> For the complete documentation index, see [llms.txt](https://docs.seasketch.org/seasketch-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.seasketch.org/seasketch-documentation/administrators-guide/overlay-layers.md).

# Overlay Layers

Overlay Layers refers to any data layer not include in a [Basemap](/seasketch-documentation/administrators-guide/basemaps-maps.md). SeaSketch supports [directly uploading spatial data](/seasketch-documentation/administrators-guide/overlay-layers/uploading-spatial-data.md) in SeaSketch, as well as data from remote web services. It also supports managing [layer metadata](/seasketch-documentation/administrators-guide/overlay-layers/metadata-and-attribution.md), updating and [tracking data versions](/seasketch-documentation/administrators-guide/overlay-layers/uploading-spatial-data.md#managing-new-versions-of-a-dataset), includes [advanced cartography tools](/seasketch-documentation/administrators-guide/overlay-layers/cartographic-styling.md), and numerous [interactivity options](/seasketch-documentation/administrators-guide/overlay-layers/interactivity-and-popups.md).

We aim for SeaSketch to provide a complete data portal solution in a single tool, using the latest technology to make data viewing and management fast and intuitive. Anyone can using SeaSketch to support marine conservation planning can create a project, and each include 10 GB of free data hosting.