---
language:
- en
license: odbl
tags:
- geospatial
- nigeria
- hospitals
- infrastructure
pretty_name: Nigeria Hospitals Accessibility Indicators
size_categories:
- 10K<n<100K
---

# Nigeria Hospitals Accessibility Indicators

This dataset provides insights into spatial accessibility to hospital services across Nigeria. It uses travel-time isochrones to calculate the population within time intervals from 10 to 120 minutes away.

## Data Structure

- **name:** Region or country name.
- **iso:** ISO3 country code.
- **id:** Unique identifier for the administrative unit.
- **country:** ISO3 country code.
- **admin_level:** Administrative level of the unit (ADM1-ADM4).
- **category:** hospitals.
- **range_type:** time.
- **range:** Time away (in seconds) from hospitals used to generate the polygon.
- **population:** Total population within the specified range.
- **population_share:** Cumulative percentage of total population.
- **population_interval:** Incremental population added in the current time band.
- **population_interval_share:** Share of the total population represented by the current interval.

## Files
- `NGA_hospitals_access_long.parquet`: Detailed interval data.
- `NGA_hospitals_access_wide.parquet`: Aggregated data per administrative unit.
- `NGA_hospitals_access.gpkg`: Geospatial polygons for the accessibility zones.

## Methodology
Accessibility is assessed using travel-time isochrones overlayed with WorldPop population data (100m resolution).

## Limitations
- **OSM Completeness:** Relies on OSM data; quality varies by region.
- **Population Estimates:** Based on statistical models (WorldPop top-down estimates), not direct census counts.
- **Travel Time Assumptions:** Models do not account for real-time traffic, seasonal weather (e.g., flooding), or road degradation.
- **Boundary Precision:** Boundaries from geoBoundaries may differ from official government demarcations.

## Source
Created using openrouteservice and OpenStreetMap data. 
HeiGIT (Heidelberg Institute for Geoinformation Technology).
[Open Healthcare Access Map](https://healthcareaccess.heigit.org/)