Convert KML to PMTiles
Use this tool to convert KML to PMTiles with various options such as Geometry Type, Projections, Line separator, etc.
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What is KML?
A KML (Keyhole Markup Language) file is an XML-based file format used for representing geographic data in three-dimensional earth browsers, such as Google Earth, Google Maps, and various GIS software. KML files can contain a variety of spatial data types, including points, lines, polygons, images, and text annotations, allowing users to visualize and interact with geospatial information.
Here's a breakdown of the key components typically found in a KML file:
- Document Structure: The root element of a KML file is <kml> which contains the <Document> element. Inside the <Document> element, you can include various elements representing geographical features.
- Geographical Features: KML supports different types of geographical features such as:
- <Placemark>: Represents a single point, line, or polygon feature.
- <Point>: Represents a single point.
- <LineString>: Represents a sequence of connected line segments.
- <Polygon>: Represents a closed shape with three or more sides.
- <GroundOverlay>: Represents an image overlay draped onto the ground.
- <ScreenOverlay>: Represents an image overlay fixed to the screen.
- <NetworkLink>: Allows the inclusion of content from the web.
- Styling: KML allows styling of features using <Style> elements. Styles can define attributes such as color, line width, and icon images.
- Metadata: KML files can contain metadata such as name, description, and custom properties associated with each feature.
- Hierarchy: KML files can be organized in a hierarchical structure. Features can be grouped within folders using the <Folder> element.
Overall, a KML file provides a structured way to represent geographic data along with associated metadata and styling information, making it widely used for sharing and visualizing spatial information across different platforms and applications.
What is PMTiles?
A PMTiles (Portable Map Tiles) file is a format for storing map tiles in a single file, making it easier to distribute and use maps offline or in environments with limited connectivity. It's a self-contained package that includes all the necessary tiles and metadata for rendering a map.
Here's a breakdown of what a PMTiles file typically contains:
- Map Tiles: PMTiles files store pre-rendered map tiles at various zoom levels and tile coordinates. These tiles are usually in standard web mapping formats like PNG or JPEG.
- Metadata: PMTiles files often include metadata describing the map, such as its name, description, attribution, and bounds.
- Tile Structure: The tiles are organized in a hierarchical structure based on zoom levels and tile coordinates. This structure allows efficient retrieval of tiles for rendering maps at different zoom levels and locations.
- Tile Index: PMTiles files may include an index or directory structure that allows quick lookup of tiles based on their zoom levels and coordinates.
- Compression: To reduce file size, PMTiles files may use compression techniques such as gzip or deflate.
- Compatibility: PMTiles files are designed to be compatible with various mapping libraries and applications that support tiled maps, such as OpenLayers, Leaflet, and Mapbox GL.
Overall, PMTiles files provide a convenient way to package and distribute map tiles, making it easier to deploy maps in offline or resource-constrained environments. They are commonly used for mobile applications, offline mapping, and sharing custom map styles and data.