Land-Form PROFILE^® Plus demonstrator

We have developed this short demonstration to help you understand the new product.

Land-Form Profile Plus is a digital terrain model (DTM). The opening image in the demo shows the DTM overlaid with OS MasterMap Imagery Layer data, providing the context of the data. Land-Form Profile Plus is compatible with all of the other OS MasterMap layer products: Topography; Integrated Transport Network (ITN) and Address.

The demo is broken down into two main parts. Each contains a number of checkable headings as follows:

• Grid spacing – a visual explanation of what this means with a comparison between Land-Form Profile and Land-Form Profile Plus. The main difference being the increased number of points available in Land-Form Profile Plus.
• Grid schematic – a view of what the 'z' value could look like
• Hill shade modelling – again, a comparison between Land-Form Profile and Land-Form Profile Plus – what the DTM would look like if a giant cloth was draped over the 'posts' and then a shading applied to one side of a hill. The additional detail available in Land-Form Profile Plus is due entirely to the increased number of points-resolution.
• Land-Form   Profile Plus hill shade model with OS MasterMap Imagery layer. The benefit of adding further contextual data to see more of what is 'in the data'.

The flooding example

• Opens with OS MasterMap Topography Layer view of a village by river.
• The extent of flooding if the water level was to rise by 6.5 m.
• Identification of the properties at risk should water level rise by 6.5 m - the red polygons.
• By linking to OS MasterMap Address layer we can see the addresses of the properties that would be affected – the blue triangles. This could be used in an insurance environment to differentiate between properties that would be affected and those that would not. It could be used in more pertinent premium setting: Why penalise those properties that are unlikely to be affected with the same insurance premiums as those that are most likely to be affected?
• But what if the water level did rise?
• Roads liable to flooding – by linking with OS MasterMap ITN layer we can identify the roads that will be flooded. This leads to an understanding of roads inaccessible due to flooding (the lighter shade). In the event of such an occurrence this information would be vital for those responding to the event. It would show the access problems, and the evacuation issues.
• Finally, an animated view of what happens as the water levels rise. It is not a flood model, but gives an indication of how the water will get to the village. It would give an insight on how to protect the village from the threat of flood.

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