# Coarse fragments volumetric in % (100-200cm) (`CRFVOL_M_sl7_1km_ll`) — EDIS AI Agent Dataset View

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## 1. Dataset Metadata
- **Raster Name**: Coarse fragments volumetric in % (100-200cm)
- **Slug**: `CRFVOL_M_sl7_1km_ll`
- **Units**: `% (percent by volume)`
- **Spatial Extent**: UL(83.9991672, -180.0) to LR(-56.0008328, 180.0)
- **Summary**: Percentage of **coarse fragments (> 2 mm)** in the soil by volume, including gravel, stones, and rock fragments. This represents the proportion of soil volume occupied by non-fine-earth material.
- **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`)

### Color Table & Value Breaks
- `(0.0, (245.0, 245.0, 220.0))`
- `(0.714, (244.0, 243.3, 217.6))`
- `(1.428, (243.0, 241.6, 215.2))`
- `(2.142, (242.0, 239.9, 212.8))`
- `(2.856, (241.0, 238.2, 210.4))`
- `(3.57, (240.0, 236.5, 208.0))`
- `(4.284, (239.0, 234.8, 205.6))`
- `(4.997999999999999, (238.0, 233.1, 203.2))`
- `(5.712, (237.0, 231.4, 200.8))`
- `(6.426, (236.0, 229.7, 198.4))`
- `(7.14, (235.0, 228.0, 196.0))`
- `(7.14, (235.0, 228.0, 196.0))`

# CRFVOL_M_sl7_1km.tif — Technical Specification and Citation

## Parameter Name
- **CRFVOL**  
- **Definition:** Volumetric Percentage of Coarse Fragments

## Description
Percentage of **coarse fragments (> 2 mm)** in the soil by volume, including gravel, stones, and rock fragments. This represents the proportion of soil volume occupied by non-fine-earth material.

## Units
- **% (percent by volume)**  
  - 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)

## File Naming Convention
`CRFVOL_M_sl7_1km.tif`

### Components
- **CRFVOL** = Variable (Coarse fragments volumetric %)  
- **M** = Mean prediction (also available: Q05, Q95 for uncertainty)  
- **sl7** = Depth layer (100–200 cm)  
- **1km** = Spatial resolution  

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

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

| Value | Interpretation |
|------|--------------|
| 0–10% | Minimal coarse fragments |
| 10–30% | Moderate gravel content |
| 30–60% | High coarse fragment content |
| >60% | Very rocky soils |

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

## 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
> Coarse fragment data (CRFVOL, 100–200 cm) obtained from ISRIC SoilGrids (1 km resolution).

## Notes for Advanced Use
- High CRFVOL reduces:
  - Effective soil volume  
  - Water retention capacity  
  - Electrical conductivity  
- Important for:
  - Soil resistivity modeling  
  - Corrosion rate estimation  
  - Hydrologic and infiltration models  
- Can be converted to fraction if needed:
  - **fraction = CRFVOL / 100**

---

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