> 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/1-250-000-scale-colour-raster/1-250-000-scale-colour-raster-overview/product-supply.md). # Product supply ## Available formats for the 1:250 000Colour Raster Map product The 1:250 000 Scale Colour Raster product is available as **TIFF LZW** (Lempel Ziv Welch), a lossless compression (see the [data compression page](/os-downloads/products/maps-and-imagery-portfolio/maps-and-imagery-fundamentals/maps-and-imagery-products-overview/data-compression.md) for additional details). ## Product supply mechanism The GeoTIFF LZW compressed format is supplied as an online download which is available from the [OS Data Hub](https://osdatahub.os.uk/). Other TIFF formats are also available from the OS Data Hub but as area of interest (AOI) downloads only (i.e. not as full supply). OS Partners can select a Full Supply option or a Change-Only Update (COU) option. Public Sector Geospatial Agreement (PSGA) customers are only able to select the COU option. If you select the COU option, then you will only receive tiles that have changed since the previous supply. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.os.uk/os-downloads/products/maps-and-imagery-portfolio/1-250-000-scale-colour-raster/1-250-000-scale-colour-raster-overview/product-supply.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.