# Product supply ## Available formats for Colour Raster Map products The following list outlines the formats available for the 1:25 000 Colour Raster Map product. * **TIFF LZW** (Lempel Ziv Welch) is 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)). * **TIFF PackBits** is a lossless compression scheme that is supported by virtually all applications that can import TIFF graphics. * **GeoTIFF LZW** is a TIFF file which has geographic (or cartographic) data embedded as tags within it. The geographic data can then be used to position the image in the correct location and with precise geometry on the screen of a geographic information display. ## TIFF information TIFF is a file-based format for storing and interchanging raster images, with the most recent version (6.0) published in 1992. There are two types of architecture for a TIFF. Many mainframe computers use what is known as a big endian (Motorola®) architecture. Most modern computers, including personal computers (PCs), use the little-endian (Intel®) system. 1:50 000 Scale Colour Raster and 1:25 000 Scale Colour Raster TIFFs are supplied with Intel architecture. Converting between these two systems is possible but, as a general rule, modern software should be expected to handle both of these outputs without operator intervention. Both the 1:25 000 and 1:50 000 Scale Colour Raster maps conform to the TIFF 6.0 standard. Customers are recommended to contact their system suppliers to ensure that it can read the Intel / little-endian TIFF architecture. ## 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). The TIFF LZW compressed and TIFF LZW 8-bit uncompressed formats are available for customers to request on DVD / HDD through [OS Orders](https://orders.ordnancesurvey.co.uk/sso/login.shtml). 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: 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: ``` GET https://docs.os.uk/os-downloads/products/maps-and-imagery-portfolio/1-25-000-scale-colour-raster/1-25-000-scale-colour-raster-overview/product-supply.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.