The practical playbook for building event-driven geospatial systems in Python.
Real-time feature changes, tile updates, and sensor payloads — routed, deduplicated, retried, and observed without losing data or double-writing features.

🌐 Read it live → www.geospatialwebhook.com

geospatialwebhook.com is a deep, production-focused reference for engineers who move spatial data through webhooks and event streams. Most event-driven material assumes tidy JSON payloads; spatial data is messier — coordinate reference systems drift, geometries are topologically equivalent but byte-different, GPS jitter breaks naive hashing, and a single million-vertex multipolygon can stall an event loop. This site covers the patterns that hold up under real production load, every one of them backed by runnable Python.

It is written for platform engineers, GIS backend developers, real-time spatial app builders, and SaaS founders who need pipelines that don't lose data, don't double-write features, and stay observable at scale.

The material is organised into five areas, each starting with architecture, then concrete Python implementations, then the operational hardening that separates a prototype from a platform:

• Core Event Fundamentals & Architecture — pub/sub with geographic partitioning, event sourcing for spatial state, sensor routing, tile-update pipelines, webhook security boundaries, and spatial partitioning strategies (H3 / S2 / Quadkey).
• Idempotency & Spatial Deduplication — deterministic key generation, cache-backed checks, tolerance-based spatial overlap detection, and conflict resolution for repeated events.
• Spatial Payload Routing & Parsing — CRS normalization (with EPSG codes), geometry validation, GeoJSON ⇄ Protobuf mapping, and async parsing of heavy geometries.
• Queue Management, Retries & Delivery Guarantees — exponential backoff with jitter, dead-letter queues that preserve geometry context, broker selection and partitioning, and delivery/ordering semantics.
• Monitoring & Observability for Spatial Pipelines — geo-specific Prometheus metrics, consumer-lag and partition-skew detection, structured logging, and OpenTelemetry tracing across async geometry handlers.

Highlights include head-to-head comparisons engineers actually search for — H3 vs S2 vs Quadkey, Redis Streams vs Kafka, and Protocol Buffers vs GeoJSON — plus webhook security depth on HMAC-SHA256 signing, IP allowlisting, and replay-attack prevention.

• Eleventy (11ty) static site generator — content authored in Markdown with Nunjucks templates.
• Hand-authored, theme-adaptive inline SVG diagrams; syntax-highlighted Python via Prism.
• Structured data (Article, BreadcrumbList, HowTo, FAQPage) on every page.
• Deployed to Cloudflare Pages.

npm install      # install dependencies
npm run build    # build the static site into _site/
npm run serve    # local dev server with live reload
npm run deploy    # build + deploy to Cloudflare Pages

All commits to this repository are made by the geospatialwebhook account only. Commits carry no co-author trailer and no other identities — a single, consistent author for the whole history.

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