sweetapricity/bridgedeck-coastal

Bridgedeck — Coastline Reference Data (Natural Earth 10m)

Part of the bridgedeck dataset collection for US bridge deck deterioration research.

⚠️ Pipeline dependency — This dataset is a reference file used by the bridgedeck ETL pipeline to compute coastal distance features for bridges. It is not a primary research dataset. See sweetapricity/bridgedeck-nbi for the main bridge dataset.

Overview

Natural Earth 10m resolution coastline shapefile, used to compute the distance from each US bridge to the nearest coastline. This distance is a proxy for marine chloride exposure — a key chemical deterioration driver for coastal bridges (salt spray, tidal flooding, high humidity).

Source

Source: Natural Earth Product: ne_10m_coastline — 10m physical coastline vectors License: Public domain

Contents

File	Description
ne_10m_coastline.zip	Natural Earth 10m coastline shapefile (zipped)

How It's Used

The bridgedeck ETL script src/bridgedeck/etl/coastal_clean.py:

1. Loads this shapefile
2. Projects to EPSG:5070 (Albers Equal Area CONUS) for accurate km distances
3. Computes nearest distance from each bridge lat/lon to the coastline
4. Derives dist_to_coast_km and marine_exposure_flag (< 50 km threshold)

Output: data/interim/coastal/coastal_features.parquet — one row per bridge.

Features Derived

Feature	Description
dist_to_coast_km	Distance to nearest coastline segment (km)
marine_exposure_flag	True if dist_to_coast_km < 50 km

Related Datasets

Repo	Type	Description
sweetapricity/bridgedeck-nbi	Primary	National Bridge Inventory — structural features
sweetapricity/bridgedeck-prism	Primary	PRISM climate features
sweetapricity/bridgedeck-noaa	Primary	NOAA storm event counts
sweetapricity/bridgedeck-nshm	Primary	USGS seismic hazard
sweetapricity/bridgedeck-salt	Primary	USGS road salt tiers
sweetapricity/bridgedeck-coastal	Dependency	This dataset — coastline reference
sweetapricity/bridgedeck-elevation	Dependency	USGS elevation at bridge locations