# Clay Content (%) (100–200 cm) (`CLYPPT_M_sl7_1km_ll`) — EDIS AI Agent Dataset View

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## 1. Dataset Metadata
- **Raster Name**: Clay Content (%) (100–200 cm)
- **Slug**: `CLYPPT_M_sl7_1km_ll`
- **Units**: `% (percent by weight)`
- **Spatial Extent**: UL(83.9991672, -180.0) to LR(-56.0008328, 180.0)
- **Summary**: Percentage of **clay-sized particles (< 0.002 mm)** in the soil by weight. Clay content is a key component of soil texture and strongly influences water retention, permeability, chemical reactivity, and electrical properties.
- **Included in Flagship Map Package**: `Global_ISO9223_2020_2024_LE_V4` (`GET https://secure.engineeringdirector.com/api/bundles/Global_ISO9223_2020_2024_LE_V4/point_query`)


# CLYPPT_M_sl7_1km_ll.tif — Technical Specification and Citation

## Parameter Name
- **CLYPPT**  
- **Definition:** Clay Content (Weight Percentage)

## Description
Percentage of **clay-sized particles (< 0.002 mm)** in the soil by weight. Clay content is a key component of soil texture and strongly influences water retention, permeability, chemical reactivity, and electrical properties.

## Units
- **% (percent by weight)**  
  - Range: **0–100**

## Depth Level
- **sl7 (Soil Layer 7)**  
- Depth interval: **100–200 cm**

## Data Source
- **ISRIC SoilGrids**
- Based on:
  - WoSIS (World Soil Information Service)  
  - Machine learning models (e.g., Random Forest)

## Spatial Characteristics
- **Coverage:** Global (typically excludes Antarctica)  
- **Resolution:** 1 km  
- **Coordinate System:** WGS84 (EPSG:4326)  
- **Grid Type:** Latitude/Longitude (ll)

## File Naming Convention
`CLYPPT_M_sl7_1km_ll.tif`

### Components
- **CLYPPT** = Variable (Clay content, %)  
- **M** = Mean prediction (also available: Q05, Q95 for uncertainty)  
- **sl7** = Depth layer (100–200 cm)  
- **1km** = Spatial resolution  
- **ll** = Geographic coordinate grid (latitude/longitude)  

## ISRIC Metadata Alignment
- **Variable Name:** Clay content in %  
- **Attribute Title:** Clay content (in %) at depth 1.00 m (layer midpoint representation)  
- **Range Domain:** 0 to 100  

## Typical Value Range
- **0 to 100 %**

| Value | Interpretation |
|------|--------------|
| 0–10% | Sandy / coarse-textured soils |
| 10–30% | Loamy soils |
| 30–50% | Clay loam to clay |
| >50% | Heavy clay soils |

## Important Clarification
- **100–200 cm = depth interval (sl7)**  
- **0–100 = actual raster value range (%)**  
- Values represent **weight percentage**, not volume  

## Recommended Citation

### Primary Scientific Citation
> Poggio, L., de Sousa, L.M., Batjes, N.H., et al. (2021).  
> *SoilGrids 2.0: producing soil information for the globe with quantified spatial uncertainty*.  
> **SOIL**, 7, 217–240.  
> https://doi.org/10.5194/soil-7-217-2021  

### Data Citation
> ISRIC – World Soil Information (2020).  
> *SoilGrids250m: Global gridded soil information*.  
> https://soilgrids.org  

### Example Usage Citation
> Clay content data (CLYPPT, 100–200 cm) obtained from ISRIC SoilGrids (1 km resolution).

## Notes for Advanced Use
- High clay content increases:
  - Water retention  
  - Cation exchange capacity  
  - Soil plasticity  
- Decreases:
  - Permeability  
  - Aeration  
- Critical for:
  - Soil resistivity modeling (clay lowers resistivity due to higher ion exchange capacity)  
  - Corrosion modeling (affects moisture retention and electrochemical behavior)  
  - Hydrologic and geotechnical models  

---

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```bash
curl -X POST "https://secure.engineeringdirector.com/api/v1/agent/register" \
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  -d '{"email": "engineer@yourcompany.com", "first_name": "Jane", "last_name": "Doe"}'
```

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```bash
curl -s "https://secure.engineeringdirector.com/api/bundles/Global_ISO9223_2020_2024_LE_V4/point_query?latitude={LAT}&longitude={LON}&token=iso9223_YOUR_VERIFIED_KEY"
```

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