# HAND Low-Lying Index (`HAND_Low_Lying_Index_0_1`) — 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**: HAND Low-Lying Index
- **Slug**: `HAND_Low_Lying_Index_0_1`
- **Units**: `Unitless (Normalized Index: 0–1)`
- **Spatial Extent**: UL(90.125, -180.0) to LR(-90.1219617, 180.1247159)
- **Summary**: The HAND Low-Lying Index is a normalized representation of terrain position derived from the HAND dataset. Values range from 0 to 1, where higher values indicate lower-lying terrain more closely connected to drainage systems and floodplains.

This index highlights areas with increased likelihood of water accumulation and persistent soil saturation.
- **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, (50.0, 205.0, 50.0))`
- `(0.005, (55.2, 210.0, 50.1))`
- `(0.01, (60.4, 215.0, 50.2))`
- `(0.015, (65.6, 220.0, 50.3))`
- `(0.02, (70.8, 225.0, 50.4))`
- `(0.025, (76.0, 230.0, 50.5))`
- `(0.03, (81.2, 235.0, 50.6))`
- `(0.035, (86.4, 240.0, 50.7))`
- `(0.04, (91.6, 245.0, 50.8))`
- `(0.045, (96.80000000000001, 250.0, 50.9))`
- `(0.05, (102.0, 255.0, 51.0))`
- `(0.05, (102.0, 255.0, 51.0))`

<h2>Technical Specifications</h2>

<h3>HAND Low-Lying Index (0–1)</h3>
<p><strong>Global | ~1 km Resolution</strong></p>

<h4>Raster Name</h4>
<p>HAND Low-Lying Index – Normalized (0–1)</p>

<h4>File Name</h4>
<p>HAND_Low_Lying_Index_0_1.tif</p>

<h4>Short Description</h4>
<p>
A normalized global index (0–1) representing the relative degree to which terrain is low-lying and hydrologically connected to drainage systems, derived from Height Above Nearest Drainage (HAND).
</p>
<h4>How to Read This Map</h4>
<ul>
  <li>This map highlights <strong>only low-lying terrain</strong> near drainage pathways</li>
  <li><strong>Sparse coverage is expected</strong></li>
  <li>Highlighted areas represent <strong>potential water accumulation zones</strong></li>
  <li>Unhighlighted areas indicate <strong>well-drained or elevated terrain</strong></li>
</ul>

<p><strong>Key Insight:</strong> Only a small portion of the landscape is truly low-lying and prone to water accumulation.</p>
<h4>Units of Measure</h4>
<p>Normalized Index (0–1, dimensionless)</p>

<h4>Technical Specification</h4>
<p>
The HAND Low-Lying Index is a normalized transformation of the HAND (Height Above Nearest Drainage) raster, designed to emphasize terrain most susceptible to water accumulation and saturation.
</p>

<p>
Lower HAND values (closer to drainage elevation) are inverted and scaled to produce higher index values, resulting in a dimensionless representation of hydrologic vulnerability.
</p>

<p>
The transformation converts terrain elevation relative to drainage into a standardized 0–1 scale:
</p>

<p><strong>Low-Lying Index = f (inverse normalized HAND)</strong></p>

<p>
Values approaching 1 represent terrain strongly connected to drainage systems (e.g., floodplains and valley bottoms), while values near 0 represent elevated, well-drained terrain.
</p>

<h4>Key Characteristics</h4>

<ul>
  <li>Derived directly from HAND (Height Above Nearest Drainage)</li>
  <li>Normalized to a 0–1 scale for model integration</li>
  <li>Highlights floodplain and low-lying terrain</li>
  <li>Provides a standardized input for hydrologic exposure modeling</li>
  <li>Strongly correlated with saturation and water retention potential</li>
</ul>

<h4>Spatial Characteristics</h4>

<ul>
  <li><strong>Coordinate System:</strong> GCS_WGS_1984</li>
  <li><strong>Spatial Resolution:</strong> ~1 km</li>
  <li><strong>Coverage:</strong> Global</li>
  <li><strong>Format:</strong> GeoTIFF / web raster</li>
</ul>

<h4>Processing</h4>

<p>
The HAND Low-Lying Index was derived from the HAND raster using normalization and inversion techniques to emphasize low-elevation terrain relative to drainage systems.
</p>

<ul>
  <li>Input: HAND (Height Above Nearest Drainage)</li>
  <li>Global normalization of HAND values</li>
  <li>Inverse scaling to highlight low-lying terrain</li>
  <li>Clipping and smoothing for global consistency</li>
  <li>Export to 0–1 normalized raster format</li>
</ul>

