> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/maps-and-imagery-portfolio/maps-and-imagery-fundamentals/maps-and-imagery-products-technical-specification.md).

# Maps and Imagery Products Technical Specification

This technical specification provides technical information relating to Maps and Imagery products.

## Index

The following pages contain general information relating to Maps and Imagery products:

* [Georeferencing information](/os-downloads/products/maps-and-imagery-portfolio/maps-and-imagery-fundamentals/maps-and-imagery-products-technical-specification/georeferencing.md)
* [Image file directory entries](/os-downloads/products/maps-and-imagery-portfolio/maps-and-imagery-fundamentals/maps-and-imagery-products-technical-specification/image-file-directory-tiff.md)
* [Abbreviations used on OS 1:25 000 and 1:50 000 scale mapping](/os-downloads/products/maps-and-imagery-portfolio/maps-and-imagery-fundamentals/maps-and-imagery-products-technical-specification/abbreviations-used-on-os-1-25-000-and-1-50-000-scale-mapping.md)
* [Product glossary](/os-downloads/products/maps-and-imagery-portfolio/maps-and-imagery-fundamentals/maps-and-imagery-products-technical-specification/product-glossary.md)

Detailed information relating to each individual product's specification can be found in the following pages:

* [1:25 000 Scale Colour Raster Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/1-25-000-scale-colour-raster/1-25-000-scale-colour-raster-technical-specification.md)
* [1:50 000 Scale Colour Raster Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/1-50-000-scale-colour-raster/1-50-000-scale-colour-raster-technical-specification.md)
* [1:250 000 Scale Colour Raster Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/1-250-000-scale-colour-raster/1-250-000-scale-colour-raster-technical-specification.md)
* [GB Overview Maps Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/gb-overview-maps/gb-overview-maps-technical-specification.md)
* [MiniScale Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/miniscale/miniscale-technical-specification.md)
* [OS Open Zoomstack Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/os-open-zoomstack/os-open-zoomstack-technical-specification.md)
* [OS OpenMap – Local Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/os-openmap-local/os-openmap-local-technical-specification.md)
* [OS VectorMap District Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/os-vectormap-district/os-vectormap-district-technical-specification.md)
* [OS VectorMap Local Technical Specification](/os-downloads/products/maps-and-imagery-portfolio/os-vectormap-local/os-vectormap-local-technical-specification.md)


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