v2 - Non-directed interstate graphSecond iteration was to pull interstate data from OpenStreetMaps (OSM) and build a non-directed graph of the interstates. First, the app latches you to the closest edge of the graph and then traverses the graph in your current direction of travel via Dijkstra's algorithm to find upcoming exits. When I found an exit, I would do a radial search for POIs.
The Apps Running Quietly in the Background
，这一点在新收录的资料中也有详细论述
The name of this file on disk is usually the name of the database file，推荐阅读新收录的资料获取更多信息
volunteers than they had space for.