wgs84
Explain and work with the WGS 84 coordinate system for GPS-style longitude/latitude data, including EPSG:4326 usage, axis-order checks, range validation, UTM zone recommendation, and reprojection planning. Use when the user asks about WGS84, EPSG:4326, GPS coordinates, 经纬度, 坐标校验, 轴顺序, UTM 分带, or WGS84 conversion guidance.