Geographer working across spatial accessibility, public-transport data, open spatial data and reproducible data analysis.

I am particularly interested in the gap between formal or modelled accessibility and the access people can actually achieve in practice, and in building transparent analytical workflows that distinguish observed evidence from interpretation.

A reproducible technical baseline examining selected structural characteristics of a Scottish NaPTAN extract.

The analysis processed 50,893 StopPoint records and investigated the 16,275 records without supplied WGS84 coordinates. It found that all of those records retained British National Grid coordinates and could be transformed in the tested OSTN15-backed environment.

Repository:
https://github.com/mackenziereading19/Scottish_NaPTAN_Readiness_Baseline

An evidence-bounded comparison of NaPTAN public-transport records and relevant OpenStreetMap objects in Ceredigion.

The project combines deterministic identifier linkage, spatial candidate generation and manual/evidential validation. It also provides an automated current-data acquisition route for independently rerunning the computational methodology while keeping the frozen historical audit evidence separate. It deliberately avoids treating either dataset as ground truth or converting automated discrepancies directly into OpenStreetMap edits.

Repository:
https://github.com/mackenziereading19/ceredigion-naptan-osm-audit

Conditional min_transfer_time validation — PR #2175

Adds validation for the conditionally required transfers.min_transfer_time field when transfer_type = 2, with focused regression coverage and reuse of the validator's existing required-field notice.

MobilityData/gtfs-validator#2175

GTFS-RT location inheritance — PR #1811

Fixes locationless GTFS-Realtime feeds failing to inherit location metadata from referenced static GTFS feeds, including preservation and deduplication behaviour.

MobilityData/mobility-feed-api#1811

Cross-feed vehicle-type reference validation — PR #218

Adds validation that vehicle_type_id references resolve to vehicle types defined elsewhere in a GBFS feed across supported specification versions.

MobilityData/gbfs-validator#218

XY plot data-column validation — PR #48

Adds consistent validation for requested plotting columns before dispatch to the plotting backend, with regression tests across supported XY plot types.

Transport-for-the-North/caf.viz#48

Across these projects I try to use the same principles:

• establish feasibility before implementation;
• preserve and identify source evidence;
• prefer reproducible diagnostics to manual assumptions;
• distinguish discrepancies from confirmed errors;
• record limitations and negative findings;
• test changes against the smallest defensible claim.