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Using OS OnDemand WMS FAQs
- Can I get the OS MasterMap Topography Layer in raster format outside of OnDemand WMS?
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No. A web map service, serves information only as unintelligent images and does not provide vector data. OS MasterMap Topography Layer is used in OS OnDemand to provide large-scale topographic images.
- I am licensed to view 1: 10 000 Scale Colour Raster, 1: 10 000 Scale Black & White Raster and OS Street View, but only OS Street View is visible after selecting the layers.
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Requesting all three 1: 10 000 scale raster products (1: 10 000 Scale Colour Raster, 1: 10 000 Scale Black & White Raster and OS Street View) will result in slower response times and the service will default to show OS Street View. When viewing 1:10 000 scale raster products you should only select one at a time and you must select the product that is suitable for your application.
- I have requested all three 1:10 000 scale Raster products but the products are masked. How can I view them?
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If you do not have a licence for all three 1:10 000 scale raster products (1: 10 000 Scale Colour Raster, 1: 10 000 Scale Black & White Raster and OS Street View), but request all three, this will result in all the 1:10 000 scale products being masked until you de-select the product you are not licensed for.
- Why am I getting blue masking when I make a request in the service?
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If a blue mask is showing, this normally indicates that you are not licensed for the Ordnance Survey map data or the specific area you have requested.
- Why can I not see any maps of the Isle of Man at a more detailed level then 1:50 000 Scale Colour Raster? There is a blue mask shown.
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If a blue mask is shown, normally this would indicate that you are not licensed for the Ordnance Survey map data for this area (e.g. you do not hold the required PSMA or Framework Direct licence). In the case of the Isle of Man the intellectual property for these more detailed maps is held by the Isle of Man government and as such, Ordnance Survey does not have a licence to be able to serve these maps within OS OnDemand.
The following products are available for this area:
- GB Overview+,
- GB Overview,
- MiniScale®,
- 1:250 000 Scale Colour Raster,
- 1:50 000 Scale Colour Raster,
- Land-Form PANORAMA® DTM,
- Land-Form PANORAMA® Contours and
- Strategi®
- When using Strategi and Meridian2, the features from Strategi are overlaying on top of Meridian2 features. Why does this happen?
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Where two or more products are requested in one get-map-request, they are returned as a single image. If one or more of the requested products is a multi-layer vector product, then the text relating to each product will be present as above. It should be noted that there may be conflict between text occurring in different products. For products with licence masks, these masks will be applied directly after each of these products.
- Why do I not see lines, texts and points in the OSMasterMap Topography layer when they are being requested?
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This happens because the topographic areas are being rendered on top of the other requested layers thus concealing them from view when the image is generated within the service. In order to see all the components, the topographic area must be requested first followed by the others, so that these are drawn on top.
- I have requested multiple OS MasterMap layers one at a time and the response seems slow. Can I do anything to improve this?
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Requesting multiple OS MasterMap layers in parallel, will result in an overall faster response time than if multiple layers are treated as a single request.
Useful resources
- OS OnDemand compliant GIS software
- How to connect to OS OnDemand
- How to get the best out of OS OnDemand guide (PDF, bytes)
- How to get connected as a Developer, Licensed Partner or System Supplier
