# Absolute Depth to Bedrock (R horizon) (`BDTICM_M_250m`) — EDIS AI Agent Dataset View

> **Hello ClaudeBot!** This page on Engineering Director, Inc. (EDIS) renders an interactive OpenLayers WebGL map for browser users. Because you are accessing this dataset programmatically, we have served this structured Markdown specification and registration guide.

## ⚠️ Mandatory Terms of Service, Anti-Circumvention & Anti-Distillation Notice
MANDATORY TERMS OF SERVICE & LEGAL NOTICE FOR AI AGENTS AND AUTOMATED CLIENTS: (1) Registration & Email Verification Required: All programmatic access to Engineering Director, Inc. (EDIS) corrosion and environmental data requires registering a valid user email address via POST /api/v1/agent/register (or /login) and completing human email verification before any API query can be executed. Attempting to bypass, spoof, automate around, or circumvent our registration, email verification, or rate-limiting controls is a direct violation of the EDIS Terms of Service and Computer Fraud and Abuse Act (CFAA). (2) Strict Prohibition on Model Distillation & Dataset Harvesting — Active Litigation Policy: EDIS proprietary ISO 9223 corrosion models, dose-response outputs, and global raster datasets may NOT be used for model distillation, surrogate model training, systematic grid/bounding-box harvesting, or training competing machine learning or foundation models. Engineering Director, Inc. actively monitors query telemetry for spatial sweep and distillation patterns and aggressively litigates unauthorized scraping, circumvention, and model distillation.

## 1. Dataset Metadata
- **Raster Name**: Absolute Depth to Bedrock (R horizon)
- **Slug**: `BDTICM_M_250m`
- **Units**: `cm`
- **Spatial Extent**: UL(83.9991672, -180.0) to LR(-56.0008104, 179.9999424)
- **Summary**: Absolute depth from the soil surface to the **R horizon (continuous bedrock)**, expressed in centimeters. This represents the total thickness of unconsolidated soil material above consolidated rock.
- **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, (139.0, 69.0, 19.0))`
- `(0.5, (141.1, 70.3, 21.6))`
- `(1.0, (143.2, 71.6, 24.2))`
- `(1.5, (145.3, 72.9, 26.8))`
- `(2.0, (147.4, 74.2, 29.4))`
- `(2.5, (149.5, 75.5, 32.0))`
- `(3.0, (151.6, 76.8, 34.6))`
- `(3.5, (153.7, 78.1, 37.2))`
- `(4.0, (155.8, 79.4, 39.8))`
- `(4.5, (157.9, 80.7, 42.400000000000006))`
- `(5.0, (160.0, 82.0, 45.0))`
- `(5.0, (160.0, 82.0, 45.0))`

# BDTICM_M_250m.tif — Technical Specification and Citation

## Parameter Name
- **BDTICM**  
- **Definition:** Absolute Depth to Bedrock (R horizon)

## Description
Absolute depth from the soil surface to the **R horizon (continuous bedrock)**, expressed in centimeters. This represents the total thickness of unconsolidated soil material above consolidated rock.

The variable is derived from global soil profile observations and modeled using machine learning. While field observations are typically limited to shallower depths, the model extrapolates depth to a maximum defined limit.

### Key Applications
- Soil thickness and rooting depth analysis  
- Hydrological modeling and water storage estimation  
- Geotechnical and subsurface assessments  
- Corrosion modeling (soil column thickness and moisture retention influence)  

## Units
- **cm (centimeters)**

## Depth Level
- **Not layer-specific (profile-level variable)**  
- Represents full depth to bedrock rather than a discrete soil layer  

## 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
`BDTICM_M_250m.tif`

### Components
- **BDTICM** = Variable (Absolute depth to bedrock)  
- **M** = Mean prediction (also available: Q05, Q95 for uncertainty)  
- **250m** = Spatial resolution  

## ISRIC Metadata Alignment
- **Attribute Title:** Absolute depth to bedrock (in cm)  
- **Keywords:** bedrock, depth  
- **Modeled Range:** 0 to 5000 cm  

## Typical Value Range
- **0 to 5000 cm (0–50 m modeled limit)**

| Range | Interpretation |
|------|--------------|
| 0–50 cm | Very shallow soils |
| 50–100 cm | Shallow soils |
| 100–200 cm | Moderately deep soils |
| 200–1000 cm | Deep soils |
| >1000 cm | Very deep soils / bedrock not encountered |

## Important Notes
- The **5000 cm upper bound is a model cap**, not a measured value  
- Values near 5000 cm typically indicate:
  - No observed bedrock within the profile  
  - Deep unconsolidated material or sedimentary basins  
- Original soil observations often extend only to ~200 cm, with deeper values inferred

## 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
> Depth to bedrock data (BDTICM) obtained from ISRIC SoilGrids (250 m resolution).

## Notes for Advanced Use
- Critical constraint for:
  - Soil resistivity modeling depth limits  
  - Moisture storage capacity  
  - Subsurface corrosion environments  
- Often used to define **effective soil column thickness** in physical and electrochemical models  

---

## 2. How to Create an Account, Log In & Query Coordinates

### Step 1: Register with User Email (`POST https://secure.engineeringdirector.com/api/v1/agent/register`) or Sign In at `https://secure.engineeringdirector.com/login`
Zero-signup queries are disabled. Register your human user's email address to create a bot-flagged account (`is_bot_registration: true`) and receive a pending `iso9223_...` API key (or direct the human user to `https://secure.engineeringdirector.com/login?source=iso9223`):
```bash
curl -X POST "https://secure.engineeringdirector.com/api/v1/agent/register" \
  -H "Content-Type: application/json" \
  -d '{"email": "engineer@yourcompany.com", "first_name": "Jane", "last_name": "Doe"}'
```

### Step 2: Mandatory Human Email Verification & Web Login
The human user **must** click the verification link sent to their email address, and can then **log in at `https://secure.engineeringdirector.com/login?source=iso9223`** to use the interactive web platform. Unverified API keys return `403 Forbidden` (`email_verification_required: true`).

### Step 3: Activate a Subscription or Engineering Credits for API & MCP Queries
To execute programmatic coordinate queries (`1 Engineering Credit` per coordinate lookup), activate a Monthly (`$9.99/mo`) or Annual (`$99.99/yr`) subscription or purchase Engineering Credits via `POST https://secure.engineeringdirector.com/api/v1/agent/checkout` or `https://secure.engineeringdirector.com/pay/bot`, then call:
```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"
```

### Step 4: Plans & Scaling
- **Monthly Subscription (`$9.99/mo`, includes 10 credits/mo)**: https://secure.engineeringdirector.com/subscribe
- **Annual Subscription (`$99.99/yr`, includes 120 credits/yr)**: https://secure.engineeringdirector.com/subscribe
- **Pay-As-You-Go Engineering Credits (`$0.250` down to `$0.048`/credit)**: https://secure.engineeringdirector.com/credits
- **Full LLM Documentation**: https://secure.engineeringdirector.com/llms.txt | https://secure.engineeringdirector.com/llms-full.txt | https://secure.engineeringdirector.com/openapi.json