Map skills: grid references, scale, contours and direction

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Reading Ordnance Survey maps

Eastings label vertical north–south lines, with values increasing eastward. Northings label horizontal east–west lines, with values increasing northward. Always give the easting before the northing. The memory aid across then up refers to how the values increase, not to the orientation of the lines.
A four-figure reference identifies a 1 km square by its west and south grid lines. In the exact grid example, the upper point lies in 3427. Subdivide mentally into tenths: five tenths east and eight tenths north give 345278. This six-figure convention identifies a 100 m square, not an infinitely precise point. Preserve leading zeros and include the National Grid’s two-letter 100 km prefix for a full unambiguous reference.
Scale ratios compare equal units. At 1:50,000, 1 cm = 500 m; at 1:25,000, 1 cm = 250 m. Trace bends with thread or short paper-edge segments and total the length. These are plan-view ground distances: actual surface travel can be longer on slopes. A graphic scale remains useful when resized with its map; the original printed ratio no longer applies to centimetres on a resized display.
A bearing is measured clockwise from a stated north at the starting point, using three digits. North is 000°, east 090°, south 180° and west 270°. A reverse bearing differs by 180°, reduced to the 000°–359° range. Distinguish grid, true and magnetic north.

Invented kilometre grid

Relief

Contours join equal elevations above a stated datum. Read the interval: a pair of adjacent contours might differ by 5 or 10 m, depending on the map. Compare spacing only with the same scale and vertical interval. Closely spaced contours then indicate a steeper slope, while wide spacing indicates a gentler slope.
The attached image is an unlabelled conceptual comparison of a hill, valley and ridge, not a real survey. Closed contours can indicate a hill when heights increase inward; depression symbols or values can instead indicate a hollow. Valley bends point uphill or upstream; ridge bends project downhill. Verify with height labels rather than shape alone.
A spot height records elevation at a surveyed point with the map’s stated precision and datum. A triangulation pillar is a survey station historically used to measure angles; it need not stand on a summit. Gradient uses vertical rise divided by horizontal distance: 60 m over 300 m gives 60:300 = 1:5.
To construct a cross-section, mark every contour intersection along the chosen transect with its elevation. Transfer the positions to a distance axis and heights to a stated vertical scale, then draw a sensible profile. If vertical and horizontal scales differ, the relief is exaggerated; do not invent detailed shape between observations.

Conceptual hill, valley and ridge

Symbols and land use

Check the specific map legend. Watercourse symbols are normally blue, woodland is generally green with tree symbols and contours are commonly brown. Blue can also mark grid lines or motorways; road classes have different colours and styles, and rights-of-way colours differ between OS products.
Combine symbols, pattern and context to describe land use. Tree symbols support woodland, field boundaries and farm labels can support agricultural use, and building symbols indicate structures. Do not claim a precise activity from colour alone or confuse a route’s legal status with its physical surface.

Settlement patterns

Nucleated and clustered are synonyms for a compact concentration around a focus. Dispersed settlements have isolated or widely separated buildings. Linear settlements follow an elongated route or feature, such as a road, river or coastline. Real places can combine patterns.
Use the invented plan illustration to compare distribution rather than to infer population or a named place. Local site concerns the ground occupied, such as a terrace; situation concerns wider routes, neighbouring towns and resources. A crossing may attract movement and trade, but the explanation needs evidence.

Invented settlement patterns

Describing routes and areas

Describe the route with its starting point, direction changes, grid references, measured distances and land use. Identify climbs or descents from labelled contours and heights. Use the key to recognise crossings, path types and barriers.
Support explanations with map evidence and qualify inference. A bridge and converging routes may help explain a settlement focus; they do not prove its historical origin on their own. Do not assume the straight-line route is the shortest usable route or that a public route is safe in all conditions.

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Übungsfragen

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1.What colour shows water on an OS map?
Easy
- Ablue
- Bgreen
- Cbrown
- Dblack
2.What colour shows woodland?
Easy
- Ablue
- Bred
- Cbrown
- Dgreen
3.What are contour lines?
Easy
- Arivers
- Brailways
- Clines joining points of equal height
- Droads
4.What are eastings?
Easy
- Aroads
- Bvertical grid lines numbered left to right
- Chorizontal lines
- Dcontours
5.What are northings?
Easy
- Ahorizontal grid lines numbered upward
- Bvertical lines
- Ccontours
- Drivers
6.How many numerical digits are in an OS six-figure grid reference, excluding its two-letter National Grid prefix?
Easy
- Afour
- Beight
- Ctwo
- Dsix
7.What does 1:50 000 mean?
Easy
- A1 cm is 5 km
- Bnone
- C1 cm on the map is 50,000 cm on the ground
- D1 cm is 50 cm
8.On a 1:50 000 map, 3 cm represents:
Easy
- A150 m
- B1.5 km
- C3 km
- D15 km

