This means that 10cm on the map is the equivalent to 2,500m or 2.5km in real life. Step 3: Convert to kilometres by dividing by 1,000. Step 2: Convert to metres by dividing by 100. Step 1: Convert to centimetres by multiplying the distance you measured by the scale on the map. If the map scale is 1:25000, we could first work out the length in cm, then convert to metres or kilometres. The National Mapping Agreement which was launched in January 2017 providing Government Departments and Public Sector Bodies with unrestricted access to most of Ordnance Survey Ireland’s (OSi) geospatial data. OSGB36 is what might be termed a traditional datum. MapGenie and the National Mapping Agreement. If we measured a road on the map and discovered that it was 10cm, we could then calculate its real length using the scale. All mapping in Great Britain is in the OSGB36 National Grid coordinate reference system, and heights are above mean sea level defined at Newlyn in Cornwall Ordnance Datum Newlyn (ODN). Step 5 - either hold the paper against the scale bar at the bottom of the map or measure it to work out the distance. Step 4 - pivot the paper until you get to the end point. This map shows Historic Environment Record (HER) information and. Step 3 - every time the route curves, pivot (turn) the paper to continue to follow the route and make another mark. Please enter a postcode, street name, town or grid reference (e.g. These are the most detailed leisure maps that Ordnance Survey publish and cover all types of footpaths and most details of the countryside for easy navigation. Step 2 - place the paper on the map and make a mark at the start of the route. Maps and Grid Reference Ordnance Survey (OS) is the national mapping agency for Great Britain and is one of the worlds largest producers of maps. Step 1 - mark on the map the route you wish to measure. To measure a road that is not straight, lay a piece of string along the route or use a piece of paper to work out the distance. An easy way to remember this is that you always have to go along the corridor (eastings) before you go up the stairs (northings). For example, if the easting is 47 and the northing is 33, the grid reference is 47 33.Īlways write down the eastings first and then the northings. These are the most detailed leisure maps that Ordnance Survey publish and cover all types of footpaths and most details of the countryside. When put together, these two sets of numbers give the four-figure grid reference. What is the Ordnance Survey Maps and Grid Reference Ordnance Survey (OS) is the national mapping agency for Great Britain and is one of the world's largest producers of maps. Step 3 - Combine this number with the original number. Step 2 - Follow the northings (the horizontal lines) from the bottom of the map up until you find the same corner and make a note of this number, eg 33. Step 1 - Start at the left hand side of the map and follow the eastings (the vertical lines) along until you come to the bottom left-hand corner of the square you are looking for. Here are the steps you should follow to produce a four-figure grid reference: This gives you the grid reference of the square.
This is done by reading the numbers from the eastings and northings. A grid reference is a useful tool for identifying any square on a map.
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