# Bulk Density (Fine Earth) (0-200cm) (`BLDFIE_M_sl7_1km_ll`) — EDIS AI Agent Dataset View

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## 1. Dataset Metadata
- **Raster Name**: Bulk Density (Fine Earth) (0-200cm)
- **Slug**: `BLDFIE_M_sl7_1km_ll`
- **Units**: `kg/m³`
- **Spatial Extent**: UL(83.9991672, -180.0) to LR(-56.0008328, 180.0)
- **Summary**: Bulk density of the fine earth fraction (<2 mm) expressed in kg/m³, representing the oven-dry mass of soil per unit volume at standard depth intervals. This property influences soil porosity, water retention, and subsurface transport processes and is a key parameter in modeling electrical resistivity and corrosion behavior.
- **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
- `(50.0, (210.0, 180.0, 140.0))`
- `(65.0, (208.5, 178.0, 138.0))`
- `(80.0, (207.0, 176.0, 136.0))`
- `(95.0, (205.5, 174.0, 134.0))`
- `(110.0, (204.0, 172.0, 132.0))`
- `(125.0, (202.5, 170.0, 130.0))`
- `(140.0, (201.0, 168.0, 128.0))`
- `(155.0, (199.5, 166.0, 126.0))`
- `(170.0, (198.0, 164.0, 124.0))`
- `(185.0, (196.5, 162.0, 122.0))`
- `(200.0, (195.0, 160.0, 120.0))`
- `(200.0, (195.0, 160.0, 120.0))`

Bulk Density (Fine Earth) (BLDFIE)

# BLDFIE sl7 Soil Profile — Technical Specification and Citation

## Parameter Name
- **BLDFIE**  
- **Definition:** Bulk Density of Fine Earth  

## Description
Bulk density of the **fine earth fraction** (< 2 mm particles). It represents the mass of oven-dried soil per unit volume, excluding coarse fragments.

### Key Applications
- Soil compaction analysis  
- Root penetration modeling  
- Water retention and hydraulic conductivity estimation  
- Soil carbon stock calculations  
- Inputs for resistivity and corrosion modeling  

## Units
- **kg/dm³** (equivalent to **g/cm³**)

## Depth Level
- **sl1 (Soil Layer 1)**  
- Depth interval: **0–200 cm**

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

## Spatial Characteristics
- **Coverage:** Global (typically excludes Antarctica)  
- **Resolution:** 250 m  
- **Coordinate System:** WGS84 (EPSG:4326)

## File Naming Convention (Typical)
`BLDFIE_M_sl7_1km_ll.tif`

### Components
- **BLDFIE** = Variable (Bulk Density Fine Earth)  
- **M** = Mean prediction (also available: Q05, Q95 for uncertainty)  
- **sl1** = Depth layer (0–5 cm)  
- **250m** = Spatial resolution  

## Typical Value Range
- **~0.8 to 1.8 kg/dm³**

| Range | Interpretation |
|------|--------------|
| Low values | Organic-rich, loose soils |
| High values | Compacted, mineral soils |

## 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
> Bulk density data (BLDFIE, 0–5 cm) obtained from ISRIC SoilGrids (250 m resolution).

## Notes for Advanced Use
BLDFIE is commonly used to derive:
- Soil porosity  
- Volumetric water content relationships  
- Resistivity modeling inputs (e.g., Archie-type relationships)  
- Soil structure and compaction indicators  


---

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