OpenHuFu is an open-sourced data federation system to support collaborative queries over multi databases with security guarantee.

bring sf to spark in production

A Visual Spatial Query Language written in Common Lisp & CLIM for its GUI

DLMAPS = Description Logic Maps: Ontology-Based Spatial Queries to Digital City Maps

A focused Kotlin/Spring Boot module demonstrating spatial query patterns extracted from a production maritime platform

CSD-RkNN: Conic Section Discriminances for Large Scale Reverse k Nearest Neighbors Queries

From Planimetry to Graph - A First Step Towards the Implementation of an Efficient AED Program

A framework for the efficient representation and analysis of triangulated terrains

Geometric Network Simulator

Core API for CityFixes built with Java 21 and Spring Boot 3.5.9. Implementing Hexagonal Architecture (Ports & Adapters), DDD principles, and Spatial Queries (PostgreSQL) to manage urban infrastructure issues via a secure, stateless JWT-based system.

spatial data selection queries and nearest neighbor search for Beijing restaurants

Hotspot analysis on Big Data of a major taxi company using Apache Spark and Scala

In-depth guides to building production geospatial REST APIs with FastAPI & PostGIS — architecture, serialization, caching, security, and deployment. Source for www.geospatial-api.com.

R+-Tree with augmentations to support Textual-Spatial-Queries

Generate GeoAlchemy2 and SQLAlchemy 2.0 declarative models from a live PostGIS database, complete with geometry types, SRIDs, spatial indexes, enums and foreign-key relationships — plus typed spatial query helpers for ST_DWithin, KNN and bounding-box searches. Works from a live DSN or a shareable JSON schema description.

world-wide spatial search for airports, ports, train stations

Production-grade PostGIS + Python documentation: spatial queries, GiST indexing, SQLAlchemy/GeoAlchemy2 integration, schema migrations, and performance tuning — runnable SQL + Python, no pseudocode.

🗺️ Five simple utilities that implement spatial queries in two-dimensional space