PHspdata: Philippine Administrative Boundaries

Spatial dataset of Philippine administrative boundaries (levels 0–4).

Source: Boundaries are sourced from the Humanitarian Data Exchange (HDX), originally provided by the Philippine Statistics Authority (PSA) and NAMRIA (last official update: November 2023).

Custom Updates:

Negros Island Region (NIR): This package includes a manually updated administrative hierarchy to reflect the re-establishment of the NIR (RA 12000). The provinces of Negros Occidental, Negros Oriental, and Siquijor have been reassigned to this region within the dataset.

License: The data is provided under CC BY 3.0 IGO. The package structure and helper function are licensed under MIT.

Modifications:

Consistent with the CC BY-IGO license, the following modifications were performed:

Geometry Simplification: Reduced to 2% of original vertex density using mapshaper.

Administrative Correction: Manually updated ADM1 attributes to include the Negros Island Region (NIR).

Precision: Coordinates rounded to 5 decimal places.

Cleaning: Retained essential hierarchical columns (ADM0 through ADM4).