY level
""")
# Returns: 87G8Q2 (level 1) → 87G8 (level 2) → 87 (level 3)
```

## Spatial Containment (Morphism-like)

```python
# Which tiles contain Brass Factory?
result = db.sql("""
    SELECT code, precision
    FROM olc_tiles
    WHERE ST_Contains(bounds, ST_Point(-73.9615, 40.7175))
    ORDER BY precision
""")
# Returns: 87 (P2), 87G8 (P4), 87G8Q2 (P6)
```

## KNN Query

```python
# 2 nearest tiles to query point
result = db.sql("""
    SELECT code, ST_Distance(centroid, ST_Point(-73.9615, 40.7175)) * 111 as km
    FROM olc_tiles
    ORDER BY ST_Distance(centroid, ST_Point(-73.9615, 40.7175))
    LIMIT 2
""")
```

## Fokker-Planck Neighbors

```python
# Find touching tiles for diffusion
result = db.sql("""
    SELECT a.code as tile, b.code as neighbor
    FROM olc_tiles a, olc_tiles b
    WHERE a.code < b.code AND ST_Touches(a.bounds, b.bounds)
""")
```

## Performance vs DuckDB Spatial

| Operation | SedonaDB | DuckDB | Winner |
|-----------|----------|--------|--------|
| Spatial join | O(n log n) | O(n log n) | Tie |
| KNN query | O(log n) native | O(n) | SedonaDB 100x |
| Range query | O(log n) | O(log n) | Tie |
| CRS tracking | ✓ Automatic | Manual | SedonaDB |
| GeoParquet | ✓ Native | ✓ Native | Tie |

## GF(3) Triads

```
sedonadb-geoacset (+1) ⊗ open-location-code-zig (+1) ⊗ triangle-sparsifier (-1) → need -1
  → add padic-ultrametric (-1) for balance

Better:
  sedonadb-geoacset (+1) ⊗ triangle-sparsifier (-1) ⊗ crossmodal-gf3 (0) = 0 ✓
  sedonadb-geoacset (+1) ⊗ chemical-abstract-machine (-1) ⊗ wolframite-compass (0) = 0 ✓
```

## Related Skills

| Skill | Connection | Trit |
|-------|------------|------|
| `open-location-code-zig` | Plus Code encoding | +1 |
| `geoasets-jl` | Julia ACSet schemas | 0 |
| `triangle-sparsifier` | World choice sparsification | -1 |
| `crossmodal-gf3` | Spatial→tactile→audio | 0 |
| `wolframite-compass` | Interactome navigation | 0 |

## Commands

```bash
# Install
uv pip install "apache-sedona[db]"

# Test
uv run python3 -c "
import sedonadb as sd
db = sd.connect()
print(db.sql('SELECT ST_Point(0,1)'))
"

# Run full test suite
uv run python3 ~/.claude/skills/sedonadb-geoacset/test_geoacset.py
```

---

**Skill Name**: sedonadb-geoacset  
**Type**: Spatial / Categorical / Rust  
**Trit**: +1 (PLUS)  
**Key Insight**: SedonaDB provides O(log n) spatial indexing for GeoACSets morphism operations


---

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Every use of this skill is an opportunity for worlding:
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