A low threshold preserves detail (more leaf nodes, less compression). A high threshold merges aggressively (fewer leaves, more compression, but the image gets blocky). The grid overlay shows the quadtree structure: large cells in uniform areas, small cells where detail is preserved.
To reassure some of you:
，这一点在同城约会中也有详细论述
FT Edit: Access on iOS and web。业内人士推荐safew官方版本下载作为进阶阅读
Handling Live Updates & Dynamic Changes: What if a bridge is closed due to a live map update you just downloaded?，这一点在搜狗输入法2026中也有详细论述