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

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

Geometric Network Simulator

spatial data selection queries and nearest neighbor search for Beijing restaurants

A framework for the efficient representation and analysis of triangulated terrains

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

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

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

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

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