<h4>Interpretation</h4>

<table border="1" cellpadding="6" cellspacing="0">
  <tr>
    <th>Index Value</th>
    <th>General Interpretation</th>
  </tr>
  <tr>
    <td>0.0 – 0.2</td>
    <td>Elevated, well-drained terrain with minimal hydrologic influence</td>
  </tr>
  <tr>
    <td>0.2 – 0.5</td>
    <td>Moderately elevated terrain with limited drainage connectivity</td>
  </tr>
  <tr>
    <td>0.5 – 0.8</td>
    <td>Low-lying terrain with increasing potential for water accumulation</td>
  </tr>
  <tr>
    <td>0.8 – 1.0</td>
    <td>Floodplain and valley-bottom terrain with strong hydrologic connectivity</td>
  </tr>
</table>

<h4>Role in Pipeline Hydrologic Exposure Model</h4>

<p>
The HAND Low-Lying Index is a primary driver of the Pipeline Hydrologic Exposure Score, translating terrain elevation into a normalized indicator of hydrologic connectivity and water accumulation potential.
</p>

<p>
Higher index values contribute directly to increased exposure scoring by identifying:
</p>

<ul>
  <li>Floodplain environments</li>
  <li>Drainage-connected terrain</li>
  <li>Low-gradient accumulation zones</li>
  <li>Areas prone to persistent soil moisture</li>
</ul>

<p>
This layer supports the derivation of:
</p>

<ul>
  <li>Saturation Potential Index</li>
  <li>Drainage Position Index</li>
  <li>Pipeline Hydrologic Exposure Score (1–100)</li>
  <li>Pipeline Hydrologic Exposure Index (1–7)</li>
</ul>

<h4>Scope and Intended Use</h4>

<ul>
  <li>Identification of floodplain and low-lying terrain</li>
  <li>Hydrologic exposure screening for buried pipelines</li>
  <li>Terrain-driven saturation modeling</li>
  <li>Supporting input for corrosion exposure assessment</li>
  <li>Geospatial environmental analysis</li>
</ul>

<p>
This dataset is intended as a normalized terrain-based hydrologic indicator and should be used as part of a multi-layer exposure model.
</p>

<h4>Related Hydrologic Exposure Datasets</h4>

<h5>Primary Hydrologic Exposure Indices</h5>

<ul>
<li><a href="https://secure.engineeringdirector.com/public/map/Pipeline_Hydrologic_Exposure_Score_1_100_v14_final">Pipeline Hydrologic Exposure Score (1–100)</a></li>
<li><a href="https://secure.engineeringdirector.com/public/map/Pipeline_Hydrologic_Exposure_Index_1_7_v14_INT_websafe">Pipeline Hydrologic Exposure Index (1–7)</a></li>
</ul>

<h5>Supporting Hydrologic Input Layers</h5>

<ul>
  <li><a href="https://secure.engineeringdirector.com/public/map/HAND_Height_Above_Nearest_Drainage_m">HAND – Height Above Nearest Drainage</a></li>
  <li><a href="https://secure.engineeringdirector.com/public/map/HAND_Low_Lying_Index_0_1">HAND Low-Lying Index</a></li>
  <li><a href="https://secure.engineeringdirector.com/public/map/Saturation_Potential_Index_0_1">Saturation Potential Index</a></li>
  <li><a href="https://secure.engineeringdirector.com/public/map/Drainage_Position_Index_0_1">Drainage Position Index</a></li>
  <li><a href="https://secure.engineeringdirector.com/public/map/River_Influence_20km">River Influence</a></li>
  <li><a href="https://secure.engineeringdirector.com/public/map/Distance_To_River_20km_Geodesic">Distance to River</a></li>
  <li><a href="https://secure.engineeringdirector.com/public/map/Drainage_Index_Normalized_0_1">Drainage Intensity Index</a></li>
</ul>

<h4>Limitations</h4>

<ul>
  <li>This index is derived solely from terrain position relative to drainage.</li>
  <li>It does not account for precipitation, soil properties, or climate variability.</li>
  <li>It does not represent flood depth or flood frequency.</li>
  <li>It does not include engineered drainage systems or local infrastructure.</li>
</ul>

<h4>Legal & Licensing</h4>

<p>
© 2026 AtmosphericIQ LLC and Engineering Director, Inc. All rights reserved.
</p>

<p>
This dataset and associated models are proprietary to AtmosphericIQ LLC and distributed by Engineering Director, Inc.
</p>

<h4>Dataset Citation</h4>

<p>
Mazzella, J. (2026).<br>
<strong>HAND Low-Lying Index (0–1), Global Raster.</strong><br>
AtmosphericIQ LLC / Engineering Director, Inc.
</p>

<p>
Derived from Height Above Nearest Drainage (HAND) using normalization and inverse terrain transformation techniques.
</p>

---

## 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