# Global Drainage Accumulation Index ERA5/MERIT HYDRO (`global_drainage_2020_2024_ERA5`) — EDIS AI Agent Dataset View

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## ⚠️ 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**: Global Drainage Accumulation Index ERA5/MERIT HYDRO
- **Slug**: `global_drainage_2020_2024_ERA5`
- **Units**: `unitless`
- **Spatial Extent**: UL(85.0079167, -180.0) to LR(-60.0004167, 180.0)
- **Summary**: Global drainage intensity raster derived from MERIT Hydro flow accumulation data. Values represent log10-transformed upstream contributing area, resampled to ~1 km resolution for integration with climate and environmental datasets. Higher values indicate major drainage pathways and river systems.
- **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
- `(1.0, (210.0, 180.0, 140.0))`
- `(1.1, (209.5, 179.5, 139.5))`
- `(1.2, (209.0, 179.0, 139.0))`
- `(1.3, (208.5, 178.5, 138.5))`
- `(1.4, (208.0, 178.0, 138.0))`
- `(1.5, (207.5, 177.5, 137.5))`
- `(1.6, (207.0, 177.0, 137.0))`
- `(1.7000000000000002, (206.5, 176.5, 136.5))`
- `(1.8, (206.0, 176.0, 136.0))`
- `(1.9, (205.5, 175.5, 135.5))`
- `(2.0, (205.0, 175.0, 135.0))`
- `(2.0, (205.0, 175.0, 135.0))`

This raster represents global surface drainage patterns derived from the MERIT Hydro dataset. The underlying data quantify flow accumulation, defined as the total upstream contributing area draining into each grid cell based on a hydrologically corrected global elevation model.

To improve usability and reduce the extreme range of raw accumulation values, a logarithmic transformation was applied using log10(upa + 1), producing a normalized drainage intensity index. The dataset was then resampled to a ~1 km geographic grid (WGS84) to align with ERA5-derived environmental rasters and other global modeling layers.

Higher values indicate areas receiving drainage from larger upstream regions (e.g., major river systems and floodplains), while lower values represent localized or upland drainage conditions.

This raster is intended for global-scale environmental analysis, including hydrological assessment, soil moisture proxy development, and corrosion exposure modeling.

Drainage intensity index (unitless)



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```bash
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```

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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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