0 views collected around this technical thread.
This article traces the evolution of open source GIS from its early roots in MOSS and GRASS through key projects like GeoTools, GDAL, PostGIS, and GeoServer, and then details the components and typical open‑source stack of a modern WebGIS solution.
The Travel Time Index (TTI) quantifies urban congestion by comparing actual travel time to free‑flow conditions, and this study details domestic and international evaluation methods, free‑flow speed estimation, weight calculation, link extraction via PostGIS, system architecture, and validation using massive Didi trajectory data to support city traffic management.
On August 4 2018, Didi Open Source and the Open Source Database Forum hosted a salon where five industry experts presented the latest advances in open‑source databases—covering Redis multi‑data‑center deployment, MySQL InnoDB Cluster, streaming‑processing architecture, PostGIS GIS solutions, and Redis 5.0 features—followed by a Q&A, a prize draw, and a showcase of Didi’s growing open‑source portfolio.