Developed by Sebastian Madrid Ontiveros to support hydraulic modellers in Scotland building 1D-2D hydraulic models and flood risk assessments. Provides a pure Ruby interface for listing and downloading Scottish Public Sector LiDAR datasets (DSM, DTM, LAZ) from the Registry of Open Data on AWS. Supports all survey phases (1-5) and Outer Hebrides, OS National Grid square filtering, paginated S3 listing, streamed downloads with resume support, and dry-run mode. No external dependencies. Uses only Ruby stdlib (net/http, uri, fileutils). If this gem saves you time, consider buying Sebastian a coffee at https://buymeacoffee.com/smadrid