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).