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KML and KMZ

KML is the native exchange language of Google Earth. KMZ is a compressed package that can bundle KML with images/icons and related resources.

Good uses​

  • place-based tours
  • simple placemarks and polygons
  • a map for someone without GIS software
  • historical image ground overlays
  • folders organised by theme or time

Coordinate system​

KML uses longitude/latitude coordinates associated with WGS84. Export correctly defined NZTM layers through GIS software rather than rewriting coordinates manually.

Not a master GIS database​

KML can simplify field names, styling and data types. It is excellent for communication, not a replacement for the source GeoPackage/geodatabase.

Sensitive precision​

If a Google Earth product should show a generalised place rather than the precise working geometry, create a separate derived layer before export instead of assuming KML will hide detail.

See Google Earth and Cartography.

Last reviewed: 26 August 2026

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