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https://github.com/azaion/satellite-provider.git
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Oleksandr Bezdieniezhnykh
687d6bdd5b
Add per-source tile rows to support multi-provider imagery (Google Maps + future UAV). Migration 013 (transactional) introduces source/captured_at columns, backfills existing rows to (source='google_maps', captured_at=created_at), and replaces the 4-column unique index with a 5-column index that includes source. TileRepository: - ColumnList includes source + captured_at - GetByTileCoordinatesAsync returns most-recent row across sources (ORDER BY captured_at DESC, updated_at DESC, id DESC) - GetTilesByRegionAsync uses DISTINCT ON to pick the most-recent tile per cell, restoring caller-facing row order - Insert/Update upsert on the new 5-column conflict key TileSource enum lives in Common.Enums. Snake_case wire format (google_maps, uav) is enforced by a focused TileSourceTypeHandler because the generic ToLowerInvariant pattern would emit "googlemaps", violating contract v1.0.0. TileService stamps Source=GoogleMaps + CapturedAt=UtcNow on every new tile. Tile-storage contract is now frozen at v1.0.0. AC coverage 7/7. New unit + integration tests cover all ACs; existing 200 unit + 5 smoke tests preserved. Co-authored-by: Cursor <cursoragent@cursor.com>
43 lines
4.2 KiB
Markdown
43 lines
4.2 KiB
Markdown
# Glossary
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## Domain Terms
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| Term | Definition | Source |
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|------|-----------|--------|
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| Tile | A single satellite imagery square (typically 256×256 px) at a specific zoom level and coordinate | modules/services_tile_service.md |
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| Region | A square geographic area defined by center point and size in meters; the unit of work for batch tile downloads | modules/services_region_service.md |
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| Route | An ordered sequence of geographic waypoints with interpolated intermediate points | modules/services_route_service.md |
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| Route Point | A single lat/lon coordinate on a route; either "original" (user-provided waypoint) or "intermediate" (system-generated) | modules/dataaccess_models.md |
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| Geofence | A rectangular geographic boundary (NW + SE corners) used to filter which route points receive map tile coverage | components/05_route_management/description.md |
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| Zoom Level | Google Maps tile resolution level (1–20); higher = more detail, smaller ground coverage per tile | modules/common_configs.md |
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| Stitch | Compositing multiple tiles into a single larger image with optional markers/borders | modules/services_region_service.md |
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| Layer 1 | Historic name for satellite imagery from external providers (provider-agnostic; first implementation: Google Maps). Generalised in AZ-484 to one of N values of `Tile Source`; the term is retained for continuity with earlier docs and tickets. | user clarification, AZ-484 |
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| Layer 2 | Historic name for UAV-captured nadir camera imagery (orthogonal tiles uploaded post-flight). Generalised in AZ-484 to the `uav` `Tile Source` value; the term is retained for continuity with earlier docs and tickets. | user clarification, AZ-484 |
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| Tile Source | The producer of a tile row, persisted in `tiles.source` as a contract-defined string (`google_maps`, `uav`, …). Each cell may have at most one row per source; reads return the most-recent across sources. Adding a new source requires a new `TileSource` enum member and a tile-storage contract version bump. | _docs/02_document/contracts/data-access/tile-storage.md (v1.0.0) |
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| Captured At | Producer-defined UTC timestamp ("the moment this tile imagery represents") persisted in `tiles.captured_at`. For Google Maps it is `DateTime.UtcNow` at download time (provider does not expose original imagery date); for UAV it is the capture timestamp supplied by the upload client. Drives the most-recent-across-sources read selection rule. | _docs/02_document/contracts/data-access/tile-storage.md (v1.0.0) |
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| Nadir Camera | Downward-facing camera on a UAV capturing ground imagery during flight | user clarification |
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| GPS-Denied Service | The consuming system: a UAV navigation service operating without GPS, using satellite/UAV imagery for positioning | user clarification |
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| Slippy Map Coordinates | Tile X/Y indices in the Web Mercator projection grid (standard for web map tile servers) | data_model.md |
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| Version | Integer year (e.g., 2025) used to invalidate tile cache when Google Maps imagery is updated | data_model.md |
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## Technical Terms
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| Term | Definition | Source |
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|------|-----------|--------|
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| Region Request Queue | In-process bounded `Channel<Guid>` that decouples HTTP request submission from background processing | modules/services_region_request_queue.md |
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| Session Token | Provider-specific authentication token (e.g., Google Maps) embedded in tile download URLs; each provider may use different auth mechanisms | modules/services_google_maps_downloader.md |
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| ISatelliteDownloader | Interface abstracting satellite imagery providers; first implementation: Google Maps (GoogleMapsDownloaderV2) | modules/common_interfaces.md |
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| DbUp | .NET library for forward-only SQL schema migrations via numbered embedded scripts | modules/dataaccess_database_migrator.md |
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| Tile Deduplication | Mechanism using DB unique index + ConcurrentDictionary to prevent re-downloading identical tiles | modules/services_google_maps_downloader.md |
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## Abbreviations
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| Abbrev | Meaning |
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|--------|---------|
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| MGRS | Military Grid Reference System (endpoint planned, currently stub) |
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| UAV | Unmanned Aerial Vehicle |
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| NFR | Non-Functional Requirement |
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| DI | Dependency Injection |
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| DTO | Data Transfer Object |
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| CSV | Comma-Separated Values (tile manifest output format) |
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