Mehr Fragen

9.On a 1:25 000 map, 4 cm represents:
Easy
- A1 km
- B4 km
- C2 km
- D100 m
10.What is a trig point?
Easy
- Aa river
- Ba road
- Ca railway
- Da survey station historically used for triangulation
11.What is a nucleated settlement?
Easy
- Abuildings along a road
- Bno buildings
- Cbuildings clustered around a centre
- Dscattered buildings
12.Which description best defines a linear settlement?
Medium
- Aland with no buildings
- Ban elongated ribbon of buildings following a route or physical feature
- Cisolated buildings scattered without a main line or central cluster
- Da compact cluster around a central focus
13.What shape do contours make where a valley runs?
Medium
- AV-shapes pointing uphill
- Bcircles
- Cstraight lines
- Dsquares
14.On the same map, with the same contour interval, which spacing represents the gentler slope: contours 5 mm apart or 1 mm apart?
Medium
- A1 mm apart
- Bthey are equal
- Ccannot tell
- D5 mm apart
15.What does a spot height give?
Medium
- Athe area of a field
- Bthe depth of a lake
- Cthe mapped elevation at a particular point
- Dthe length of a road
16.How can you measure a winding road on a map?
Medium
- Aignore it
- Bfollow bends in short measured segments with a paper edge, then use the scale
- Cguess
- Duse only a ruler straight
17.Why might a settlement be located at a river crossing?
Medium
- Aeasy to cross and trade
- Bto avoid water
- Cto avoid roads
- Dto flood
18.What is the 'site' of a settlement?
Medium
- Aits wider position
- Bits name
- Cits size
- Dthe exact location and local land
19.What is the 'situation' of a settlement?
Medium
- Aits name
- Bits colour
- Cits position in relation to surrounding areas
- Dits exact plot
20.Why can steep land be less suitable for mechanised arable farming?
Medium
- Ait is irrigated
- Bmachinery is harder to use safely and erosion risk can increase
- Cit is flat
- Dit is fertile
21.What are the ground dimensions of a standard kilometre grid square on an OS 1:50,000 map?
Easy
- A1 km by 1 km
- B1 m by 1 m
- C10 km by 10 km
- D100 m by 100 m
22.What is a bearing?
Easy
- Aa map scale
- Ba grid reference
- Ca contour
- Dan angle measured clockwise from a specified north at the starting point
23.Which comparable OS topographic map generally shows greater detail?
Medium
- Athey are equal
- Bcannot tell
- C1:25 000
- D1:50 000
24.What does a key do?
Medium
- Ashows north
- Bexplains map symbols
- Cshows scale only
- Dshows the title
25.Eastings come before northings in a grid reference.
Easy
True or false?
26.Close contour lines show a steep slope.
Easy
True or false?
27.1:50 000 means 1 cm on the map is 500 km.
Easy
True or false?
28.A linear settlement follows a road or river.
Easy
True or false?
29.Blue lines on an OS map always show woodland.
Medium
True or false?
30.Which are settlement patterns?
Medium
- Anucleated
- Bdispersed
- Clinear
- Dclustered
- Erelief
31.Which are common OS map conventions?
Medium
- Ablue watercourse symbols
- Bgreen woodland tint and tree symbols
- Cbrown contour lines
- Dseveral colours and line styles for different road classes
- Epurple shading for every land surface
32.Explain how to give a six-figure grid reference.
Medium
33.A feature lies in the kilometre square east of easting 34 and north of northing 27. What is the four-figure reference?
Medium
- A3427
- B2734
- C345278
- D3472
34.A point lies five tenths east of easting 34 and eight tenths north of northing 27. What is its six-figure reference?
Medium
- A278345
- B348275
- C342758
- D345278
35.A route rises 60 m over 300 m horizontal distance. In gradient form 1:n, what is n?
Medium
36.On an unresized 1:25,000 map a measured curved route is 6 cm long. What horizontal ground distance is this in kilometres?
Medium
37.On a north-up map, what clockwise bearing in degrees is due east from a starting point?
Medium

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