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KML vs KMZ: Which Google Earth File to Use?

Two common file types that you will frequently come across when using Google Earth or GIS apps are KML (Keyhole Markup Language) and KMZ (Keyhole Markup Language Zipped). While both are necessary for geographic data storage and exchange, understanding when to use each helps enhance mapping workflow efficiency, compatibility, and performance.


KML vs KMZ
KML vs KMZ

What is a KML File?


In Google Earth, Google Maps, and other geospatial applications, geographic data is represented as KML files, which are XML-based files. It describes things like:


  • Points (GPS locations, landmarks)

  • Lines (paths, borders, and routes)

  • Areas and regions are polygons.

  • Overlays (pictures, 3D models, and icons)


A KML file may be modified in a text editor and is readable by humans because it is plain text. This makes it a suitable option if you need flexibility and openness while making changes to geospatial data.


Benefits of KML:


  • Simple to read and make manual edits

  • Extensively compatible with mapping and GIS tools

  • Perfect for datasets that are light in weight


KML's drawbacks


  • Greater file size than KMZ

  • Complex datasets with embedded graphics or icons load more slowly.


What is a KMZ File?


In essence, a KMZ file is a compressed (zipped) KML file. It can store relevant resources, such as textures, photos, icons, or 3D models, inside a single package in addition to the KML.


For example, saving the file as a KMZ bundle, everything together, if you add custom markers or picture overlays in Google Earth. This guarantees that others will view the same map design without any missing resources when you share the file.


Benefits of KMZ:


  • File size reduction (zipped compression)

  • Combines all necessary files into a single package.

  • Quicker to load and share than raw KML.


Drawbacks of KMZ


  • More difficult to manually change (needs unzipping)

  • Slightly less transparent for debugging than KML


KML vs KMZ: Key Differences

Feature

KML

KMZ

File Format

XML-based text

Zipped KML + resources

Size

Larger, uncompressed

Smaller, compressed

Editability

Easy to edit manually

Must unzip first

Sharing

May require sending multiple files

Single bundled file

Best For

Simple, lightweight datasets

Complex datasets with images/models


When to Use KML vs KMZ


Select KML if


  • You require a basic text document that can be edited.

  • Small datasets (points, routes, and polygons) are what you're working with.

  • Manual editing and transparency are crucial.


Select KMZ if


  • You are sharing data that has 3D models or embedded photos.

  • Reducing file size is necessary for quicker sharing.

  • Everything should be in a single, portable package.


For Google Earth and geospatial operations, KML and KMZ are also essential. KML is a superior choice if simplicity and editability are your top priorities. KMZ is the best option if you require portability, compression, and bundled resources.


KML is still helpful for transparency and light editing, but KMZ is more beneficial for the majority of real-world applications, particularly when sharing with others.


For more information or any questions regarding the KML and KMZ, please don't hesitate to contact us at


USA (HQ): (720) 702–4849


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