Planning zones at a location in Đà Nẵng or Ho Chi Minh City, or one zone by id. Pass query as 'latitude, longitude' (e.g. 10.7769, 106.7009), or id. Each zone has id, level (qh_chi_tiet detailed plan, qh_phan_khu zoning plan, qh_chung general plan), province, provinceName, commune, communeName, block (the plan's block code), landUse (the city's own plan code) with landUseName as written and zoneClass/zoneClassEn, purpose (HCMC: what the zone is for), area (stated, m²), mapArea, population (planned, HCMC), and HCMC's building rules: densityMin/Max (coverage %), farMin/Max (floor area ratio), floorsMin/Max, heightMin/Max (m). Empty fields are left out. A block that allows several uses is one zone: landUse is its main use, and uses lists the others (landUse, landUseName, zoneClass/zoneClassEn, and a rule pair where that use's rules differ from the zone's). Detailed plans come first; they apply where they exist. An empty result means no plan is loaded there (only Đà Nẵng and HCMC are).