WGS84

Use this skill for practical work with WGS 84 longitude/latitude coordinates.

WGS 84 usually refers to the global geographic reference system commonly exposed as EPSG:4326 in GIS software. It is the right default for GPS-style coordinate exchange, but it is not the right answer for every display or measurement workflow.

What This Skill Does

• Explain what WGS 84 is and when to use it.
• Validate longitude/latitude numeric ranges.
• Check whether a coordinate pair is likely lon,lat or lat,lon.
• Recommend a UTM zone and EPSG code for projected analysis.
• Flag when a coordinate falls inside mainland-China extents where GCJ-02 / BD-09 confusion is common.
• Recommend whether to keep WGS84, use Web Mercator for display, or switch to a projected CRS for analysis.
• Explain when to keep data in EPSG:4326 and when to reproject.
• Hand off file-based reprojection steps to qgis when execution is required.

Standard Workflow