Ordnance Survey and English Heritage experts have spent the past few months identifying the original outline.
Mapping projects, such as Ordnance Survey maps, will also benefit from the project he said.
Lib Dem peer Baroness Maddock revealed that she relied on Ordnance Survey maps, despite technological advances.
"Clearly, the free availability of Ordnance Survey data is to be welcomed, " he said.
The shape was carved into the hills in the early 19th Century but has been gradually "degraded" over time, according to Ordnance Survey.
His project report titled: "A baseline study of Monmouth Beach's Ammonite Pavement" has already been published by the UK mapping agency, the Ordnance Survey.
Spelling of townlands has generated a large number of inquiries to the council, which had agreed to adopt spellings used on the Ordnance Survey map.
Ordnance Survey and English Heritage are helping to restore the horse ahead of the 2012 Olympics, when Weymouth and Portland will host the sailing events.
Also in the sale were some Ordnance Survey maps of the West Midlands which had been over-printed by the Nazis as part of Hitler's invasion plans.
The Tory former chancellor Lord Howe of Aberavon added: "It is well known that the Ordnance Survey is a world-class national mapping organisation and national treasure".
Thack Moor in the North Pennines, about 12 miles north of Penrith, is 2cm above the 609.6m (2, 000ft) mark that signifies mountain status by Ordnance Survey's (OS) definition.
BBC: Ordnance Survey confirms mountain status for Thack Moor
He affirmed the government's commitment to the Ordnance Survey, telling peers that its response to a consultation on its future funding would be published before the end of March.
Given that it often drizzles in Wales, it is a good idea to pick up a laminated map of the relevant area from the Ordnance Survey, Britain's state mapmaker.
The Ordnance Survey (OS) agreed to put Gwenllian on the map after a campaign by the society and consultation with groups such as the National Trust and Snowdonia National Park Authority.
At question time on 24 March 2010, Conservative peer the Earl of Selborne asked the government how it planned to ensure that the Ordnance Survey would be sustainable despite the shortfall of revenue caused by the move.
Open Data campaigners claim that ministers are keener than they should be to listen to managers at the Ordnance Survey, the Land Registry and the Met Office who want to charge for their data rather than make it free.
The project uses aerial photographs known as ortho-imagery to produce the maps, and is being delivered as a joint project between the Department of Agriculture and Rural Development and Land and Property Services (previously known as the Ordnance Survey of Northern Ireland).
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