https://www.yongjiexue.io/en/tags/gis/Recent content in GIS on Yongjie XueHugoen-USSat, 27 Dec 2025 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-clone/Sat, 27 Dec 2025 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-clone/How to instantly clone a massive PostgreSQL database without consuming extra storage? PostgreSQL 18 and XFS can spark some serious magic.https://www.yongjiexue.io/en/pg/geoip/Sat, 07 Jul 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/geoip/A common requirement in application development is GeoIP conversion - converting source IP addresses to geographic coordinates or administrative divisions (country-state-city-county-town-village)https://www.yongjiexue.io/en/pg/adcode-geodecode/Wed, 06 Jun 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/adcode-geodecode/How to efficiently solve the typical reverse geocoding problem: determining administrative regions based on user coordinates.https://www.yongjiexue.io/en/pg/knn-optimize/Wed, 06 Jun 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/knn-optimize/Ultimate optimization of KNN problems, from traditional relational design to PostGIS